/* reading patches */ /* $Id: pch.c,v 1.44 2003/05/20 14:03:17 eggert Exp $ */ /* Copyright (C) 1986, 1987, 1988 Larry Wall Copyright (C) 1990, 1991, 1992, 1993, 1997, 1998, 1999, 2000, 2001, 2002, 2003 Free Software Foundation, Inc. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; see the file COPYING. If not, write to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ #define XTERN extern #include #include #include #include #include #include #undef XTERN #define XTERN #include #define INITHUNKMAX 125 /* initial dynamic allocation size */ /* Patch (diff listing) abstract type. */ static FILE *pfp; /* patch file pointer */ static int p_says_nonexistent[2]; /* [0] for old file, [1] for new: 0 for existent and nonempty, 1 for existent and probably (but not necessarily) empty, 2 for nonexistent */ static int p_rfc934_nesting; /* RFC 934 nesting level */ static time_t p_timestamp[2]; /* timestamps in patch headers */ static off_t p_filesize; /* size of the patch file */ static LINENUM p_first; /* 1st line number */ static LINENUM p_newfirst; /* 1st line number of replacement */ static LINENUM p_ptrn_lines; /* # lines in pattern */ static LINENUM p_repl_lines; /* # lines in replacement text */ static LINENUM p_end = -1; /* last line in hunk */ static LINENUM p_max; /* max allowed value of p_end */ static LINENUM p_prefix_context; /* # of prefix context lines */ static LINENUM p_suffix_context; /* # of suffix context lines */ static LINENUM p_input_line; /* current line # from patch file */ static char **p_line; /* the text of the hunk */ static size_t *p_len; /* line length including \n if any */ static char *p_Char; /* +, -, and ! */ static LINENUM hunkmax = INITHUNKMAX; /* size of above arrays */ static int p_indent; /* indent to patch */ static bool p_strip_trailing_cr; /* true if stripping trailing \r */ static bool p_pass_comments_through; /* true if not ignoring # lines */ static file_offset p_base; /* where to intuit this time */ static LINENUM p_bline; /* line # of p_base */ static file_offset p_start; /* where intuit found a patch */ static LINENUM p_sline; /* and the line number for it */ static LINENUM p_hunk_beg; /* line number of current hunk */ static LINENUM p_efake = -1; /* end of faked up lines--don't free */ static LINENUM p_bfake = -1; /* beg of faked up lines */ enum nametype { OLD, NEW, INDEX, NONE }; static char *scan_linenum (char *, LINENUM *); static enum diff intuit_diff_type (void); static enum nametype best_name (char * const *, int const *); static int prefix_components (char *, bool); static size_t pget_line (int, int, bool, bool); static size_t get_line (void); static bool incomplete_line (void); static bool grow_hunkmax (void); static void malformed (void) __attribute__ ((noreturn)); static void next_intuit_at (file_offset, LINENUM); static void skip_to (file_offset, LINENUM); static char get_ed_command_letter (char const *); /* Prepare to look for the next patch in the patch file. */ void re_patch (void) { p_first = 0; p_newfirst = 0; p_ptrn_lines = 0; p_repl_lines = 0; p_end = -1; p_max = 0; p_indent = 0; p_strip_trailing_cr = false; } /* Open the patch file at the beginning of time. */ void open_patch_file (char const *filename) { file_offset file_pos = 0; struct stat st; if (!filename || !*filename || strEQ (filename, "-")) { file_offset stdin_pos; #if HAVE_SETMODE_DOS if (binary_transput) { if (isatty (STDIN_FILENO)) fatal ("cannot read binary data from tty on this platform"); setmode (STDIN_FILENO, O_BINARY); } #endif if (fstat (STDIN_FILENO, &st) != 0) pfatal ("fstat"); if (S_ISREG (st.st_mode) && (stdin_pos = file_tell (stdin)) != -1) { pfp = stdin; file_pos = stdin_pos; } else { size_t charsread; int exclusive = TMPPATNAME_needs_removal ? 0 : O_EXCL; TMPPATNAME_needs_removal = 1; pfp = fdopen (create_file (TMPPATNAME, O_RDWR | O_BINARY | exclusive, (mode_t) 0), "w+b"); if (!pfp) pfatal ("Can't open stream for file %s", quotearg (TMPPATNAME)); for (st.st_size = 0; (charsread = fread (buf, 1, bufsize, stdin)) != 0; st.st_size += charsread) if (fwrite (buf, 1, charsread, pfp) != charsread) write_fatal (); if (ferror (stdin) || fclose (stdin) != 0) read_fatal (); if (fflush (pfp) != 0 || file_seek (pfp, (file_offset) 0, SEEK_SET) != 0) write_fatal (); } } else { pfp = fopen (filename, binary_transput ? "rb" : "r"); if (!pfp) pfatal ("Can't open patch file %s", quotearg (filename)); if (fstat (fileno (pfp), &st) != 0) pfatal ("fstat"); } p_filesize = st.st_size; if (p_filesize != (file_offset) p_filesize) fatal ("patch file is too long"); next_intuit_at (file_pos, (LINENUM) 1); set_hunkmax(); } /* Make sure our dynamically realloced tables are malloced to begin with. */ void set_hunkmax (void) { if (!p_line) p_line = (char **) malloc (hunkmax * sizeof *p_line); if (!p_len) p_len = (size_t *) malloc (hunkmax * sizeof *p_len); if (!p_Char) p_Char = malloc (hunkmax * sizeof *p_Char); } /* Enlarge the arrays containing the current hunk of patch. */ static bool grow_hunkmax (void) { hunkmax *= 2; assert (p_line && p_len && p_Char); if ((p_line = (char **) realloc (p_line, hunkmax * sizeof (*p_line))) && (p_len = (size_t *) realloc (p_len, hunkmax * sizeof (*p_len))) && (p_Char = realloc (p_Char, hunkmax * sizeof (*p_Char)))) return true; if (!using_plan_a) memory_fatal (); /* Don't free previous values of p_line etc., since some broken implementations free them for us. Whatever is null will be allocated again from within plan_a (), of all places. */ return false; } /* True if the remainder of the patch file contains a diff of some sort. */ bool there_is_another_patch (void) { if (p_base != 0 && p_base >= p_filesize) { if (verbosity == VERBOSE) say ("done\n"); return false; } if (verbosity == VERBOSE) say ("Hmm..."); diff_type = intuit_diff_type(); if (diff_type == NO_DIFF) { if (verbosity == VERBOSE) say (p_base ? " Ignoring the trailing garbage.