+/* Library for reading command lines and decoding commands.
+ Copyright (C) 1986, 1989 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 1, 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., 675 Mass Ave, Cambridge, MA 02139, USA. */
+
+#include "command.h"
+#include "defs.h"
+#include <stdio.h>
+#include <ctype.h>
+
+extern char *xmalloc ();
+
+/* Add element named NAME to command list *LIST.
+ 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. */
+
+struct cmd_list_element *
+add_cmd (name, class, fun, doc, list)
+ char *name;
+ int class;
+ void (*fun) ();
+ char *doc;
+ struct cmd_list_element **list;
+{
+ register struct cmd_list_element *c
+ = (struct cmd_list_element *) xmalloc (sizeof (struct cmd_list_element));
+
+ delete_cmd (name, list);
+ c->next = *list;
+ c->name = savestring (name, strlen (name));
+ c->class = class;
+ c->function = fun;
+ c->doc = doc;
+ c->prefixlist = 0;
+ c->allow_unknown = 0;
+ c->abbrev_flag = 0;
+ c->aux = 0;
+ *list = c;
+ return c;
+}
+
+/* Same as above, except that the abbrev_flag is set. */
+
+struct cmd_list_element *
+add_abbrev_cmd (name, class, fun, doc, list)
+ char *name;
+ int class;
+ void (*fun) ();
+ char *doc;
+ struct cmd_list_element **list;
+{
+ register struct cmd_list_element *c
+ = (struct cmd_list_element *) xmalloc (sizeof (struct cmd_list_element));
+
+ delete_cmd (name, list);
+ c->next = *list;
+ c->name = savestring (name, strlen (name));
+ c->class = class;
+ c->function = fun;
+ c->doc = doc;
+ c->prefixlist = 0;
+ c->allow_unknown = 0;
+ c->abbrev_flag = 1;
+ c->aux = 0;
+ *list = c;
+ return c;
+}
+
+struct cmd_list_element *
+add_alias_cmd (name, oldname, class, abbrev_flag, list)
+ char *name;
+ char *oldname;
+ int 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, 0, 1, 1);
+
+ if (old == 0)
+ {
+ delete_cmd (name, list);
+ return 0;
+ }
+
+ c = add_cmd (name, class, old->function, old->doc, list);
+ c->prefixlist = old->prefixlist;
+ c->prefixname = old->prefixname;
+ c->allow_unknown = old->allow_unknown;
+ c->abbrev_flag = abbrev_flag;
+ c->aux = old->aux;
+ 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;
+ int class;
+ void (*fun) ();
+ 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 butsets 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;
+ int class;
+ void (*fun) ();
+ 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;
+}
+
+/* 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;
+
+ while (*list && !strcmp ((*list)->name, name))
+ {
+ *list = (*list)->next;
+ }
+
+ if (*list)
+ for (c = *list; c->next;)
+ {
+ if (!strcmp (c->next->name, name))
+ c->next = c->next->next;
+ else
+ c = c->next;
+ }
+}
+
+void help_cmd (), help_list (), help_cmd_list ();
+
+/* 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;
+ FILE *stream;
+{
+ struct cmd_list_element *c;
+ extern struct cmd_list_element *cmdlist;
+
+ if (!command)
+ {
+ help_list (cmdlist, "", -2, stream);
+ return;
+ }
+
+ c = lookup_cmd (&command, cmdlist, "", 0, 0);
+
+ if (c == 0)
+ return;
+
+ /* There are three cases here.
+ If c->prefixlist is nonzer, 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 he 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 != 0)
+ return;
+ fprintf_filtered (stream, "\n");
+
+ /* If this is a prefix command, print it's subcommands */
+ if (c->prefixlist)
+ help_list (*c->prefixlist, c->prefixname, -1, stream);
+
+ /* If this is a class name, print all of the commands in the class */
+ if (c->function == 0)
+ help_list (cmdlist, "", c->class, stream);
+}
+
+/*
+ * 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, -1 for
+ * everything, -2 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;
+ int class;
+ 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 == -2)
+ 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, (class >= 0), stream);
+
+ if (class == -2)
+ 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);
+}
+
+
+/*
+ * 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.
+ * -1 to list all commands in list.
+ * -2 to list all classes in list.
+ *
+ * Note that RECURSE will be active on *all* sublists, not just the
+ * ones seclected 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;
+ int class;
+ char *prefix;
+ int recurse;
+ FILE *stream;
+{
+ register struct cmd_list_element *c;
+ register char *p;
+ static char *line_buffer = 0;
+ static int line_size;
+
+ if (!line_buffer)
+ {
+ line_size = 80;
+ line_buffer = (char *) xmalloc (line_size);
+ }
+
+ for (c = list; c; c = c->next)
+ {
+ if (c->abbrev_flag == 0 &&
+ (class == -1
+ || (class == -2 && c->function == 0)
+ || (class == c->class && c->function != 0)))
+ {
+ fprintf_filtered (stream, "%s%s -- ", prefix, c->name);
+ /* Print just the first line */
+ p = c->doc;
+ while (*p && *p != '\n') p++;
+ if (p - c->doc > line_size - 1)
+ {
+ line_size = p - c->doc + 1;
+ free (line_buffer);
+ line_buffer = (char *) xmalloc (line_size);
+ }
+ strncpy (line_buffer, c->doc, p - c->doc);
+ line_buffer[p - c->doc] = '\0';
+ fputs_filtered (line_buffer, stream);
+ fputs_filtered ("\n", stream);
+ }
+ if (recurse
+ && c->prefixlist != 0
+ && c->abbrev_flag == 0)
+ help_cmd_list (*c->prefixlist, class, c->prefixname, 1, stream);
+ }
+}
+\f
+/* 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
+ the list in which the last word was matched, and will return the
+ cmd list element which the text matches. It will return 0 if no
+ match at all was possible. It will return -1 if ambigous matches are
+ possible; in this case *RESULT_LIST will be set to the list in which
+ there are ambiguous choices (and text will be set to the ambiguous
+ text string).
