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Diffstat (limited to 'filename.c')
| -rwxr-xr-x | filename.c | 1118 |
1 files changed, 1118 insertions, 0 deletions
diff --git a/filename.c b/filename.c new file mode 100755 index 0000000..14e85e3 --- /dev/null +++ b/filename.c @@ -0,0 +1,1118 @@ +/* + * Copyright (C) 1984-2012 Mark Nudelman + * + * You may distribute under the terms of either the GNU General Public + * License or the Less License, as specified in the README file. + * + * For more information, see the README file. + */ + + +/* + * Routines to mess around with filenames (and files). + * Much of this is very OS dependent. + */ + +#include "less.h" +#include "lglob.h" +#if MSDOS_COMPILER +#include <dos.h> +#if MSDOS_COMPILER==WIN32C && !defined(_MSC_VER) +#include <dir.h> +#endif +#if MSDOS_COMPILER==DJGPPC +#include <glob.h> +#include <dir.h> +#define _MAX_PATH PATH_MAX +#endif +#endif +#ifdef _OSK +#include <rbf.h> +#ifndef _OSK_MWC32 +#include <modes.h> +#endif +#endif +#if OS2 +#include <signal.h> +#endif + +#if HAVE_STAT +#include <sys/stat.h> +#ifndef S_ISDIR +#define S_ISDIR(m) (((m) & S_IFMT) == S_IFDIR) +#endif +#ifndef S_ISREG +#define S_ISREG(m) (((m) & S_IFMT) == S_IFREG) +#endif +#endif + + +extern int force_open; +extern int secure; +extern int use_lessopen; +extern int ctldisp; +extern int utf_mode; +extern IFILE curr_ifile; +extern IFILE old_ifile; +#if SPACES_IN_FILENAMES +extern char openquote; +extern char closequote; +#endif + +/* + * Remove quotes around a filename. + */ + public char * +shell_unquote(str) + char *str; +{ + char *name; + char *p; + + name = p = (char *) ecalloc(strlen(str)+1, sizeof(char)); + if (*str == openquote) + { + str++; + while (*str != '\0') + { + if (*str == closequote) + { + if (str[1] != closequote) + break; + str++; + } + *p++ = *str++; + } + } else + { + char *esc = get_meta_escape(); + int esclen = strlen(esc); + while (*str != '\0') + { + if (esclen > 0 && strncmp(str, esc, esclen) == 0) + str += esclen; + *p++ = *str++; + } + } + *p = '\0'; + return (name); +} + +/* + * Get the shell's escape character. + */ + public char * +get_meta_escape() +{ + char *s; + + s = lgetenv("LESSMETAESCAPE"); + if (s == NULL) + s = DEF_METAESCAPE; + return (s); +} + +/* + * Get the characters which the shell considers to be "metacharacters". + */ + static char * +metachars() +{ + static char *mchars = NULL; + + if (mchars == NULL) + { + mchars = lgetenv("LESSMETACHARS"); + if (mchars == NULL) + mchars = DEF_METACHARS; + } + return (mchars); +} + +/* + * Is this a shell metacharacter? + */ + static int +metachar(c) + char c; +{ + return (strchr(metachars(), c) != NULL); +} + +/* + * Insert a backslash before each metacharacter in a string. + */ + public char * +shell_quote(s) + char *s; +{ + char *p; + char *newstr; + int len; + char *esc = get_meta_escape(); + int esclen = strlen(esc); + int use_quotes = 0; + int have_quotes = 0; + + /* + * Determine how big a string we need to allocate. + */ + len = 1; /* Trailing null byte */ + for (p = s; *p != '\0'; p++) + { + len++; + if (*p == openquote || *p == closequote) + have_quotes = 1; + if (metachar(*p)) + { + if (esclen == 0) + { + /* + * We've got a metachar, but this shell + * doesn't support escape chars. Use quotes. + */ + use_quotes = 1; + } else + { + /* + * Allow space for the escape char. + */ + len += esclen; + } + } + } + if (use_quotes) + { + if (have_quotes) + /* + * We can't quote a string that contains