\ndone\n" : " I can't seem to find a patch in there anywhere.\n"); if (! p_base && p_filesize) fatal ("Only garbage was found in the patch input."); return false; } if (skip_rest_of_patch) { Fseek (pfp, p_start, SEEK_SET); p_input_line = p_sline - 1; return true; } if (verbosity == VERBOSE) say (" %sooks like %s to me...\n", (p_base == 0 ? "L" : "The next patch l"), diff_type == UNI_DIFF ? "a unified diff" : diff_type == CONTEXT_DIFF ? "a context diff" : diff_type == NEW_CONTEXT_DIFF ? "a new-style context diff" : diff_type == NORMAL_DIFF ? "a normal diff" : "an ed script" ); if (verbosity != SILENT) { if (p_indent) say ("(Patch is indented %d space%s.)\n", p_indent, p_indent==1?"":"s"); if (p_strip_trailing_cr) say ("(Stripping trailing CRs from patch.)\n"); if (! inname) { char numbuf[LINENUM_LENGTH_BOUND + 1]; say ("can't find file to patch at input line %s\n", format_linenum (numbuf, p_sline)); if (diff_type != ED_DIFF) say (strippath == -1 ? "Perhaps you should have used the -p or --strip option?\n" : "Perhaps you used the wrong -p or --strip option?\n"); } } skip_to(p_start,p_sline); while (!inname) { if (force | batch) { say ("No file to patch. Skipping patch.\n"); skip_rest_of_patch = true; return true; } ask ("File to patch: "); inname = fetchname (buf, 0, (time_t *) 0); if (inname) { if (stat (inname, &instat) == 0) { inerrno = 0; invc = -1; } else { perror (inname); fflush (stderr); free (inname); inname = 0; } } if (!inname) { ask ("Skip this patch? [y] "); if (*buf != 'n') { if (verbosity != SILENT) say ("Skipping patch.\n"); skip_rest_of_patch = true; return true; } } } return true; } /* Determine what kind of diff is in the remaining part of the patch file. */ static enum diff intuit_diff_type (void) { register file_offset this_line = 0; register file_offset first_command_line = -1; char first_ed_command_letter = 0; LINENUM fcl_line = 0; /* Pacify `gcc -W'. */ register bool this_is_a_command = false; register bool stars_this_line = false; enum nametype i; char *name[3]; struct stat st[3]; int stat_errno[3]; int version_controlled[3]; register enum diff retval; name[OLD] = name[NEW] = name[INDEX] = 0; version_controlled[OLD] = -1; version_controlled[NEW] = -1; version_controlled[INDEX] = -1; p_rfc934_nesting = 0; p_timestamp[OLD] = p_timestamp[NEW] = (time_t) -1; p_says_nonexistent[OLD] = p_says_nonexistent[NEW] = 0; Fseek (pfp, p_base, SEEK_SET); p_input_line = p_bline - 1; for (;;) { register char *s; register char *t; register file_offset previous_line = this_line; register bool last_line_was_command = this_is_a_command; register bool stars_last_line = stars_this_line; register int indent = 0; char ed_command_letter; bool strip_trailing_cr; size_t chars_read; this_line = file_tell (pfp); chars_read = pget_line (0, 0, false, false); if (chars_read == (size_t) -1) memory_fatal (); if (! chars_read) { if (first_ed_command_letter) { /* nothing but deletes!? */ p_start = first_command_line; p_sline = fcl_line; retval = ED_DIFF; goto scan_exit; } else { p_start = this_line; p_sline = p_input_line; return NO_DIFF; } } strip_trailing_cr = 2 <= chars_read && buf[chars_read - 2] == '\r'; for (s = buf; *s == ' ' || *s == '\t' || *s == 'X'; s++) { if (*s == '\t') indent = (indent + 8) & ~7; else indent++; } for (t = s; ISDIGIT (*t) || *t == ','; t++) continue; this_is_a_command = (ISDIGIT (*s) && (*t == 'd' || *t == 'c' || *t == 'a') ); if (first_command_line < 0 && ((ed_command_letter = get_ed_command_letter (s)) || this_is_a_command)) { first_command_line = this_line; first_ed_command_letter = ed_command_letter; fcl_line = p_input_line; p_indent = indent; /* assume this for now */ p_strip_trailing_cr = strip_trailing_cr; } if (!stars_last_line && strnEQ(s, "*** ", 4)) name[OLD] = fetchname (s+4, strippath, &p_timestamp[OLD]); else if (strnEQ(s, "+++ ", 4)) /* Swap with NEW below. */ name[OLD] = fetchname (s+4, strippath, &p_timestamp[OLD]); else if (strnEQ(s, "Index:", 6)) name[INDEX] = fetchname (s+6, strippath, (time_t *) 0); else if (strnEQ(s, "Prereq:", 7)) { for (t = s + 7; ISSPACE ((unsigned char) *t); t++) continue; revision = t; for (t = revision; *t; t++) if (ISSPACE ((unsigned char) *t)) { char const *u; for (u = t + 1; ISSPACE ((unsigned char) *u); u++) continue; if (*u) { char numbuf[LINENUM_LENGTH_BOUND + 1]; say ("Prereq: with multiple words at line %s of patch\n", format_linenum (numbuf, this_line)); } break; } if (t == revision) revision = 0; else { char oldc = *t; *t = '\0'; revision = savestr (revision); *t = oldc; } } else { for (t = s; t[0] == '-' && t[1] == ' '; t += 2) continue; if (strnEQ(t, "--- ", 4)) { time_t timestamp = (time_t) -1; name[NEW] = fetchname (t+4, strippath, ×tamp); if (timestamp != (time_t) -1) { p_timestamp[NEW] = timestamp; p_rfc934_nesting = (t - s) >> 1; } } } if ((diff_type == NO_DIFF || diff_type == ED_DIFF) && first_command_line >= 0 && strEQ(s, ".