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Diffstat (limited to 'gdb/command.c')
| -rw-r--r-- | gdb/command.c | 1564 |
1 files changed, 1564 insertions, 0 deletions
diff --git a/gdb/command.c b/gdb/command.c new file mode 100644 index 00000000000..58af56701f5 --- /dev/null +++ b/gdb/command.c @@ -0,0 +1,1564 @@ +/* Handle lists of commands, their decoding and documentation, for GDB. + Copyright 1986, 1989, 1990, 1991, 1998 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 of the License, 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; if not, write to the Free Software +Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ + +#include "defs.h" +#include "gdbcmd.h" +#include "symtab.h" +#include "value.h" +#include <ctype.h> +#include "gdb_string.h" +#ifdef HAVE_UNISTD_H +#include <unistd.h> +#endif + +#ifdef HAVE_WAIT_H +# include <wait.h> +#else +# ifdef HAVE_SYS_WAIT_H +# include <sys/wait.h> +# endif +#endif + +#include "wait.h" + +/* Prototypes for local functions */ + +static void undef_cmd_error PARAMS ((char *, char *)); + +static void show_user PARAMS ((char *, int)); + +static void show_user_1 PARAMS ((struct cmd_list_element *, GDB_FILE *)); + +static void make_command PARAMS ((char *, int)); + +static void shell_escape PARAMS ((char *, int)); + +static int parse_binary_operation PARAMS ((char *)); + +static void print_doc_line PARAMS ((GDB_FILE *, char *)); + +void _initialize_command PARAMS ((void)); + +/* Add element named NAME. + CLASS is the top level category into which commands are broken down + for "help" purposes. + FUN should be the function to execute the command; + it will get a character string as argument, with leading + and trailing blanks already eliminated. + + DOC is a documentation string for the command. + Its first line should be a complete sentence. + It should start with ? for a command that is an abbreviation + or with * for a command that most users don't need to know about. + + Add this command to command list *LIST. + + Returns a pointer to the added command (not necessarily the head + of *LIST). */ + +struct cmd_list_element * +add_cmd (name, class, fun, doc, list) + char *name; + enum command_class class; + void (*fun) PARAMS ((char *, int)); + char *doc; + struct cmd_list_element **list; +{ + register struct cmd_list_element *c + = (struct cmd_list_element *) xmalloc (sizeof (struct cmd_list_element)); + struct cmd_list_element *p; + + delete_cmd (name, list); + + if (*list == NULL || STRCMP ((*list)->name, name) >= 0) + { + c->next = *list; + *list = c; + } + else + { + p = *list; + while (p->next && STRCMP (p->next->name, name) <= 0) + { + p = p->next; + } + c->next = p->next; + p->next = c; + } + + c->name = name; + c->class = class; + c->function.cfunc = fun; + c->doc = doc; + c->hook = NULL; + c->prefixlist = NULL; + c->prefixname = NULL; + c->allow_unknown = 0; + c->abbrev_flag = 0; + c->completer = make_symbol_completion_list; + c->type = not_set_cmd; + c->var = NULL; + c->var_type = var_boolean; + c->enums = NULL; + c->user_commands = NULL; + c->hookee = NULL; + c->cmd_pointer = NULL; + + return c; +} + +/* Same as above, except that the abbrev_flag is set. */ + +#if 0 /* Currently unused */ + +struct cmd_list_element * +add_abbrev_cmd (name, class, fun, doc, list) + char *name; + enum command_class class; + void (*fun) PARAMS ((char *, int)); + char *doc; + struct cmd_list_element **list; +{ + register struct cmd_list_element *c + = add_cmd (name, class, fun, doc, list); + + c->abbrev_flag = 1; + return c; +} + +#endif + +struct cmd_list_element * +add_alias_cmd (name, oldname, class, abbrev_flag, list) + char *name; + char *oldname; + enum command_class class; + int abbrev_flag; + struct cmd_list_element **list; +{ + /* Must do this since lookup_cmd tries to side-effect its first arg */ + char *copied_name; + register struct cmd_list_element *old; + register struct cmd_list_element *c; + copied_name = (char *) alloca (strlen (oldname) + 1); + strcpy (copied_name, oldname); + old = lookup_cmd (&copied_name, *list, "", 1, 1); + + if (old == 0) + { + delete_cmd (name, list); + return 0; + } + + c = add_cmd (name, class, old->function.cfunc, old->doc, list); + c->prefixlist = old->prefixlist; + c->prefixname = old->prefixname; + c->allow_unknown = old->allow_unknown; + c->abbrev_flag = abbrev_flag; + c->cmd_pointer = old; + return c; +} + +/* Like add_cmd but adds an element for a command prefix: + a name that should be followed by a subcommand to be looked up + in another command list. PREFIXLIST should be the address + of the variable containing that list. */ + +struct cmd_list_element * +add_prefix_cmd (name, class, fun, doc, prefixlist, prefixname, + allow_unknown, list) + char *name; + enum command_class class; + void (*fun) PARAMS ((char *, int)); + char *doc; + struct cmd_list_element **prefixlist; + char *prefixname; + int