quotes. + */ + return (NULL); + len = strlen(s) + 3; + } + /* + * Allocate and construct the new string. + */ + newstr = p = (char *) ecalloc(len, sizeof(char)); + if (use_quotes) + { + SNPRINTF3(newstr, len, "%c%s%c", openquote, s, closequote); + } else + { + while (*s != '\0') + { + if (metachar(*s)) + { + /* + * Add the escape char. + */ + strcpy(p, esc); + p += esclen; + } + *p++ = *s++; + } + *p = '\0'; + } + return (newstr); +} + +/* + * Return a pathname that points to a specified file in a specified directory. + * Return NULL if the file does not exist in the directory. + */ + static char * +dirfile(dirname, filename) + char *dirname; + char *filename; +{ + char *pathname; + char *qpathname; + int len; + int f; + + if (dirname == NULL || *dirname == '\0') + return (NULL); + /* + * Construct the full pathname. + */ + len= strlen(dirname) + strlen(filename) + 2; + pathname = (char *) calloc(len, sizeof(char)); + if (pathname == NULL) + return (NULL); + SNPRINTF3(pathname, len, "%s%s%s", dirname, PATHNAME_SEP, filename); + /* + * Make sure the file exists. + */ + qpathname = shell_unquote(pathname); + f = open(qpathname, OPEN_READ); + if (f < 0) + { + free(pathname); + pathname = NULL; + } else + { + close(f); + } + free(qpathname); + return (pathname); +} + +/* + * Return the full pathname of the given file in the "home directory". + */ + public char * +homefile(filename) + char *filename; +{ + register char *pathname; + + /* + * Try $HOME/filename. + */ + pathname = dirfile(lgetenv("HOME"), filename); + if (pathname != NULL) + return (pathname); +#if OS2 + /* + * Try $INIT/filename. + */ + pathname = dirfile(lgetenv("INIT"), filename); + if (pathname != NULL) + return (pathname); +#endif +#if MSDOS_COMPILER || OS2 + /* + * Look for the file anywhere on search path. + */ + pathname = (char *) calloc(_MAX_PATH, sizeof(char)); +#if MSDOS_COMPILER==DJGPPC + { + char *res = searchpath(filename); + if (res == 0) + *pathname = '\0'; + else + strcpy(pathname, res); + } +#else + _searchenv(filename, "PATH", pathname); +#endif + if (*pathname != '\0') + return (pathname); + free(pathname); +#endif + return (NULL); +} + +/* + * Expand a string, substituting any "%" with the current filename, + * and any "#" with the previous filename. + * But a string of N "%"s is just replaced with N-1 "%"s. + * Likewise for a string of N "#"s. + * {{ This is a lot of work just to support % and #. }} + */ + public char * +fexpand(s) + char *s; +{ + register char *fr, *to; + register int n; + register char *e; + IFILE ifile; + +#define fchar_ifile(c) \ + ((c) == '%' ? curr_ifile : \ + (c) == '#' ? old_ifile : NULL_IFILE) + + /* + * Make one pass to see how big a buffer we + * need to allocate for the expanded string. + */ + n = 0; + for (fr = s; *fr != '\0'; fr++) + { + switch (*fr) + { + case '%': + case '#': + if (fr > s && fr[-1] == *fr) + { + /* + * Second (or later) char in a string + * of identical chars. Treat as normal. + */ + n++; + } else if (fr[1] != *fr) + { + /* + * Single char (not repeated). Treat specially. + */ + ifile = fchar_ifile(*fr); + if (ifile == NULL_IFILE) + n++; + else + n += strlen(get_filename(ifile)); + } + /* + * Else it is the first char in a string of + * identical chars. Just discard it. + */ + break; + default: + n++; + break; + } + } + + e = (char *) ecalloc(n+1, sizeof(char)); + + /* + * Now copy the string, expanding any "%" or "#". + */ + to = e; + for (fr = s; *fr != '\0'; fr++) + { + switch (*fr) + { + case '%': + case '#': + if (fr > s && fr[-1] == *fr) + { + *to++ = *fr; + } else if (fr[1] != *fr) + { + ifile = fchar_ifile(*fr); + if (ifile == NULL_IFILE) + *to++ = *fr; + else + { + strcpy(to, get_filename(ifile)); + to += strlen(to); + } + } + break; + default: + *to++ = *fr; + break; + } + } + *to = '\0'; + return (e); +} + + +#if TAB_COMPLETE_FILENAME + +/* + * Return a blank-separated list of filenames which "complete" + * the given string. + */ + public char * +fcomplete(s) + char *s; +{ + char *fpat; + char *qs; + + if (secure) + return (NULL); + /* + * Complete the filename "s" by globbing "s*". + */ +#if MSDOS_COMPILER && (MSDOS_COMPILER == MSOFTC || MSDOS_COMPILER == BORLANDC) + /* + * But in DOS, we have to glob "s*.*". + * But if the final component of the filename already has + * a dot in it, just do "s*". + * (Thus, "FILE" is globbed as "FILE*.*", + * but "FILE.A" is globbed as "FILE.A*"). + */ + { + char *slash; + int len; + for (slash = s+strlen(s)-1; slash > s; slash--) + if (*slash == *PATHNAME_SEP || *slash == '/') + break; + len = strlen(s) + 4; + fpat = (char *) ecalloc(len, sizeof(char)); + if (strchr(slash, '.') == NULL) + SNPRINTF1(fpat, len, "%s*.*", s); + else + SNPRINTF1(fpat, len, "%s*", s); + } +#else + { + int len = strlen(s) + 2; + fpat = (char *) ecalloc(len, sizeof(char)); + SNPRINTF1(fpat, len, "%s*", s); + } +#endif + qs = lglob(fpat); + s = shell_unquote(qs); + if (strcmp(s,fpat) == 0) + { + /* + * The filename didn't expand. + */ + free(qs); + qs = NULL; + } + free(s); + free(fpat); + return (qs); +} +#endif + +/* + * Try to determine if a file is "binary". + * This is just a guess, and we need not try too hard to make it accurate. + */ + public int +bin_file(f) + int f; +{ + int n; + int bin_count = 0; + char data[256]; + char* p; + char* pend; + + if (!seekable(f)) + return (0); + if (lseek(f, (off_t)0, SEEK_SET) == BAD_LSEEK) + return (0); + n = read(f, data, sizeof(data)); + pend = &data[n]; + for (p = data; p < pend; ) + { + LWCHAR c = step_char(&p, +1, pend); + if (ctldisp == OPT_ONPLUS && IS_CSI_START(c)) + { + do { + c = step_char(&p, +1, pend); + } while (p < pend && is_ansi_middle(c)); + } else if (binary_char(c)) + bin_count++; + } + /* + * Call it a binary file if there are more than 5 binary characters + * in the first 256 bytes of the file. + */ + return (bin_count > 5); +} + +/* + * Try to determine the size of a file by seeking to the end. + */ + static POSITION +seek_filesize(f) + int f; +{ + off_t spos; + + spos = lseek(f, (off_t)0, SEEK_END); + if (spos == BAD_LSEEK) + return (NULL_POSITION); + return ((POSITION) spos); +} + +/* + * Read a string from a file. + * Return a pointer to the string in memory. + */ + static char * +readfd(fd) + FILE *fd; +{ + int len; + int ch; + char *buf; + char *p; + + /* + * Make a guess about how many chars in the string + * and allocate a buffer to hold it. + */ + len = 100; + buf = (char *) ecalloc(len, sizeof(char)); + for (p = buf; ; p++) + { + if ((ch = getc(fd)) == '\n' || ch == EOF) + break; + if (p - buf >= len-1) + { + /* + * The string is too big to fit in the buffer we have. + * Allocate a new buffer, twice as big. + */ + len *= 2; + *p = '\0'; + p = (char *) ecalloc(len, sizeof(char)); + strcpy(p, buf); + free(buf); + buf = p; + p = buf + strlen(buf); + } + *p = ch; + } + *p = '\0'; + return (buf); +} + + + +#if HAVE_POPEN + +FILE *popen(); + +/* + * Execute a shell command. + * Return a pointer to a pipe connected to