\n") ) { p_start = first_command_line; p_sline = fcl_line; retval = ED_DIFF; goto scan_exit; } if ((diff_type == NO_DIFF || diff_type == UNI_DIFF) && strnEQ(s, "@@ -", 4)) { /* `name' and `p_timestamp' are backwards; swap them. */ time_t ti = p_timestamp[OLD]; p_timestamp[OLD] = p_timestamp[NEW]; p_timestamp[NEW] = ti; t = name[OLD]; name[OLD] = name[NEW]; name[NEW] = t; s += 4; if (s[0] == '0' && !ISDIGIT (s[1])) p_says_nonexistent[OLD] = 1 + ! p_timestamp[OLD]; while (*s != ' ' && *s != '\n') s++; while (*s == ' ') s++; if (s[0] == '+' && s[1] == '0' && !ISDIGIT (s[2])) p_says_nonexistent[NEW] = 1 + ! p_timestamp[NEW]; p_indent = indent; p_start = this_line; p_sline = p_input_line; retval = UNI_DIFF; if (! ((name[OLD] || ! p_timestamp[OLD]) && (name[NEW] || ! p_timestamp[NEW])) && ! name[INDEX]) { char numbuf[LINENUM_LENGTH_BOUND + 1]; say ("missing header for unified diff at line %s of patch\n", format_linenum (numbuf, p_sline)); } goto scan_exit; } stars_this_line = strnEQ(s, "********", 8); if ((diff_type == NO_DIFF || diff_type == CONTEXT_DIFF || diff_type == NEW_CONTEXT_DIFF) && stars_last_line && strnEQ (s, "*** ", 4)) { s += 4; if (s[0] == '0' && !ISDIGIT (s[1])) p_says_nonexistent[OLD] = 1 + ! p_timestamp[OLD]; /* if this is a new context diff the character just before */ /* the newline is a '*'. */ while (*s != '\n') s++; p_indent = indent; p_strip_trailing_cr = strip_trailing_cr; p_start = previous_line; p_sline = p_input_line - 1; retval = (*(s-1) == '*' ? NEW_CONTEXT_DIFF : CONTEXT_DIFF); { /* Scan the first hunk to see whether the file contents appear to have been deleted. */ file_offset saved_p_base = p_base; LINENUM saved_p_bline = p_bline; Fseek (pfp, previous_line, SEEK_SET); p_input_line -= 2; if (another_hunk (retval, false) && ! p_repl_lines && p_newfirst == 1) p_says_nonexistent[NEW] = 1 + ! p_timestamp[NEW]; next_intuit_at (saved_p_base, saved_p_bline); } if (! ((name[OLD] || ! p_timestamp[OLD]) && (name[NEW] || ! p_timestamp[NEW])) && ! name[INDEX]) { char numbuf[LINENUM_LENGTH_BOUND + 1]; say ("missing header for context diff at line %s of patch\n", format_linenum (numbuf, p_sline)); } goto scan_exit; } if ((diff_type == NO_DIFF || diff_type == NORMAL_DIFF) && last_line_was_command && (strnEQ(s, "< ", 2) || strnEQ(s, "> ", 2)) ) { p_start = previous_line; p_sline = p_input_line - 1; p_indent = indent; p_strip_trailing_cr = strip_trailing_cr; retval = NORMAL_DIFF; goto scan_exit; } } scan_exit: /* To intuit `inname', the name of the file to patch, use the algorithm specified by POSIX 1003.1-2001 XCU lines 25680-26599 (with some modifications if posixly_correct is zero): - Take the old and new names from the context header if present, and take the index name from the `Index:' line if present and if either the old and new names are both absent or posixly_correct is nonzero. Consider the file names to be in the order (old, new, index). - If some named files exist, use the first one if posixly_correct is nonzero, the best one otherwise. - If patch_get is nonzero, and no named files exist, but an RCS or SCCS master file exists, use the first named file with an RCS or SCCS master. - If no named files exist, no RCS or SCCS master was found, some names are given, posixly_correct is zero, and the patch appears to create a file, then use the best name requiring the creation of the fewest directories. - Otherwise, report failure by setting `inname' to 0; this causes our invoker to ask the user for a file name. */ i = NONE; if (!inname) { enum nametype i0 = NONE; if (! posixly_correct && (name[OLD] || name[NEW]) && name[INDEX]) { free (name[INDEX]); name[INDEX] = 0; } for (i = OLD; i <= INDEX; i++) if (name[i]) { if (i0 != NONE && strcmp (name[i0], name[i]) == 0) { /* It's the same name as before; reuse stat results. */ stat_errno[i] = stat_errno[i0]; if (! stat_errno[i]) st[i] = st[i0]; } else if (stat (name[i], &st[i]) != 0) stat_errno[i] = errno; else { stat_errno[i] = 0; if (posixly_correct) break; } i0 = i; } if (! posixly_correct) { bool is_empty; i = best_name (name, stat_errno); if (i == NONE && patch_get) { enum nametype nope = NONE; for (i = OLD; i <= INDEX; i++) if (name[i]) { char const *cs; char *getbuf; char *diffbuf; bool readonly = (outfile && strcmp (outfile, name[i]) != 0); if (nope == NONE || strcmp (name[nope], name[i]) != 0) { cs = (version_controller (name[i], readonly, (struct stat *) 0, &getbuf, &diffbuf)); version_controlled[i] = !! cs; if (cs) { if (version_get (name[i], cs, false, readonly, getbuf, &st[i])) stat_errno[i] = 0; else version_controlled[i] = 0; free (getbuf); if (diffbuf) free (diffbuf); if (! stat_errno[i]) break; } } nope = i; } } is_empty = i == NONE || st[i].st_size == 0; if ((! is_empty) < p_says_nonexistent[reverse ^ is_empty]) { assert (i0 != NONE); reverse ^= ok_to_reverse ("The next patch%s would %s the file %s,\nwhich %s!", reverse ? ", when reversed," : "", (i == NONE ? "delete" : st[i].st_size == 0 ? "empty out" : "create"), quotearg (name[i == NONE || st[i].st_size == 0 ? i0 : i]), (i == NONE ? "does not exist" : st[i].st_size == 0 ? "is already empty" : "already exists")); } if (i == NONE && p_says_nonexistent[reverse]) { int newdirs[3]; int newdirs_min = INT_MAX; int distance_from_minimum[3]; for (i = OLD; i <= INDEX; i++) if (name[i]) { newdirs[i] = (prefix_components (name[i], false) - prefix_components (name[i], true)); if (newdirs[i] < newdirs_min) newdirs_min = newdirs[i]; } for (i = OLD; i <= INDEX; i++) if (name[i]) distance_from_minimum[i] = newdirs[i] - newdirs_min; i = best_name (name, distance_from_minimum); } } } if (i == NONE) inerrno = -1; else { inname = name[i]; name[i] = 0; inerrno = stat_errno[i]; invc = version_controlled[i]; instat = st[i]; } for (i = OLD; i <= INDEX; i++) if (name[i]) free (name[i]); return retval; } /* Count the path name components in FILENAME's prefix. If CHECKDIRS is true, count only existing directories. */ static int prefix_components (char *filename, bool checkdirs) { int count = 0; struct stat stat_buf; int stat_result; char *f = filename + FILESYSTEM_PREFIX_LEN (filename); if (*f) while (*++f) if (ISSLASH (f[0]) && ! ISSLASH (f[-1])) { if (checkdirs) { *f = '\0'; stat_result = stat (filename, &stat_buf); *f = '/'; if (! (stat_result == 0 && S_ISDIR (stat_buf.st_mode))) break; } count++; } return count; } /* Return the index of the best of NAME[OLD], NAME[NEW], and NAME[INDEX]. Ignore null names, and ignore NAME[i] if IGNORE[i] is nonzero. Return NONE if all names are ignored. */ static enum nametype best_name (char *const *name, int const *ignore) { enum nametype i; int components[3]; int components_min = INT_MAX; size_t basename_len[3]; size_t basename_len_min = SIZE_MAX; size_t len[3]; size_t len_min = SIZE_MAX; for (i = OLD; i <= INDEX; i++) if (name[i] && !ignore[i]) { /* Take the names with the fewest prefix components. */ components[i] = prefix_components (name[i], false); if (components_min < components[i]) continue; components_min = components[i]; /* Of those, take the names with the shortest basename. */ basename_len[i] = strlen (base_name (name[i])); if (basename_len_min < basename_len[i]) continue; basename_len_min = basename_len[i]; /* Of those, take the shortest names. */ len[i] = strlen (name[i]); if (len_min < len[i]) continue; len_min = len[i]; } /* Of those, take the first name. */ for (i = OLD; i <= INDEX; i++) if (name[i] && !ignore[i] && components[i] == components_min && basename_len[i] == basename_len_min && len[i] == len_min) break; return i; } /* Remember where this patch ends so we know where to start up again. */ static void next_intuit_at (file_offset file_pos, LINENUM file_line) { p_base = file_pos; p_bline = file_line; } /* Basically a verbose fseek() to the actual diff listing. */ static void skip_to (file_offset file_pos, LINENUM file_line) { register FILE *i = pfp; register FILE *o = stdout; register int c; assert(p_base <= file_pos); if ((verbosity == VERBOSE || !inname) && p_base < file_pos) { Fseek (i, p_base, SEEK_SET); say ("The text leading up to this was:\n--------------------------\n"); while (file_tell (i) < file_pos) { putc ('|', o); do { if ((c = getc (i)) == EOF) read_fatal (); putc (c, o); } while (c != '\n'); } say ("--------------------------\n"); } else Fseek (i, file_pos, SEEK_SET); p_input_line = file_line - 1; } /* Make this a function for better debugging. */ static void malformed (void) { char numbuf[LINENUM_LENGTH_BOUND + 1]; fatal ("malformed patch at line %s: %s", format_linenum (numbuf, p_input_line), buf); /* about as informative as "Syntax error" in C */ } /* Parse a line number from a string. Return the address of the first char after the number. */ static char * scan_linenum (char *s0, LINENUM *linenum) { char *s; LINENUM n = 0; bool overflow = false; char numbuf[LINENUM_LENGTH_BOUND + 1]; for (s = s0; ISDIGIT (*s); s++) { LINENUM new_n = 10 * n + (*s - '0'); overflow |= new_n / 10 != n; n = new_n; } if (s == s0) fatal ("missing line number at line %s: %s", format_linenum (numbuf, p_input_line), buf); if (overflow) fatal ("line number %.*s is too large at line %s: %s", (int) (s - s0), s0, format_linenum (numbuf, p_input_line), buf); *linenum = n; return s; } /* 1 if there is more of the current diff listing to process; 0 if not; -1 if ran out of memory. */ int another_hunk (enum diff difftype, bool rev) { register char *s; register LINENUM context = 0; register size_t chars_read; char numbuf0[LINENUM_LENGTH_BOUND + 1]; char numbuf1[LINENUM_LENGTH_BOUND + 1]; char numbuf2[LINENUM_LENGTH_BOUND + 1]; char numbuf3[LINENUM_LENGTH_BOUND + 1]; while (p_end >= 0) { if (p_end == p_efake) p_end = p_bfake; /* don't free twice */ else free(p_line[p_end]); p_end--; } assert(p_end == -1); p_efake = -1; p_max = hunkmax; /* gets reduced when --- found */ if (difftype == CONTEXT_DIFF || difftype == NEW_CONTEXT_DIFF) { file_offset line_beginning = file_tell (pfp); /* file pos of the current line */ LINENUM repl_beginning = 0; /* index of --- line */ register LINENUM fillcnt = 0; /* #lines of missing ptrn or repl */ register LINENUM fillsrc; /* index of first line to copy */ register LINENUM filldst; /* index of first missing line */ bool ptrn_spaces_eaten = false; /* ptrn was slightly misformed */ bool some_context = false; /* (perhaps internal) context seen */ register bool repl_could_be_missing = true; bool ptrn_missing = false; /* The pattern was missing. */ bool repl_missing = false; /* Likewise for replacement. */ file_offset repl_backtrack_position = 0; /* file pos of first repl line */ LINENUM repl_patch_line; /* input line number for same */ LINENUM repl_context; /* context for same */ LINENUM ptrn_prefix_context = -1; /* lines in pattern prefix context */ LINENUM ptrn_suffix_context = -1; /* lines in pattern suffix context */ LINENUM repl_prefix_context = -1; /* lines in replac. prefix context */ LINENUM ptrn_copiable = 0; /* # of copiable lines in ptrn */ LINENUM repl_copiable = 0; /* Likewise for replacement. */ /* Pacify `gcc -Wall'. */ fillsrc = filldst = repl_patch_line = repl_context = 0; chars_read = get_line (); if (chars_read == (size_t) -1 || chars_read <= 8 || strncmp (buf, "********", 8) != 0) { next_intuit_at(line_beginning,p_input_line); return chars_read == (size_t) -1 ? -1 : 0; } p_hunk_beg = p_input_line + 1; while (p_end < p_max) { chars_read = get_line (); if (chars_read == (size_t) -1) return -1; if (!chars_read) { if (repl_beginning && repl_could_be_missing) { repl_missing = true; goto hunk_done; } if (p_max - p_end < 4) { strcpy (buf, " \n"); /* assume blank lines got chopped */ chars_read = 3; } else { fatal ("unexpected end of file in patch"); } } p_end++; if (p_end == hunkmax) fatal ("unterminated hunk starting at line %s; giving up at line %s: %s", format_linenum (numbuf0, pch_hunk_beg ()), format_linenum (numbuf1, p_input_line), buf); assert(p_end < hunkmax); p_Char[p_end] = *buf; p_len[p_end] = 0; p_line[p_end] = 0; switch (*buf) { case '*': if (strnEQ(buf, "********", 8)) { if (repl_beginning && repl_could_be_missing) { repl_missing = true; goto hunk_done; } else fatal ("unexpected end of hunk at line %s", format_linenum (numbuf0, p_input_line)); } if (p_end != 0) { if (repl_beginning && repl_could_be_missing) { repl_missing = true; goto hunk_done; } fatal ("unexpected `***' at line %s: %s", format_linenum (numbuf0, p_input_line), buf); } context = 0; p_len[p_end] = strlen (buf); if (! (p_line[p_end] = savestr (buf))) { p_end--; return -1; } for (s = buf; *s && !ISDIGIT (*s); s++) continue; if (strnEQ(s,"0,0",3)) remove_prefix (s, 2); s = scan_linenum (s, &p_first); if (*s == ',') { while (*s && !ISDIGIT (*s)) s++; scan_linenum (s, &p_ptrn_lines); p_ptrn_lines += 1 - p_first; } else if (p_first) p_ptrn_lines = 1; else { p_ptrn_lines = 0; p_first = 1; } p_max = p_ptrn_lines + 6; /* we need this much at least */ while (p_max >= hunkmax) if (! grow_hunkmax ()) return -1; p_max = hunkmax; break; case '-': if (buf[1] != '-') goto change_line; if (ptrn_prefix_context == -1) ptrn_prefix_context = context; ptrn_suffix_context = context; if (repl_beginning || (p_end != p_ptrn_lines + 1 + (p_Char[p_end - 1] == '\n'))) { if (p_end == 1) { /* `Old' lines were omitted. Set up to fill them in from `new' context lines. */ ptrn_missing = true; p_end = p_ptrn_lines + 1; ptrn_prefix_context = ptrn_suffix_context = -1; fillsrc = p_end + 1; filldst = 1; fillcnt = p_ptrn_lines; } else if (! repl_beginning) fatal ("%s `---' at line %s; check line numbers at line %s", (p_end <= p_ptrn_lines ? "Premature" : "Overdue"), format_linenum (numbuf0, p_input_line), format_linenum (numbuf1, p_hunk_beg)); else if (! repl_could_be_missing) fatal ("duplicate `---' at line %s; check line numbers at line %s", format_linenum (numbuf0, p_input_line), format_linenum (numbuf1, p_hunk_beg + repl_beginning)); else { repl_missing = true; goto hunk_done; } } repl_beginning = p_end; repl_backtrack_position = file_tell (pfp); repl_patch_line = p_input_line; repl_context = context; p_len[p_end] = strlen (buf); if (! (p_line[p_end] = savestr (buf))) { p_end--; return -1; } p_Char[p_end] = '='; for (s = buf; *s && ! ISDIGIT (*s); s++) continue; s = scan_linenum (s, &p_newfirst); if (*s == ',') { do { if (!*++s) malformed (); } while (! ISDIGIT (*s)); scan_linenum (s, &p_repl_lines); p_repl_lines += 1 - p_newfirst; } else if (p_newfirst) p_repl_lines = 1; else { p_repl_lines = 0; p_newfirst = 1; } p_max = p_repl_lines + p_end; while (p_max >= hunkmax) if (! grow_hunkmax ()) return -1; if (p_repl_lines != ptrn_copiable && (p_prefix_context != 0 || context != 0 || p_repl_lines != 1)) repl_could_be_missing = false; context = 0; break; case '+': case '!': repl_could_be_missing = false; change_line: s = buf + 1; chars_read--; if (*s == '\n' && canonicalize) { strcpy (s, " \n"); chars_read = 2; } if (*s == ' ' || *s == '\t') { s++; chars_read--; } else if (repl_beginning && repl_could_be_missing) { repl_missing = true; goto hunk_done; } if (! repl_beginning) { if (ptrn_prefix_context == -1) ptrn_prefix_context = context; } else { if (repl_prefix_context == -1) repl_prefix_context = context; } chars_read -= (1 < chars_read && p_end == (repl_beginning ? p_max : p_ptrn_lines) && incomplete_line ()); p_len[p_end] = chars_read; if (! (p_line[p_end] = savebuf (s, chars_read))) { p_end--; return -1; } context = 0; break; case '\t': case '\n': /* assume spaces got eaten */ s = buf; if (*buf == '\t') { s++; chars_read--; } if (repl_beginning && repl_could_be_missing && (!ptrn_spaces_eaten || difftype == NEW_CONTEXT_DIFF) ) { repl_missing = true; goto hunk_done; } chars_read -= (1 < chars_read && p_end == (repl_beginning ? p_max : p_ptrn_lines) && incomplete_line ()); p_len[p_end] = chars_read; if (! (p_line[p_end] = savebuf (buf, chars_read))) { p_end--; return -1; } if (p_end != p_ptrn_lines + 1) { ptrn_spaces_eaten |= (repl_beginning != 0); some_context = true; context++; if (repl_beginning) repl_copiable++; else ptrn_copiable++; p_Char[p_end] = ' '; } break; case ' ': s = buf + 1; chars_read--; if (*s == '\n' && canonicalize) { strcpy (s, "\n"); chars_read = 2; } if (*s == ' ' || *s == '\t') { s++; chars_read--; } else if (repl_beginning && repl_could_be_missing) { repl_missing = true; goto hunk_done; } some_context = true; context++; if (repl_beginning) repl_copiable++; else ptrn_copiable++; chars_read -= (1 < chars_read && p_end == (repl_beginning ? p_max : p_ptrn_lines) && incomplete_line ()); p_len[p_end] = chars_read; if (! (p_line[p_end] = savebuf (buf + 2, chars_read))) { p_end--; return -1; } break; default: if (repl_beginning && repl_could_be_missing) { repl_missing = true; goto hunk_done; } malformed (); } } hunk_done: if (p_end >=0 && !repl_beginning) fatal ("no `---' found in patch at line %s", format_linenum (numbuf0, pch_hunk_beg ())); if (repl_missing) { /* reset state back to just after --- */ p_input_line = repl_patch_line; context = repl_context; for (p_end--; p_end > repl_beginning; p_end--) free(p_line[p_end]); Fseek (pfp, repl_backtrack_position, SEEK_SET); /* redundant 'new' context lines were omitted - set */ /* up to fill them in from the old file context */ fillsrc = 1; filldst = repl_beginning+1; fillcnt = p_repl_lines; p_end = p_max; } else if (! ptrn_missing && ptrn_copiable != repl_copiable) fatal ("context mangled in hunk at line %s", format_linenum (numbuf0, p_hunk_beg)); else if (!some_context && fillcnt == 1) { /* the first hunk was a null hunk with no context */ /* and we were expecting one line -- fix it up. */ while (filldst < p_end) { p_line[filldst] = p_line[filldst+1]; p_Char[filldst] = p_Char[filldst+1]; p_len[filldst] = p_len[filldst+1]; filldst++; } #if 0 repl_beginning--; /* this