allow_unknown; + struct cmd_list_element **list; +{ + register struct cmd_list_element *c = add_cmd (name, class, fun, doc, list); + c->prefixlist = prefixlist; + c->prefixname = prefixname; + c->allow_unknown = allow_unknown; + return c; +} + +/* Like add_prefix_cmd but sets the abbrev_flag on the new command. */ + +struct cmd_list_element * +add_abbrev_prefix_cmd (name, class, fun, doc, prefixlist, prefixname, + allow_unknown, list) + char *name; + enum command_class class; + void (*fun) PARAMS ((char *, int)); + char *doc; + struct cmd_list_element **prefixlist; + char *prefixname; + int allow_unknown; + struct cmd_list_element **list; +{ + register struct cmd_list_element *c = add_cmd (name, class, fun, doc, list); + c->prefixlist = prefixlist; + c->prefixname = prefixname; + c->allow_unknown = allow_unknown; + c->abbrev_flag = 1; + return c; +} + +/* This is an empty "cfunc". */ +void +not_just_help_class_command (args, from_tty) + char *args; + int from_tty; +{ +} + +/* This is an empty "sfunc". */ +static void empty_sfunc PARAMS ((char *, int, struct cmd_list_element *)); + +static void +empty_sfunc (args, from_tty, c) + char *args; + int from_tty; + struct cmd_list_element *c; +{ +} + +/* Add element named NAME to command list LIST (the list for set + or some sublist thereof). + CLASS is as in add_cmd. + VAR_TYPE is the kind of thing we are setting. + VAR is address of the variable being controlled by this command. + DOC is the documentation string. */ + +struct cmd_list_element * +add_set_cmd (name, class, var_type, var, doc, list) + char *name; + enum command_class class; + var_types var_type; + char *var; + char *doc; + struct cmd_list_element **list; +{ + struct cmd_list_element *c + = add_cmd (name, class, NO_FUNCTION, doc, list); + + c->type = set_cmd; + c->var_type = var_type; + c->var = var; + /* This needs to be something besides NO_FUNCTION so that this isn't + treated as a help class. */ + c->function.sfunc = empty_sfunc; + return c; +} + +/* Add element named NAME to command list LIST (the list for set + or some sublist thereof). + CLASS is as in add_cmd. + ENUMLIST is a list of strings which may follow NAME. + VAR is address of the variable which will contain the matching string + (from ENUMLIST). + DOC is the documentation string. */ + +struct cmd_list_element * +add_set_enum_cmd (name, class, enumlist, var, doc, list) + char *name; + enum command_class class; + char *enumlist[]; + char *var; + char *doc; + struct cmd_list_element **list; +{ + struct cmd_list_element *c + = add_set_cmd (name, class, var_enum, var, doc, list); + c->enums = enumlist; + + return c; +} + +/* Where SETCMD has already been added, add the corresponding show + command to LIST and return a pointer to the added command (not + necessarily the head of LIST). */ +struct cmd_list_element * +add_show_from_set (setcmd, list) + struct cmd_list_element *setcmd; + struct cmd_list_element **list; +{ + struct cmd_list_element *showcmd = + (struct cmd_list_element *) xmalloc (sizeof (struct cmd_list_element)); + struct cmd_list_element *p; + + memcpy (showcmd, setcmd, sizeof (struct cmd_list_element)); + delete_cmd (showcmd->name, list); + showcmd->type = show_cmd; + + /* Replace "set " at start of docstring with "show ". */ + if (setcmd->doc[0] == 'S' && setcmd->doc[1] == 'e' + && setcmd->doc[2] == 't' && setcmd->doc[3] == ' ') + showcmd->doc = concat ("Show ", setcmd->doc + 4, NULL); + else + fprintf_unfiltered (gdb_stderr, "GDB internal error: Bad docstring for set command\n"); + + if (*list == NULL || STRCMP ((*list)->name, showcmd->name) >= 0) + { + showcmd->next = *list; + *list = showcmd; + } + else + { + p = *list; + while (p->next && STRCMP (p->next->name, showcmd->name) <= 0) + { + p = p->next; + } + showcmd->next = p->next; + p->next = showcmd; + } + + return showcmd; +} + +/* Remove the command named NAME from the command list. */ + +void +delete_cmd (name, list) + char *name; + struct cmd_list_element **list; +{ + register struct cmd_list_element *c; + struct cmd_list_element *p; + + while (*list && STREQ ((*list)->name, name)) + { + if ((*list)->hookee) + (*list)->hookee->hook = 0; /* Hook slips out of its mouth */ + p = (*list)->next; + free ((PTR)*list); + *list = p; + } + + if (*list) + for (c = *list; c->next;) + { + if (STREQ (c->next->name, name)) + { + if (c->next->hookee) + c->next->hookee->hook = 0; /* hooked cmd gets away. */ + p = c->next->next; + free ((PTR)c->next); + c->next = p; + } + else + c = c->next; + } +} + +/* This command really has to deal with two things: + * 1) I want documentation on *this string* (usually called by + * "help commandname"). + * 2) I want documentation on *this list* (usually called by + * giving a command that requires subcommands. Also called by saying + * just "help".) + * + * I am going to split this into two seperate comamnds, help_cmd and + * help_list. + */ + +void +help_cmd (command, stream) + char *command; + GDB_FILE *stream; +{ + struct cmd_list_element *c; + extern struct cmd_list_element *cmdlist; + + if (!command) + { + help_list (cmdlist, "", all_classes, stream); + return; + } + + c = lookup_cmd (&command, cmdlist, "", 0, 0); + + if (c == 0) + return; + + /* There are three cases here. + If c->prefixlist is nonzero, we have a prefix command. + Print its documentation, then list its subcommands. + + If c->function is nonzero, we really have a command. + Print its documentation and return. + + If c->function is zero, we have a class name. + Print its documentation (as if it were a command) + and then set class to the number of this class + so that the commands in the class will be listed. */ + + fputs_filtered (c->doc, stream); + fputs_filtered ("\n", stream); + + if (c->prefixlist == 0 && c->function.cfunc != NULL) + return; + fprintf_filtered (stream, "\n"); + + /* If this is a prefix command, print it's subcommands */ + if (c->prefixlist) + help_list (*c->prefixlist, c->prefixname, all_commands, stream); + + /* If this is a class name, print all of the commands in the class */ + if (c->function.cfunc == NULL) + help_list (cmdlist, "", c->class, stream); + + if (c->hook) + fprintf_filtered (stream, "\nThis command has a hook defined: %s\n", + c->hook->name); +} + +/* + * Get a specific kind of help on a command list. + * + * LIST is the list. + * CMDTYPE is the prefix to use in the title string. + * CLASS is the class with which to list the nodes of this list (see + * documentation for help_cmd_list below), As usual, ALL_COMMANDS for + * everything, ALL_CLASSES for just classes, and non-negative for only things + * in a specific class. + * and STREAM is the output stream on which to print things. + * If you call this routine with a class >= 0, it recurses. + */ +void +help_list (list, cmdtype, class, stream) + struct cmd_list_element *list; + char *cmdtype; + enum command_class class; + GDB_FILE *stream; +{ + int len; + char *cmdtype1, *cmdtype2; + + /* If CMDTYPE is "foo ", CMDTYPE1 gets " foo" and CMDTYPE2 gets "foo sub" */ + len = strlen (cmdtype); + cmdtype1 = (char *) alloca (len + 1); + cmdtype1[0] = 0; + cmdtype2 = (char *) alloca (len + 4); + cmdtype2[0] = 0; + if (len) + { + cmdtype1[0] = ' '; + strncpy (cmdtype1 + 1, cmdtype, len - 1); + cmdtype1[len] = 0; + strncpy (cmdtype2, cmdtype, len - 1); + strcpy (cmdtype2 + len - 1, " sub"); + } + + if (class == all_classes) + fprintf_filtered (stream, "List of classes of %scommands:\n\n", cmdtype2); + else + fprintf_filtered (stream, "List of %scommands:\n\n", cmdtype2); + + help_cmd_list (list, class, cmdtype, (int)class >= 0, stream); + + if (class == all_classes) + fprintf_filtered (stream, "\n\ +Type \"help%s\" followed by a class name for a list of commands in that class.", + cmdtype1); + + fprintf_filtered (stream, "\n\ +Type \"help%s\" followed by %scommand name for full documentation.\n\ +Command name abbreviations are allowed if unambiguous.\n", + cmdtype1, cmdtype2); +} + +/* Print only the first line of STR on STREAM. */ +static void +print_doc_line (stream, str) + GDB_FILE *stream; + char *str; +{ + static char *line_buffer = 0; + static int line_size; + register char *p; + + if (!line_buffer) + { + line_size = 80; + line_buffer = (char *) xmalloc (line_size); + } + + p = str; + while (*p && *p != '\n' && *p != '.' && *p != ',') + p++; + if (p - str > line_size - 1) + { + line_size = p - str + 1; + free ((PTR)line_buffer); + line_buffer = (char *) xmalloc (line_size); + } + strncpy (line_buffer, str, p - str); + line_buffer[p - str] = '\0'; + if (islower (line_buffer[0])) + line_buffer[0] = toupper (line_buffer[0]); + fputs_filtered (line_buffer, stream); +} + +/* + * Implement a help command on command list LIST. + * RECURSE should be non-zero if this should be done recursively on + * all sublists of LIST. + * PREFIX is the prefix to print before each command name. + * STREAM is the stream upon which the output should be written. + * CLASS should be: + * A non-negative class number to list only commands in that + * class. + * ALL_COMMANDS to list all commands in list. + * ALL_CLASSES to list all classes in list. + * + * Note that RECURSE will be active on *all* sublists, not just the + * ones selected by the criteria above (ie. the selection mechanism + * is at the low level, not the high-level). + */ +void +help_cmd_list (list, class, prefix, recurse, stream) + struct cmd_list_element *list; + enum command_class class; + char *prefix; + int recurse; + GDB_FILE *stream; +{ + register struct cmd_list_element *c; + + for (c = list; c; c = c->next) + { + if (c->abbrev_flag == 0 && + (class == all_commands + || (class == all_classes && c->function.cfunc == NULL) + || (class == c->class && c->function.cfunc != NULL))) + { + fprintf_filtered (stream, "%s%s -- ", prefix, c->name); + print_doc_line (stream, c->doc); + fputs_filtered ("\n", stream); + } + if (recurse + && c->prefixlist != 0 + && c->abbrev_flag == 0) + help_cmd_list (*c->prefixlist, class, c->prefixname, 1, stream); + } +} + + +/* Search the input clist for 'command'. Return the command if + found (or NULL if not), and return the number of commands + found in nfound */ + +static struct cmd_list_element * +find_cmd(command, len, clist, ignore_help_classes, nfound) + char *command; + struct cmd_list_element *clist; + int ignore_help_classes; + int *nfound; +{ + struct cmd_list_element *found, *c; + + found = (struct cmd_list_element *)NULL; + *nfound = 0; + for (c = clist; c; c = c->next) + if (!strncmp (command, c->name, len) + && (!ignore_help_classes || c->function.cfunc)) + { + found = c; + (*nfound)++; + if (c->name[len] == '\0') + { + *nfound = 1; + break; + } + } + return found; +} + +/* This routine takes a line of TEXT and a CLIST in which to start the + lookup. When it returns it will have incremented the text pointer past + the section of text it matched, set *RESULT_LIST to point to the list in + which the last word was matched, and will return a pointer to the cmd + list element which the text matches. It will return NULL if no match at + all was possible. It will return -1 (cast appropriately, ick) if ambigous + matches are possible; in this case *RESULT_LIST will be set to point to + the list in which there are ambiguous choices (and *TEXT will be set to + the ambiguous text string). + + If the located command was an abbreviation, this routine returns the base + command of the abbreviation. + + It does no error reporting whatsoever; control will always return + to the superior routine. + + In the case of an ambiguous return (-1), *RESULT_LIST will be set to point + at the prefix_command (ie. the best match) *or* (special case) will be NULL + if no prefix command was ever found. For example, in the case of "info a", + "info" matches without ambiguity, but "a" could be "args" or "address", so + *RESULT_LIST is set to the cmd_list_element for "info". So in this case + RESULT_LIST should not be interpeted as a pointer to the beginning of a + list; it simply points to a specific command. In the case of an ambiguous + return *TEXT is advanced past the last non-ambiguous prefix (e.g. + "info t" can be "info types" or "info target"; upon return *TEXT has been + advanced past "info "). + + If RESULT_LIST is NULL, don't set *RESULT_LIST (but don't otherwise + affect the operation). + + This routine does *not* modify the text pointed to by TEXT. + + If IGNORE_HELP_CLASSES is nonzero, ignore any command list elements which + are actually help classes rather than commands (i.e. the function field of + the struct cmd_list_element is NULL). */ + +struct cmd_list_element * +lookup_cmd_1 (text, clist, result_list, ignore_help_classes) + char **text; + struct cmd_list_element *clist, **result_list; + int ignore_help_classes; +{ + char *p, *command; + int len, tmp, nfound; + struct cmd_list_element *found, *c; + + while (**text == ' ' || **text == '\t') + (*text)++; + + /* Treating underscores as part of command words is important + so that "set args_foo()" doesn't get interpreted as + "set args _foo()". */ + for (p = *text; + *p && (isalnum(*p) || *p == '-' || *p == '_' || + (tui_version && + (*p == '+' || *p == '<' || *p == '>' || *p == '$')) || + (xdb_commands && (*p == '!' || *p == '/' || *p == '?'))); + p++) + ; + + /* If nothing but whitespace, return 0. */ + if (p == *text) + return 0; + + len = p - *text; + + /* *text and p now bracket the first command word to lookup (and + it's length is len). We copy this into a local temporary */ + + + command = (char *) alloca (len + 1); + for (tmp = 0; tmp < len; tmp++) + { + char x = (*text)[tmp]; + command[tmp] = x; + } + command[len] = '\0'; + + /* Look it up. */ + found = 0; + nfound = 0; + found = find_cmd(command, len, clist, ignore_help_classes, &nfound); + + /* + ** We didn't find the command in the entered case, so lower case it + ** and search again. + */ + if (!found || nfound == 0) + { + for (tmp = 0; tmp < len; tmp++) + { + char x = command[tmp]; + command[tmp] = isupper(x) ? tolower(x) : x; + } + found = find_cmd(command, len, clist, ignore_help_classes, &nfound); + } + + /* If nothing matches, we have a simple failure. */ + if (nfound == 0) + return 0; + + if (nfound > 1) + { + if (result_list != NULL) + /* Will be modified in calling routine + if we know what the prefix command is. */ + *result_list = 0; + return (struct cmd_list_element *) -1; /* Ambiguous. */ + } + + /* We've matched something on this list. Move text pointer forward. */ + + *text = p; + + /* If this was an abbreviation, use the base command instead. */ + + if (found->cmd_pointer) + found = found->cmd_pointer; + + /* If we found a prefix command, keep looking. */ + + if (found->prefixlist) + { + c = lookup_cmd_1 (text, *found->prefixlist, result_list, + ignore_help_classes); + if (!c) + { + /* Didn't find anything; this is as far as we got. */ + if (result_list != NULL) + *result_list = clist; + return found; + } + else if (c == (struct cmd_list_element *) -1) + { + /* We've gotten this far properly, but the next step + is ambiguous. We need to set the result list to the best + we've found (if an inferior hasn't already set it). */ + if (result_list != NULL) + if (!