+
+ 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 0 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.
+
+ This routine does *not* modify the text pointed to by TEXT.
+
+ 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_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 == '_');
+ 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,
+ converting to lower case as we go. */
+
+ command = (char *) alloca (len + 1);
+ for (tmp = 0; tmp < len; tmp++)
+ {
+ char x = (*text)[tmp];
+ command[tmp] = (x >= 'A' && x <= 'Z') ? x - 'A' + 'a' : x;
+ }
+ command[len] = '\0';
+
+ /* Look it up. */
+ found = 0;
+ nfound = 0;
+ for (c = clist; c; c = c->next)
+ if (!strncmp (command, c->name, len)
+ && (!ignore_help_classes || c->function))
+ {
+ found = c;
+ nfound++;
+ if (c->name[len] == '\0')
+ {
+ nfound = 1;
+ break;
+ }
+ }
+
+ /* If nothing matches, we have a simple failure. */
+ if (nfound == 0)
+ return 0;
+
+ if (nfound > 1)
+ {
+ *result_list = 0; /* Will be modified in calling routine
+ if we know what the prefix command is.
+ */
+ return (struct cmd_list_element *) -1; /* Ambiguous. */
+ }
+
+ /* We've matched something on this list. Move text pointer forward. */
+
+ *text = p;
+ 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. */
+ *result_list = clist;
+ return found;
+ }
+ else if (c == (struct cmd_list_element *) -1)
+ {
+ /* We've gotten this far properley, 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)
+ /* 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
+ {
+ *result_list = clist;
+ return found;
+ }
+}
+
+/* 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);
+ char *ptr = (*line) + strlen (*line) - 1;
+
+ /* Clear off trailing whitespace. */
+ while (ptr >= *line && (*ptr == ' ' || *ptr == '\t'))
+ ptr--;
+ *(ptr + 1) = '\0';
+
+ 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';
+
+ error ("Undefined %scommand: \"%s\".", 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 < sizeof ambbuf)
+ {
+ if (strlen (ambbuf))
+ strcat (ambbuf, ", ");
+ strcat (ambbuf, c->name);
+ }
+ else
+ {
+ strcat (ambbuf, "..");
+ break;
+ }
+ }
+ error ("Ambiguous %scommand \"%s\": %s.", local_cmdtype,
+ *line, ambbuf);
+ }
+ }
+ 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)
+ error ("Undefined %scommand: \"%s\".", c->prefixname, *line);
+
+ /* Seems to be what he wants. Return it. */
+ return c;
+ }
+}
+
+#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 == '-'
+ || (*p >= 'a' && *p <= 'z')
+ || (*p >= 'A' && *p <= 'Z')
+ || (*p >= '0' && *p <= '9'))
+ 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 (x >= 'A' && x <= 'Z')
+ processed_cmd[cmd_len] = x - 'A' + 'a';
+ 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. */
+
+char **
+complete_on_cmdlist (list, text)
+ struct cmd_list_element *list;
+ char *text;
+{
+ 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
+ || ptr->prefixlist))
+ {
+ if (matches == sizeof_matchlist)
+ {
+ sizeof_matchlist *= 2;
+ matchlist = (char **) xrealloc (matchlist,
+ (sizeof_matchlist
+ * sizeof (char *)));
+ }
+
+ matchlist[matches] = (char *)
+ xmalloc (strlen (ptr->name) + 1);
+ strcpy (matchlist[matches++], ptr->name);
+ }
+
+ if (matches == 0)
+ {
+ free (matchlist);
+ matchlist = 0;
+ }
+ else
+ {
+ matchlist = (char **) xrealloc (matchlist, ((matches + 1)
+ * sizeof (char *)));
+ matchlist[matches] = (char *) 0;
+ }
+
+ return matchlist;
+}
+
+static void
+shell_escape (arg, from_tty)
+ char *arg;
+ int from_tty;
+{
+ int rc, status, pid;
+ char *p, *user_shell;
+ extern char *rindex ();
+
+ if ((user_shell = (char *) getenv ("SHELL")) == NULL)
+ user_shell = "/bin/sh";
+
+ /* Get the name of the shell for arg0 */
+ if ((p = rindex (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 (stderr, "Exec of shell failed\n");
+ exit (0);
+ }
+
+ if (pid != -1)
+ while ((rc = wait (&status)) != pid && rc != -1)
+ ;
+ else
+ error ("Fork failed");
+}
+
+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.");
+}
projects / unix-history / commitdiff