doesn't need to be fixed */ #endif p_end--; p_first++; /* do append rather than insert */ fillcnt = 0; p_ptrn_lines = 0; } p_prefix_context = ((repl_prefix_context == -1 || (ptrn_prefix_context != -1 && ptrn_prefix_context < repl_prefix_context)) ? ptrn_prefix_context : repl_prefix_context); p_suffix_context = ((ptrn_suffix_context != -1 && ptrn_suffix_context < context) ? ptrn_suffix_context : context); assert (p_prefix_context != -1 && p_suffix_context != -1); if (difftype == CONTEXT_DIFF && (fillcnt || (p_first > 1 && p_prefix_context + p_suffix_context < ptrn_copiable))) { if (verbosity == VERBOSE) say ("%s\n%s\n%s\n", "(Fascinating -- this is really a new-style context diff but without", "the telltale extra asterisks on the *** line that usually indicate", "the new style...)"); diff_type = difftype = NEW_CONTEXT_DIFF; } /* if there were omitted context lines, fill them in now */ if (fillcnt) { p_bfake = filldst; /* remember where not to free() */ p_efake = filldst + fillcnt - 1; while (fillcnt-- > 0) { while (fillsrc <= p_end && fillsrc != repl_beginning && p_Char[fillsrc] != ' ') fillsrc++; if (p_end < fillsrc || fillsrc == repl_beginning) { fatal ("replacement text or line numbers mangled in hunk at line %s", format_linenum (numbuf0, p_hunk_beg)); } p_line[filldst] = p_line[fillsrc]; p_Char[filldst] = p_Char[fillsrc]; p_len[filldst] = p_len[fillsrc]; fillsrc++; filldst++; } while (fillsrc <= p_end && fillsrc != repl_beginning) { if (p_Char[fillsrc] == ' ') fatal ("replacement text or line numbers mangled in hunk at line %s", format_linenum (numbuf0, p_hunk_beg)); fillsrc++; } if (debug & 64) printf ("fillsrc %s, filldst %s, rb %s, e+1 %s\n", format_linenum (numbuf0, fillsrc), format_linenum (numbuf1, filldst), format_linenum (numbuf2, repl_beginning), format_linenum (numbuf3, p_end + 1)); assert(fillsrc==p_end+1 || fillsrc==repl_beginning); assert(filldst==p_end+1 || filldst==repl_beginning); } } else if (difftype == UNI_DIFF) { file_offset line_beginning = file_tell (pfp); /* file pos of the current line */ register LINENUM fillsrc; /* index of old lines */ register LINENUM filldst; /* index of new lines */ char ch = '\0'; chars_read = get_line (); if (chars_read == (size_t) -1 || chars_read <= 4 || strncmp (buf, "@@ -", 4) != 0) { next_intuit_at(line_beginning,p_input_line); return chars_read == (size_t) -1 ? -1 : 0; } s = scan_linenum (buf + 4, &p_first); if (*s == ',') s = scan_linenum (s + 1, &p_ptrn_lines); else p_ptrn_lines = 1; if (*s == ' ') s++; if (*s != '+') malformed (); s = scan_linenum (s + 1, &p_newfirst); if (*s == ',') s = scan_linenum (s + 1, &p_repl_lines); else p_repl_lines = 1; if (*s == ' ') s++; if (*s != '@') malformed (); if (!p_ptrn_lines) p_first++; /* do append rather than insert */ if (!p_repl_lines) p_newfirst++; p_max = p_ptrn_lines + p_repl_lines + 1; while (p_max >= hunkmax) if (! grow_hunkmax ()) return -1; fillsrc = 1; filldst = fillsrc + p_ptrn_lines; p_end = filldst + p_repl_lines; sprintf (buf, "*** %s,%s ****\n", format_linenum (numbuf0, p_first), format_linenum (numbuf1, p_first + p_ptrn_lines - 1)); p_len[0] = strlen (buf); if (! (p_line[0] = savestr (buf))) { p_end = -1; return -1; } p_Char[0] = '*'; sprintf (buf, "--- %s,%s ----\n", format_linenum (numbuf0, p_newfirst), format_linenum (numbuf1, p_newfirst + p_repl_lines - 1)); p_len[filldst] = strlen (buf); if (! (p_line[filldst] = savestr (buf))) { p_end = 0; return -1; } p_Char[filldst++] = '='; p_prefix_context = -1; p_hunk_beg = p_input_line + 1; while (fillsrc <= p_ptrn_lines || filldst <= p_end) { chars_read = get_line (); if (!chars_read) { if (p_max - filldst < 3) { strcpy (buf, " \n"); /* assume blank lines got chopped */ chars_read = 2; } else { fatal ("unexpected end of file in patch"); } } if (chars_read == (size_t) -1) s = 0; else if (*buf == '\t' || *buf == '\n') { ch = ' '; /* assume the space got eaten */ s = savebuf (buf, chars_read); } else { ch = *buf; s = savebuf (buf+1, --chars_read); } if (!s) { while (--filldst > p_ptrn_lines) free(p_line[filldst]); p_end = fillsrc-1; return -1; } switch (ch) { case '-': if (fillsrc > p_ptrn_lines) { free(s); p_end = filldst-1; malformed (); } chars_read -= fillsrc == p_ptrn_lines && incomplete_line (); p_Char[fillsrc] = ch; p_line[fillsrc] = s; p_len[fillsrc++] = chars_read; break; case '=': ch = ' '; /* FALL THROUGH */ case ' ': if (fillsrc > p_ptrn_lines) { free(s); while (--filldst > p_ptrn_lines) free(p_line[filldst]); p_end = fillsrc-1; malformed (); } context++; chars_read -= fillsrc == p_ptrn_lines && incomplete_line (); p_Char[fillsrc] = ch; p_line[fillsrc] = s; p_len[fillsrc++] = chars_read; s = savebuf (s, chars_read); if (!s) { while (--filldst > p_ptrn_lines) free(p_line[filldst]); p_end = fillsrc-1; return -1; } /* FALL THROUGH */ case '+': if (filldst > p_end) { free(s); while (--filldst > p_ptrn_lines) free(p_line[filldst]); p_end = fillsrc-1; malformed (); } chars_read -= filldst == p_end && incomplete_line (); p_Char[filldst] = ch; p_line[filldst] = s; p_len[filldst++] = chars_read; break; default: p_end = filldst; malformed (); } if (ch != ' ') { if (p_prefix_context == -1) p_prefix_context = context; context = 0; } }/* while */ if (p_prefix_context == -1) malformed (); p_suffix_context = context; } else { /* normal diff--fake it up */ char hunk_type; register int i; LINENUM min, max; file_offset line_beginning = file_tell (pfp); p_prefix_context = p_suffix_context = 0; chars_read = get_line (); if (chars_read == (size_t) -1 || !chars_read || !ISDIGIT (*buf)) { next_intuit_at(line_beginning,p_input_line); return chars_read == (size_t) -1 ? -1 : 0; } s = scan_linenum (buf, &p_first); if (*s == ',') { s = scan_linenum (s + 1, &p_ptrn_lines); p_ptrn_lines += 1 - p_first; } else p_ptrn_lines = (*s != 'a'); hunk_type = *s; if (hunk_type == 'a') p_first++; /* do append rather than insert */ s = scan_linenum (s + 1, &min); if (*s == ',') scan_linenum (s + 1, &max); else max = min; if (hunk_type == 'd') min++; p_end = p_ptrn_lines + 1 + max - min + 1; while (p_end >= hunkmax) if (! grow_hunkmax ()) { p_end = -1; return -1; } p_newfirst = min; p_repl_lines = max - min + 1; sprintf (buf, "*** %s,%s\n", format_linenum (numbuf0, p_first), format_linenum (numbuf1, p_first + p_ptrn_lines - 1)); p_len[0] = strlen (buf); if (! (p_line[0] = savestr (buf))) { p_end = -1; return -1; } p_Char[0] = '*'; for (i=1; i<=p_ptrn_lines; i++) { chars_read = get_line (); if (chars_read == (size_t) -1) { p_end = i - 1; return -1; } if (!chars_read) fatal ("unexpected end of file in patch at line %s", format_linenum (numbuf0, p_input_line)); if (buf[0] != '<' || (buf[1] != ' ' && buf[1] != '\t')) fatal ("`<' expected at line %s of patch", format_linenum (numbuf0, p_input_line)); chars_read -= 2 + (i == p_ptrn_lines && incomplete_line ()); p_len[i] = chars_read; if (! (p_line[i] = savebuf (buf + 2, chars_read))) { p_end = i-1; return -1; } p_Char[i] = '-'; } if (hunk_type == 'c') { chars_read = get_line (); if (chars_read == (size_t) -1) { p_end = i - 1; return -1; } if (! chars_read) fatal ("unexpected end of file in patch at line %s", format_linenum (numbuf0, p_input_line)); if (*buf != '-') fatal ("`---' expected at line %s of patch", format_linenum (numbuf0, p_input_line)); } sprintf (buf, "--- %s,%s\n", format_linenum (numbuf0, min), format_linenum (numbuf1, max)); p_len[i] = strlen (buf); if (! (p_line[i] = savestr (buf))) { p_end = i-1; return -1; } p_Char[i] = '='; for (i++; i<=p_end; i++) { chars_read = get_line (); if (chars_read == (size_t) -1) { p_end = i - 1; return -1; } if (!chars_read) fatal ("unexpected end of file in patch at line %s", format_linenum (numbuf0, p_input_line)); if (buf[0] != '>' || (buf[1] != ' ' && buf[1] != '\t')) fatal ("`>' expected at line %s of patch", format_linenum (numbuf0, p_input_line)); chars_read -= 2 + (i == p_end && incomplete_line ()); p_len[i] = chars_read; if (! (p_line[i] = savebuf (buf + 2, chars_read))) { p_end = i-1; return -1; } p_Char[i] = '+'; } } if (rev) /* backwards patch? */ if (!pch_swap()) say ("Not enough memory to swap next hunk!\n"); if (debug & 2) { LINENUM i; char special; for (i=0; i <= p_end; i++) { if (i == p_ptrn_lines) special = '^'; else special = ' '; fprintf (stderr, "%s %c %c ", format_linenum (numbuf0, i), p_Char[i], special); pch_write_line (i, stderr); fflush (stderr); } } if (p_end+1 < hunkmax) /* paranoia reigns supreme... */ p_Char[p_end+1] = '^'; /* add a stopper for apply_hunk */ return 1; } static size_t get_line (void) { return pget_line (p_indent, p_rfc934_nesting, p_strip_trailing_cr, p_pass_comments_through); } /* Input a line from the patch file, worrying about indentation. Strip up to INDENT characters' worth of leading indentation. Then remove up to RFC934_NESTING instances of leading "- ". If STRIP_TRAILING_CR is true, remove any trailing carriage-return. Unless PASS_COMMENTS_THROUGH is true, ignore any resulting lines that begin with '#'; they're comments. Ignore any partial lines at end of input, but warn about them. Succeed if a line was read; it is terminated by "\n\0" for convenience. Return the number of characters read, including '\n' but not '\0'. Return -1 if we ran out of memory. */ static size_t pget_line (int indent, int rfc934_nesting, bool strip_trailing_cr, bool pass_comments_through) { register FILE *fp = pfp; register int c; register int i; register char *b; register size_t s; do { i = 0; for (;;) { c = getc (fp); if (c == EOF) { if (ferror (fp)) read_fatal (); return 0; } if (indent <= i) break; if (c == ' ' || c == 'X') i++; else if (c == '\t') i = (i + 8) & ~7; else break; } i = 0; b = buf; while (c == '-' && 0 <= --rfc934_nesting) { c = getc (fp); if (c == EOF) goto patch_ends_in_middle_of_line; if (c != ' ') { i = 1; b[0] = '-'; break; } c = getc (fp); if (c == EOF) goto patch_ends_in_middle_of_line; } s = bufsize; for (;;) { if (i == s - 1) { s *= 2; b = realloc (b, s); if (!b) { if (!using_plan_a) memory_fatal (); return (size_t) -1; } buf = b; bufsize = s; } b[i++] = c; if (c == '\n') break; c = getc (fp); if (c == EOF) goto patch_ends_in_middle_of_line; } p_input_line++; } while (*b == '#' && !pass_comments_through); if (strip_trailing_cr && 2 <= i && b[i - 2] == '\r') b[i-- - 2] = '\n'; b[i] = '\0'; return i; patch_ends_in_middle_of_line: if (ferror (fp)) read_fatal (); say ("patch unexpectedly ends in middle of line\n"); return 0; } static bool incomplete_line (void) { register FILE *fp = pfp; register int c; register file_offset line_beginning = file_tell (fp); if (getc (fp) == '\\') { while ((c = getc (fp)) != '\n' && c != EOF) continue; return true; } else { /* We don't trust ungetc. */ Fseek (pfp, line_beginning, SEEK_SET); return false; } } /* Reverse the old and new portions of the current hunk. */ bool pch_swap (void) { char **tp_line; /* the text of the hunk */ size_t *tp_len; /* length of each line */ char *tp_char; /* +, -, and ! */ register LINENUM i; register LINENUM n; bool blankline = false; register char *s; i = p_first; p_first = p_newfirst; p_newfirst = i; /* make a scratch copy */ tp_line = p_line; tp_len = p_len; tp_char = p_Char; p_line = 0; /* force set_hunkmax to allocate again */ p_len = 0; p_Char = 0; set_hunkmax(); if (!p_line || !p_len || !p_Char) { if (p_line) free (p_line); p_line = tp_line; if (p_len) free (p_len); p_len = tp_len; if (p_Char) free (p_Char); p_Char = tp_char; return