the shell command's standard output. + */ + static FILE * +shellcmd(cmd) + char *cmd; +{ + FILE *fd; + +#if HAVE_SHELL + char *shell; + + shell = lgetenv("SHELL"); + if (shell != NULL && *shell != '\0') + { + char *scmd; + char *esccmd; + + /* + * Read the output of <$SHELL -c cmd>. + * Escape any metacharacters in the command. + */ + esccmd = shell_quote(cmd); + if (esccmd == NULL) + { + fd = popen(cmd, "r"); + } else + { + int len = strlen(shell) + strlen(esccmd) + 5; + scmd = (char *) ecalloc(len, sizeof(char)); + SNPRINTF3(scmd, len, "%s %s %s", shell, shell_coption(), esccmd); + free(esccmd); + fd = popen(scmd, "r"); + free(scmd); + } + } else +#endif + { + fd = popen(cmd, "r"); + } + /* + * Redirection in `popen' might have messed with the + * standard devices. Restore binary input mode. + */ + SET_BINARY(0); + return (fd); +} + +#endif /* HAVE_POPEN */ + + +/* + * Expand a filename, doing any system-specific metacharacter substitutions. + */ + public char * +lglob(filename) + char *filename; +{ + char *gfilename; + char *ofilename; + + ofilename = fexpand(filename); + if (secure) + return (ofilename); + filename = shell_unquote(ofilename); + +#ifdef DECL_GLOB_LIST +{ + /* + * The globbing function returns a list of names. + */ + int length; + char *p; + char *qfilename; + DECL_GLOB_LIST(list) + + GLOB_LIST(filename, list); + if (GLOB_LIST_FAILED(list)) + { + free(filename); + return (ofilename); + } + length = 1; /* Room for trailing null byte */ + for (SCAN_GLOB_LIST(list, p)) + { + INIT_GLOB_LIST(list, p); + qfilename = shell_quote(p); + if (qfilename != NULL) + { + length += strlen(qfilename) + 1; + free(qfilename); + } + } + gfilename = (char *) ecalloc(length, sizeof(char)); + for (SCAN_GLOB_LIST(list, p)) + { + INIT_GLOB_LIST(list, p); + qfilename = shell_quote(p); + if (qfilename != NULL) + { + sprintf(gfilename + strlen(gfilename), "%s ", qfilename); + free(qfilename); + } + } + /* + * Overwrite the final trailing space with a null terminator. + */ + *--p = '\0'; + GLOB_LIST_DONE(list); +} +#else +#ifdef DECL_GLOB_NAME +{ + /* + * The globbing function returns a single name, and + * is called multiple times to walk thru all names. + */ + register char *p; + register int len; + register int n; + char *pathname; + char *qpathname; + DECL_GLOB_NAME(fnd,drive,dir,fname,ext,handle) + + GLOB_FIRST_NAME(filename, &fnd, handle); + if (GLOB_FIRST_FAILED(handle)) + { + free(filename); + return (ofilename); + } + + _splitpath(filename, drive, dir, fname, ext); + len = 100; + gfilename = (char *) ecalloc(len, sizeof(char)); + p = gfilename; + do { + n = strlen(drive) + strlen(dir) + strlen(fnd.GLOB_NAME) + 1; + pathname = (char *) ecalloc(n, sizeof(char)); + SNPRINTF3(pathname, n, "%s%s%s", drive, dir, fnd.GLOB_NAME); + qpathname = shell_quote(pathname); + free(pathname); + if (qpathname != NULL) + { + n = strlen(qpathname); + while (p - gfilename + n + 2 >= len) + { + /* + * No room in current buffer. + * Allocate a bigger one. + */ + len *= 2; + *p = '\0'; + p = (char *) ecalloc(len, sizeof(char)); + strcpy(p, gfilename); + free(gfilename); + gfilename = p; + p = gfilename + strlen(gfilename); + } + strcpy(p, qpathname); + free(qpathname); + p += n; + *p++ = ' '; + } + } while (GLOB_NEXT_NAME(handle, &fnd) == 0); + + /* + * Overwrite the final trailing space with a null terminator. + */ + *--p = '\0'; + GLOB_NAME_DONE(handle); +} +#else +#if HAVE_POPEN +{ + /* + * We get the shell to glob the filename for us by