*result_list) + /* This used to say *result_list = *found->prefixlist + If that was correct, need to modify the documentation + at the top of this function to clarify what is supposed + to be going on. */ + *result_list = found; + return c; + } + else + { + /* We matched! */ + return c; + } + } + else + { + if (result_list != NULL) + *result_list = clist; + return found; + } +} + +/* All this hair to move the space to the front of cmdtype */ + +static void +undef_cmd_error (cmdtype, q) + char *cmdtype, *q; +{ + error ("Undefined %scommand: \"%s\". Try \"help%s%.*s\".", + cmdtype, + q, + *cmdtype? " ": "", + strlen(cmdtype)-1, + cmdtype); +} + +/* Look up the contents of *LINE as a command in the command list LIST. + LIST is a chain of struct cmd_list_element's. + If it is found, return the struct cmd_list_element for that command + and update *LINE to point after the command name, at the first argument. + If not found, call error if ALLOW_UNKNOWN is zero + otherwise (or if error returns) return zero. + Call error if specified command is ambiguous, + unless ALLOW_UNKNOWN is negative. + CMDTYPE precedes the word "command" in the error message. + + If INGNORE_HELP_CLASSES is nonzero, ignore any command list + elements which are actually help classes rather than commands (i.e. + the function field of the struct cmd_list_element is 0). */ + +struct cmd_list_element * +lookup_cmd (line, list, cmdtype, allow_unknown, ignore_help_classes) + char **line; + struct cmd_list_element *list; + char *cmdtype; + int allow_unknown; + int ignore_help_classes; +{ + struct cmd_list_element *last_list = 0; + struct cmd_list_element *c = + lookup_cmd_1 (line, list, &last_list, ignore_help_classes); +#if 0 + /* This is wrong for complete_command. */ + char *ptr = (*line) + strlen (*line) - 1; + + /* Clear off trailing whitespace. */ + while (ptr >= *line && (*ptr == ' ' || *ptr == '\t')) + ptr--; + *(ptr + 1) = '\0'; +#endif + + if (!c) + { + if (!allow_unknown) + { + if (!*line) + error ("Lack of needed %scommand", cmdtype); + else + { + char *p = *line, *q; + + while (isalnum(*p) || *p == '-') + p++; + + q = (char *) alloca (p - *line + 1); + strncpy (q, *line, p - *line); + q[p - *line] = '\0'; + undef_cmd_error (cmdtype, q); + } + } + else + return 0; + } + else if (c == (struct cmd_list_element *) -1) + { + /* Ambigous. Local values should be off prefixlist or called + values. */ + int local_allow_unknown = (last_list ? last_list->allow_unknown : + allow_unknown); + char *local_cmdtype = last_list ? last_list->prefixname : cmdtype; + struct cmd_list_element *local_list = + (last_list ? *(last_list->prefixlist) : list); + + if (local_allow_unknown < 0) + { + if (last_list) + return last_list; /* Found something. */ + else + return 0; /* Found nothing. */ + } + else + { + /* Report as error. */ + int amb_len; + char ambbuf[100]; + + for (amb_len = 0; + ((*line)[amb_len] && (*line)[amb_len] != ' ' + && (*line)[amb_len] != '\t'); + amb_len++) + ; + + ambbuf[0] = 0; + for (c = local_list; c; c = c->next) + if (!strncmp (*line, c->name, amb_len)) + { + if (strlen (ambbuf) + strlen (c->name) + 6 < (int)sizeof ambbuf) + { + if (strlen (ambbuf)) + strcat (ambbuf, ", "); + strcat (ambbuf, c->name); + } + else + { + strcat (ambbuf, ".."); + break; + } + } + error ("Ambiguous %scommand \"%s\": %s.", local_cmdtype, + *line, ambbuf); + return 0; /* lint */ + } + } + else + { + /* We've got something. It may still not be what the caller + wants (if this command *needs* a subcommand). */ + while (**line == ' ' || **line == '\t') + (*line)++; + + if (c->prefixlist && **line && !c->allow_unknown) + undef_cmd_error (c->prefixname, *line); + + /* Seems to be what he wants. Return it. */ + return c; + } + return 0; +} + +#if 0 +/* Look up the contents of *LINE as a command in the command list LIST. + LIST is a chain of struct cmd_list_element's. + If it is found, return the struct cmd_list_element for that command + and update *LINE to point after the command name, at the first argument. + If not found, call error if ALLOW_UNKNOWN is zero + otherwise (or if error returns) return zero. + Call error if specified command is ambiguous, + unless ALLOW_UNKNOWN is negative. + CMDTYPE precedes the word "command" in the error message. */ + +struct cmd_list_element * +lookup_cmd (line, list, cmdtype, allow_unknown) + char **line; + struct cmd_list_element *list; + char *cmdtype; + int allow_unknown; +{ + register char *p; + register struct cmd_list_element *c, *found; + int nfound; + char ambbuf[100]; + char *processed_cmd; + int i, cmd_len; + + /* Skip leading whitespace. */ + + while (**line == ' ' || **line == '\t') + (*line)++; + + /* Clear out trailing whitespace. */ + + p = *line + strlen (*line); + while (p != *line && (p[-1] == ' ' || p[-1] == '\t')) + p--; + *p = 0; + + /* Find end of command name. */ + + p = *line; + while (*p == '-' || isalnum(*p)) + p++; + + /* Look up the command name. + If exact match, keep that. + Otherwise, take command abbreviated, if unique. Note that (in my + opinion) a null string does *not* indicate ambiguity; simply the + end of the argument. */ + + if (p == *line) + { + if (!allow_unknown) + error ("Lack of needed %scommand", cmdtype); + return 0; + } + + /* Copy over to a local buffer, converting to lowercase on the way. + This is in case the command being parsed is a subcommand which + doesn't match anything, and that's ok. We want the original + untouched for the routine of the original command. */ + + processed_cmd = (char *) alloca (p - *line + 1); + for (cmd_len = 0; cmd_len < p - *line; cmd_len++) + { + char x = (*line)[cmd_len]; + if (isupper(x)) + processed_cmd[cmd_len] = tolower(x); + else + processed_cmd[cmd_len] = x; + } + processed_cmd[cmd_len] = '\0'; + + /* Check all possibilities in the current command list. */ + found = 0; + nfound = 0; + for (c = list; c; c = c->next) + { + if (!strncmp (processed_cmd, c->name, cmd_len)) + { + found = c; + nfound++; + if (c->name[cmd_len] == 0) + { + nfound = 1; + break; + } + } + } + + /* Report error for undefined command name. */ + + if (nfound != 1) + { + if (nfound > 1 && allow_unknown >= 0) + { + ambbuf[0] = 0; + for (c = list; c; c = c->next) + if (!strncmp (processed_cmd, c->name, cmd_len)) + { + if (strlen (ambbuf) + strlen (c->name) + 6 < sizeof ambbuf) + { + if (strlen (ambbuf)) + strcat (ambbuf, ", "); + strcat (ambbuf, c->name); + } + else + { + strcat (ambbuf, ".."); + break; + } + } + error ("Ambiguous %scommand \"%s\": %s.", cmdtype, + processed_cmd, ambbuf); + } + else if (!allow_unknown) + error ("Undefined %scommand: \"%s\".", cmdtype, processed_cmd); + return 0; + } + + /* Skip whitespace before the argument. */ + + while (*p == ' ' || *p == '\t') p++; + *line = p; + + if (found->prefixlist && *p) + { + c = lookup_cmd (line, *found->prefixlist, found->prefixname, + found->allow_unknown); + if (c) + return c; + } + + return found; +} +#endif + +/* Helper function for SYMBOL_COMPLETION_FUNCTION. */ + +/* Return a vector of char pointers which point to the different + possible completions in LIST of TEXT. + + WORD points in the same buffer as TEXT, and completions should be + returned relative to this position. For example, suppose TEXT is "foo" + and we want to complete to "foobar". If WORD is "oo", return + "oobar"; if WORD is "baz/foo", return "baz/foobar". */ + +char ** +complete_on_cmdlist (list, text, word) + struct cmd_list_element *list; + char *text; + char *word; +{ + struct cmd_list_element *ptr; + char **matchlist; + int sizeof_matchlist; + int matches; + int textlen = strlen (text); + + sizeof_matchlist = 10; + matchlist = (char **) xmalloc (sizeof_matchlist * sizeof (char *)); + matches = 0; + + for (ptr = list; ptr; ptr = ptr->next) + if (!strncmp (ptr->name, text, textlen) + && !ptr->abbrev_flag + && (ptr->function.cfunc + || ptr->prefixlist)) + { + if (matches == sizeof_matchlist) + { + sizeof_matchlist *= 2; + matchlist = (char **) xrealloc ((char *)matchlist, + (sizeof_matchlist + * sizeof (char *))); + } + + matchlist[matches] = (char *) + xmalloc (strlen (word) + strlen (ptr->name) + 1); + if (word == text) + strcpy (matchlist[matches], ptr->name); + else if (word > text) + { + /* Return some portion of ptr->name. */ + strcpy (matchlist[matches], ptr->name + (word - text)); + } + else + { + /* Return some of text plus ptr->name. */ + strncpy (matchlist[matches], word, text - word); + matchlist[matches][text - word] = '\0'; + strcat (matchlist[matches], ptr->name); + } + ++matches; + } + + if (matches == 0) + { + free ((PTR)matchlist); + matchlist = 0; + } + else + { + matchlist = (char **) xrealloc ((char *)matchlist, ((matches + 1) + * sizeof (char *))); + matchlist[matches] = (char *) 0; + } + + return matchlist; +} + +/* Helper function for SYMBOL_COMPLETION_FUNCTION. */ + +/* Return a vector of char pointers which point to the different + possible completions in CMD of TEXT. + + WORD points in the same buffer as TEXT, and completions should be + returned relative to this position. For example, suppose TEXT is "foo" + and we want to complete to "foobar". If WORD is "oo", return + "oobar"; if WORD is "baz/foo", return "baz/foobar". */ + +char ** +complete_on_enum (enumlist, text, word) + char **enumlist; + char *text; + char *word; +{ + char **matchlist; + int