false; /* not enough memory to swap hunk! */ } /* now turn the new into the old */ i = p_ptrn_lines + 1; if (tp_char[i] == '\n') { /* account for possible blank line */ blankline = true; i++; } if (p_efake >= 0) { /* fix non-freeable ptr range */ if (p_efake <= i) n = p_end - i + 1; else n = -i; p_efake += n; p_bfake += n; } for (n=0; i <= p_end; i++,n++) { p_line[n] = tp_line[i]; p_Char[n] = tp_char[i]; if (p_Char[n] == '+') p_Char[n] = '-'; p_len[n] = tp_len[i]; } if (blankline) { i = p_ptrn_lines + 1; p_line[n] = tp_line[i]; p_Char[n] = tp_char[i]; p_len[n] = tp_len[i]; n++; } assert(p_Char[0] == '='); p_Char[0] = '*'; for (s=p_line[0]; *s; s++) if (*s == '-') *s = '*'; /* now turn the old into the new */ assert(tp_char[0] == '*'); tp_char[0] = '='; for (s=tp_line[0]; *s; s++) if (*s == '*') *s = '-'; for (i=0; n <= p_end; i++,n++) { p_line[n] = tp_line[i]; p_Char[n] = tp_char[i]; if (p_Char[n] == '-') p_Char[n] = '+'; p_len[n] = tp_len[i]; } assert(i == p_ptrn_lines + 1); i = p_ptrn_lines; p_ptrn_lines = p_repl_lines; p_repl_lines = i; if (tp_line) free (tp_line); if (tp_len) free (tp_len); if (tp_char) free (tp_char); return true; } /* Return whether file WHICH (false = old, true = new) appears to nonexistent. Return 1 for empty, 2 for nonexistent. */ int pch_says_nonexistent (bool which) { return p_says_nonexistent[which]; } /* Return timestamp of patch header for file WHICH (false = old, true = new), or -1 if there was no timestamp or an error in the timestamp. */ time_t pch_timestamp (bool which) { return p_timestamp[which]; } /* Return the specified line position in the old file of the old context. */ LINENUM pch_first (void) { return p_first; } /* Return the number of lines of old context. */ LINENUM pch_ptrn_lines (void) { return p_ptrn_lines; } /* Return the probable line position in the new file of the first line. */ LINENUM pch_newfirst (void) { return p_newfirst; } /* Return the number of lines in the replacement text including context. */ LINENUM pch_repl_lines (void) { return p_repl_lines; } /* Return the number of lines in the whole hunk. */ LINENUM pch_end (void) { return p_end; } /* Return the number of context lines before the first changed line. */ LINENUM pch_prefix_context (void) { return p_prefix_context; } /* Return the number of context lines after the last changed line. */ LINENUM pch_suffix_context (void) { return p_suffix_context; } /* Return the length of a particular patch line. */ size_t pch_line_len (LINENUM line) { return p_len[line]; } /* Return the control character (+, -, *, !, etc) for a patch line. */ char pch_char (LINENUM line) { return p_Char[line]; } /* Return a pointer to a particular patch line. */ char * pfetch (LINENUM line) { return p_line[line]; } /* Output a patch line. */ bool pch_write_line (LINENUM line, FILE *file) { bool after_newline = p_line[line][p_len[line] - 1] == '\n'; if (! fwrite (p_line[line], sizeof (*p_line[line]), p_len[line], file)) write_fatal (); return after_newline; } /* Return where in the patch file this hunk began, for error messages. */ LINENUM pch_hunk_beg (void) { return p_hunk_beg; } /* Is the newline-terminated line a valid `ed' command for patch input? If so, return the command character; if not, return 0. This accepts accepts just a subset of the valid commands, but it's good enough in practice. */ static char get_ed_command_letter (char const *line) { char const *p = line; char letter; bool pair = false; if (! ISDIGIT (*p)) return 0; while (ISDIGIT (*++p)) continue; if (*p == ',') { if (! ISDIGIT (*++p)) return 0; while (ISDIGIT (*++p)) continue; pair = true; } letter = *p++; switch (letter) { case 'a': case 'i': if (pair) return 0; break; case 'c': case 'd': break; case 's': if (strncmp (p, "/.//", 4) != 0) return 0; p += 4; break; default: return 0; } while (*p == ' ' || *p == '\t') p++; if (*p == '\n') return letter; return 0; } /* Apply an ed script by feeding ed itself. */ void do_ed_script (FILE *ofp) { static char const ed_program[] = ed_PROGRAM; register file_offset beginning_of_this_line; register FILE *pipefp = 0; register size_t chars_read; if (! dry_run && ! skip_rest_of_patch) { int exclusive = TMPOUTNAME_needs_removal ? 0 : O_EXCL; assert (! inerrno); TMPOUTNAME_needs_removal = 1; copy_file (inname, TMPOUTNAME, exclusive, instat.st_mode); sprintf (buf, "%s %s%s", ed_program, verbosity == VERBOSE ? "" : "- ", TMPOUTNAME); fflush (stdout); pipefp = popen(buf, binary_transput ? "wb" : "w"); if (!pipefp) pfatal ("Can't open pipe to %s", quotearg (buf)); } for (;;) { char ed_command_letter; beginning_of_this_line = file_tell (pfp); chars_read = get_line (); if (! chars_read) { next_intuit_at(beginning_of_this_line,p_input_line); break; } ed_command_letter = get_ed_command_letter (buf); if (ed_command_letter) { if (pipefp) if (! fwrite (buf, sizeof *buf, chars_read, pipefp)) write_fatal (); if (ed_command_letter != 'd' && ed_command_letter != 's') { p_pass_comments_through = true; while ((chars_read = get_line ()) != 0) { if (pipefp) if (! fwrite (buf, sizeof *buf, chars_read, pipefp)) write_fatal (); if (chars_read == 2 && strEQ (buf, ".\n")) break; } p_pass_comments_through = false; } } else { next_intuit_at(beginning_of_this_line,p_input_line); break; } } if (!pipefp) return; if (fwrite ("w\nq\n", sizeof (char), (size_t) 4, pipefp) == 0 || fflush (pipefp) != 0) write_fatal (); if (pclose (pipefp) != 0) fatal ("%s FAILED", ed_program); if (ofp) { FILE *ifp = fopen (TMPOUTNAME, binary_transput ? "rb" : "r"); int c; if (!ifp) pfatal ("can't open `%s'", TMPOUTNAME); while ((c = getc (ifp)) != EOF) if (putc (c, ofp) == EOF) write_fatal (); if (ferror (ifp) || fclose (ifp) != 0) read_fatal (); } }