passing + * an "echo" command to the shell and reading its output. + */ + FILE *fd; + char *s; + char *lessecho; + char *cmd; + char *esc; + int len; + + esc = get_meta_escape(); + if (strlen(esc) == 0) + esc = "-"; + esc = shell_quote(esc); + if (esc == NULL) + { + free(filename); + return (ofilename); + } + lessecho = lgetenv("LESSECHO"); + if (lessecho == NULL || *lessecho == '\0') + lessecho = "lessecho"; + /* + * Invoke lessecho, and read its output (a globbed list of filenames). + */ + len = strlen(lessecho) + strlen(ofilename) + (7*strlen(metachars())) + 24; + cmd = (char *) ecalloc(len, sizeof(char)); + SNPRINTF4(cmd, len, "%s -p0x%x -d0x%x -e%s ", lessecho, openquote, closequote, esc); + free(esc); + for (s = metachars(); *s != '\0'; s++) + sprintf(cmd + strlen(cmd), "-n0x%x ", *s); + sprintf(cmd + strlen(cmd), "-- %s", ofilename); + fd = shellcmd(cmd); + free(cmd); + if (fd == NULL) + { + /* + * Cannot create the pipe. + * Just return the original (fexpanded) filename. + */ + free(filename); + return (ofilename); + } + gfilename = readfd(fd); + pclose(fd); + if (*gfilename == '\0') + { + free(gfilename); + free(filename); + return (ofilename); + } +} +#else + /* + * No globbing functions at all. Just use the fexpanded filename. + */ + gfilename = save(filename); +#endif +#endif +#endif + free(filename); + free(ofilename); + return (gfilename); +} + +/* + * Return number of %s escapes in a string. + * Return a large number if there are any other % escapes besides %s. + */ + static int +num_pct_s(lessopen) + char *lessopen; +{ + int num; + + for (num = 0;; num++) + { + lessopen = strchr(lessopen, '%'); + if (lessopen == NULL) + break; + if (*++lessopen != 's') + return (999); + } + return (num); +} + +/* + * See if we should open a "replacement file" + * instead of the file we're about to open. + */ + public char * +open_altfile(filename, pf, pfd) + char *filename; + int *pf; + void **pfd; +{ +#if !HAVE_POPEN + return (NULL); +#else + char *lessopen; + char *cmd; + int len; + FILE *fd; +#if HAVE_FILENO + int returnfd = 0; +#endif + + if (!use_lessopen || secure) + return (NULL); + ch_ungetchar(-1); + if ((lessopen = lgetenv("LESSOPEN")) == NULL) + return (NULL); + while (*lessopen == '|') + { + /* + * If LESSOPEN starts with a |, it indicates + * a "pipe preprocessor". + */ +#if !HAVE_FILENO + error("LESSOPEN pipe is not supported", NULL_PARG); + return (NULL); +#else + lessopen++; + returnfd++; +#endif + } + if (*lessopen == '-') { + /* + * Lessopen preprocessor will accept "-" as a filename. + */ + lessopen++; + } else { + if (strcmp(filename, "-") == 0) + return (NULL); + } + if (num_pct_s(lessopen) > 1) + { + error("Invalid LESSOPEN variable", NULL_PARG); + return (NULL); + } + + len = strlen(lessopen) + strlen(filename) + 2; + cmd = (char *) ecalloc(len, sizeof(char)); + SNPRINTF1(cmd, len, lessopen, filename); + fd = shellcmd(cmd); + free(cmd); + if (fd == NULL) + { + /* + * Cannot create the pipe. + */ + return (NULL); + } +#if HAVE_FILENO + if (returnfd) + { + int f; + char c; + + /* + * Read one char to see if the pipe will produce any data. + * If it does, push the char back on the pipe. + */ + f = fileno(fd); + SET_BINARY(f); + if (read(f, &c, 1) != 1) + { + /* + * Pipe is empty. + * If more than 1 pipe char was specified, + * the exit status tells whether the file itself + * is empty, or if there is no alt file. + * If only one pipe char, just assume no alt file. + */ + int status = pclose(fd); + if (returnfd > 1 && status == 0) { + *pfd = NULL; + *pf = -1; + return (save(FAKE_EMPTYFILE)); + } + return (NULL); + } + ch_ungetchar(c); + *pfd = (void *) fd; + *pf = f; + return (save("-")); + } +#endif + cmd = readfd(fd); + pclose(fd); + if (*cmd == '\0') + /* + * Pipe is empty. This means there is no alt file. + */ + return (NULL); + return (cmd); +#endif /* HAVE_POPEN */ +} + +/* + * Close a replacement file. + */ + public void +close_altfile(altfilename, filename, pipefd) + char *altfilename; + char *filename; + void *pipefd; +{ +#if HAVE_POPEN + char *lessclose; + FILE *fd; + char *cmd; + int len; + + if (secure) + return; + if (pipefd != NULL) + { +#if OS2 + /* + * The pclose function of OS/2 emx sometimes fails. + * Send SIGINT to the piped process before closing it. + */ + kill(((FILE*)pipefd)->_pid, SIGINT); +#endif + pclose((FILE*) pipefd); + } + if ((lessclose = lgetenv("LESSCLOSE")) == NULL) + return; + if (num_pct_s(lessclose) > 2) + { + error("Invalid LESSCLOSE variable"); + return; + } + len = strlen(lessclose) + strlen(filename) + strlen(altfilename) + 2; + cmd = (char *) ecalloc(len, sizeof(char)); + SNPRINTF2(cmd, len, lessclose, filename, altfilename); + fd = shellcmd(cmd); + free(cmd); + if (fd != NULL) + pclose(fd); +#endif +} + +/* + * Is the specified file a directory? + */ + public int +is_dir(filename) + char *filename; +{ + int isdir = 0; + + filename = shell_unquote(filename); +#if HAVE_STAT +{ + int r; + struct stat statbuf; + + r = stat(filename, &statbuf); + isdir = (r >= 0 && S_ISDIR(statbuf.st_mode)); +} +#else +#ifdef _OSK +{ + register int f; + + f = open(filename, S_IREAD | S_IFDIR); + if (f >= 0) + close(f); + isdir = (f >= 0); +} +#endif +#endif + free(filename); + return (isdir); +} + +/* + * Returns NULL if the file can be opened and + * is an ordinary file, otherwise an error message + * (if it cannot be opened or is a directory, etc.) + */ + public char * +bad_file(filename) + char *filename; +{ + register char *m = NULL; + + filename = shell_unquote(filename); + if (!force_open && is_dir(filename)) + { + static char is_a_dir[] = " is a directory"; + + m = (char *) ecalloc(strlen(filename) + sizeof(is_a_dir), + sizeof(char)); + strcpy(m, filename); + strcat(m, is_a_dir); + } else + { +#if HAVE_STAT + int r; + struct stat statbuf; + + r = stat(filename, &statbuf); + if (r < 0) + { + m = errno_message(filename); + } else if (force_open) + { + m = NULL; + } else if (!S_ISREG(statbuf.st_mode)) + { + static char not_reg[] = " is not a regular file (use -f to see it)"; + m = (char *) ecalloc(strlen(filename) + sizeof(not_reg), + sizeof(char)); + strcpy(m, filename); + strcat(m, not_reg); + } +#endif + } + free(filename); + return (m); +} + +/* + * Return the size of a file, as cheaply as possible. + * In Unix, we can stat the file. + */ + public POSITION +filesize(f) + int f; +{ +#if HAVE_STAT + struct stat statbuf; + + if (fstat(f, &statbuf) >= 0) + return ((POSITION) statbuf.st_size); +#else +#ifdef _OSK + long size; + + if ((size = (long) _gs_size(f)) >= 0) + return ((POSITION) size); +#endif +#endif + return (seek_filesize(f)); +} + +/* + * + */ + public char * +shell_coption() +{ + return ("-c"); +} + +/* + * Return last component of a pathname. + */ + public char * +last_component(name) + char *name; +{ + char *slash; + + for (slash = name + strlen(name); slash > name; ) + { + --slash; + if (*slash == *PATHNAME_SEP || *slash == '/') + return (slash + 1); + } + return (name); +} + |