sizeof_matchlist; + int matches; + int textlen = strlen (text); + int i; + char *name; + + sizeof_matchlist = 10; + matchlist = (char **) xmalloc (sizeof_matchlist * sizeof (char *)); + matches = 0; + + for (i = 0; (name = enumlist[i]) != NULL; i++) + if (strncmp (name, text, textlen) == 0) + { + if (matches == sizeof_matchlist) + { + sizeof_matchlist *= 2; + matchlist = (char **) xrealloc ((char *)matchlist, + (sizeof_matchlist + * sizeof (char *))); + } + + matchlist[matches] = (char *) + xmalloc (strlen (word) + strlen (name) + 1); + if (word == text) + strcpy (matchlist[matches], name); + else if (word > text) + { + /* Return some portion of name. */ + strcpy (matchlist[matches], name + (word - text)); + } + else + { + /* Return some of text plus name. */ + strncpy (matchlist[matches], word, text - word); + matchlist[matches][text - word] = '\0'; + strcat (matchlist[matches], name); + } + ++matches; + } + + if (matches == 0) + { + free ((PTR)matchlist); + matchlist = 0; + } + else + { + matchlist = (char **) xrealloc ((char *)matchlist, ((matches + 1) + * sizeof (char *))); + matchlist[matches] = (char *) 0; + } + + return matchlist; +} + +static int +parse_binary_operation (arg) + char *arg; +{ + int length; + + if (!arg || !*arg) + return 1; + + length = strlen (arg); + + while (arg[length - 1] == ' ' || arg[length - 1] == '\t') + length--; + + if (!strncmp (arg, "on", length) + || !strncmp (arg, "1", length) + || !strncmp (arg, "yes", length)) + return 1; + else + if (!strncmp (arg, "off", length) + || !strncmp (arg, "0", length) + || !strncmp (arg, "no", length)) + return 0; + else + { + error ("\"on\" or \"off\" expected."); + return 0; + } +} + +/* Do a "set" or "show" command. ARG is NULL if no argument, or the text + of the argument, and FROM_TTY is nonzero if this command is being entered + directly by the user (i.e. these are just like any other + command). C is the command list element for the command. */ +void +do_setshow_command (arg, from_tty, c) + char *arg; + int from_tty; + struct cmd_list_element *c; +{ + if (c->type == set_cmd) + { + switch (c->var_type) + { + case var_string: + { + char *new; + char *p; + char *q; + int ch; + + if (arg == NULL) + arg = ""; + new = (char *) xmalloc (strlen (arg) + 2); + p = arg; q = new; + while ((ch = *p++) != '\000') + { + if (ch == '\\') + { + /* \ at end of argument is used after spaces + so they won't be lost. */ + /* This is obsolete now that we no longer strip + trailing whitespace and actually, the backslash + didn't get here in my test, readline or + something did something funky with a backslash + right before a newline. */ + if (*p == 0) + break; + ch = parse_escape (&p); + if (ch == 0) + break; /* C loses */ + else if (ch > 0) + *q++ = ch; + } + else + *q++ = ch; + } +#if 0 + if (*(p - 1) != '\\') + *q++ = ' '; +#endif + *q++ = '\0'; + new = (char *) xrealloc (new, q - new); + if (*(char **)c->var != NULL) + free (*(char **)c->var); + *(char **) c->var = new; + } + break; + case var_string_noescape: + if (arg == NULL) + arg = ""; + if (*(char **)c->var != NULL) + free (*(char **)c->var); + *(char **) c->var = savestring (arg, strlen (arg)); + break; + case var_filename: + if (arg == NULL) + error_no_arg ("filename to set it to."); + if (*(char **)c->var != NULL) + free (*(char **)c->var); + *(char **)c->var = tilde_expand (arg); + break; + case var_boolean: + *(int *) c->var = parse_binary_operation (arg); + break; + case var_uinteger: + if (arg == NULL) + error_no_arg ("integer to set it to."); + *(unsigned int *) c->var = parse_and_eval_address (arg); + if (*(unsigned int *) c->var == 0) + *(unsigned int *) c->var = UINT_MAX; + break; + case var_integer: + { + unsigned int val; + if (arg == NULL) + error_no_arg ("integer to set it to."); + val = parse_and_eval_address (arg); + if (val == 0) + *(int *) c->var = INT_MAX; + else if (val >= INT_MAX) + error ("integer %u out of range", val); + else + *(int *) c->var = val; + break; + } + case var_zinteger: + if (arg == NULL) + error_no_arg ("integer to set it to."); + *(int *) c->var = parse_and_eval_address (arg); + break; + case var_enum: + { + int i; + int len; + int nmatches; + char *match = NULL; + char *p; + + /* if no argument was supplied, print an informative error message */ + if (arg == NULL) + { + char msg[1024]; + strcpy (msg, "Requires an argument. Valid arguments are "); + for (i = 0; c->enums[i]; i++) + { + if (i != 0) + strcat (msg, ", "); + strcat (msg, c->enums[i]); + } + strcat (msg, "."); + error (msg); + } + + p = strchr (arg, ' '); + + if (p) + len = p - arg; + else + len = strlen (arg); + + nmatches = 0; + for (i = 0; c->enums[i]; i++) + if (strncmp (arg, c->enums[i], len) == 0) + { + match = c->enums[i]; + nmatches++; + } + + if (nmatches <= 0) + error ("Undefined item: \"%s\".", arg); + + if (nmatches > 1) + error ("Ambiguous item \"%s\".", arg); + + *(char **)c->var = match; + } + break; + default: + error ("gdb internal error: bad var_type in do_setshow_command"); + } + } + else if (c->type == show_cmd) + { + /* Print doc minus "show" at start. */ + print_doc_line (gdb_stdout, c->doc + 5); + + fputs_filtered (" is ", gdb_stdout); + wrap_here (" "); + switch (c->var_type) + { + case var_string: + { + unsigned char *p; + + fputs_filtered ("\"", gdb_stdout); + if (*(unsigned char **)c->var) + for (p = *(unsigned char **) c->var; *p != '\0'; p++) + gdb_printchar (*p, gdb_stdout, '"'); + fputs_filtered ("\"", gdb_stdout); + } + break; + case var_string_noescape: + case var_filename: + case var_enum: + fputs_filtered ("\"", gdb_stdout); + if (*(char **)c->var) + fputs_filtered (*(char **) c->var, gdb_stdout); + fputs_filtered ("\"", gdb_stdout); + break; + case var_boolean: + fputs_filtered (*(int *) c->var ? "on" : "off", gdb_stdout); + break; + case var_uinteger: + if (*(unsigned int *) c->var == UINT_MAX) { + fputs_filtered ("unlimited", gdb_stdout); + break; + } + /* else fall through */ + case var_zinteger: + fprintf_filtered (gdb_stdout, "%u", *(unsigned int *) c->var); + break; + case var_integer: + if (*(int *) c->var == INT_MAX) + { + fputs_filtered ("unlimited", gdb_stdout); + } + else + fprintf_filtered (gdb_stdout, "%d", *(int *) c->var); + break; + + default: + error ("gdb internal error: bad var_type in do_setshow_command"); + } + fputs_filtered (".\n", gdb_stdout); + } + else + error ("gdb internal error: bad cmd_type in do_setshow_command"); + (*c->function.sfunc) (NULL, from_tty, c); +} + +/* Show all the settings in a list of show commands. */ + +void +cmd_show_list (list, from_tty, prefix) + struct cmd_list_element *list; + int from_tty; + char *prefix; +{ + for (; list != NULL; list = list->next) { + /* If we find a prefix, run its list, prefixing our output by its + prefix (with "show " skipped). */ + if (list->prefixlist && !list->abbrev_flag) + cmd_show_list (*list->prefixlist, from_tty, list->prefixname + 5); + if (list->type == show_cmd) + { + fputs_filtered (prefix, gdb_stdout); + fputs_filtered (list->name, gdb_stdout); + fputs_filtered (": ", gdb_stdout); + do_setshow_command ((char *)NULL, from_tty, list); + } + } +} + +/* ARGSUSED */ +static void +shell_escape (arg, from_tty) + char *arg; + int from_tty; +{ +#ifdef CANT_FORK + /* FIXME: what about errors (I don't know how GO32 system() handles + them)? */ + system (arg); +#else /* Can fork. */ + int rc, status, pid; + char *p, *user_shell; + + if ((user_shell = (char *) getenv ("SHELL")) == NULL) + user_shell = "/bin/sh"; + + /* Get the name of the shell for arg0 */ + if ((p = strrchr (user_shell, '/')) == NULL) + p = user_shell; + else + p++; /* Get past '/' */ + + if ((pid = fork()) == 0) + { + if (!arg) + execl (user_shell, p, 0); + else + execl (user_shell, p, "-c", arg, 0); + + fprintf_unfiltered (gdb_stderr, "Cannot execute %s: %s\n", user_shell, + safe_strerror (errno)); + gdb_flush (gdb_stderr); + _exit (0177); + } + + if (pid != -1) + while ((rc = wait (&status)) != pid && rc != -1) + ; + else + error ("Fork failed"); +#endif /* Can fork. */ +} + +static void +make_command (arg, from_tty) + char *arg; + int from_tty; +{ + char *p; + + if (arg == 0) + p = "make"; + else + { + p = xmalloc (sizeof("make ") + strlen(arg)); + strcpy (p, "make "); + strcpy (p + sizeof("make ")-1, arg); + } + + shell_escape (p, from_tty); +} + +static void +show_user_1 (c, stream) + struct cmd_list_element *c; + GDB_FILE *stream; +{ + register struct command_line *cmdlines; + + cmdlines = c->user_commands; + if (!cmdlines) + return; + fputs_filtered ("User command ", stream); + fputs_filtered (c->name, stream); + fputs_filtered (":\n", stream); + + while (cmdlines) + { + print_command_line (cmdlines, 4); + cmdlines = cmdlines->next; + } + fputs_filtered ("\n", stream); +} + +/* ARGSUSED */ +static void +show_user (args, from_tty) + char *args; + int from_tty; +{ + struct cmd_list_element *c; + extern struct cmd_list_element *cmdlist; + + if (args) + { + c = lookup_cmd (&args, cmdlist, "", 0, 1); + if (c->class != class_user) + error ("Not a user command."); + show_user_1 (c, gdb_stdout); + } + else + { + for (c = cmdlist; c; c = c->next) + { + if (c->class == class_user) + show_user_1 (c, gdb_stdout); + } + } +} + +void +_initialize_command () +{ + add_com ("shell", class_support, shell_escape, + "Execute the rest of the line as a shell command. \n\ +With no arguments, run an inferior shell."); + + if (xdb_commands) + add_com_alias("!", "shell", class_support, 0); + + add_com ("make", class_support, make_command, + "Run the ``make'' program using the rest of the line as arguments."); + add_cmd ("user", no_class, show_user, + "Show definitions of user defined commands.\n\ +Argument is the name of the user defined command.\n\ +With no argument, show definitions of all user defined commands.", &showlist); +} |