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Diffstat (limited to 'gdb/main.c')
| -rw-r--r-- | gdb/main.c | 1072 |
1 files changed, 1072 insertions, 0 deletions
diff --git a/gdb/main.c b/gdb/main.c new file mode 100644 index 0000000..d6e993e --- /dev/null +++ b/gdb/main.c @@ -0,0 +1,1072 @@ +/* Top level for GDB, the GNU debugger. + Copyright (C) 1986, 1987 Free Software Foundation, Inc. + +GDB is distributed in the hope that it will be useful, but WITHOUT ANY +WARRANTY. No author or distributor accepts responsibility to anyone +for the consequences of using it or for whether it serves any +particular purpose or works at all, unless he says so in writing. +Refer to the GDB General Public License for full details. + +Everyone is granted permission to copy, modify and redistribute GDB, +but only under the conditions described in the GDB General Public +License. A copy of this license is supposed to have been given to you +along with GDB so you can know your rights and responsibilities. It +should be in a file named COPYING. Among other things, the copyright +notice and this notice must be preserved on all copies. + +In other words, go ahead and share GDB, but don't try to stop +anyone else from sharing it farther. Help stamp out software hoarding! +*/ + +#include <sys/types.h> +#include <sys/file.h> +#include <stdio.h> +#include <setjmp.h> +#include <signal.h> +#include <sys/param.h> +#include "defs.h" +#include "command.h" +#include "param.h" + +#ifdef SET_STACK_LIMIT_HUGE +#include <sys/time.h> +#include <sys/resource.h> +#endif + +/* Version number of GDB, as a string. */ + +extern char *version; + +/* Chain containing all defined commands. */ + +struct cmd_list_element *cmdlist; + +/* Chain containing all defined info subcommands. */ + +struct cmd_list_element *infolist; + +/* stdio stream that command input is being read from. */ + +FILE *instream; + +/* Nonzero if we should refrain from using an X window. */ + +int inhibit_windows = 0; + +/* Function to call before reading a command, if nonzero. + The function receives two args: an input stream, + and a prompt string. */ + +void (*window_hook) (); + +void free_command_lines (); +char *read_line (); +static void initialize_main (); +void command_loop (); +static void source_command (); +void print_gdb_version (); + +/* gdb prints this when reading a command interactively */ +static char *prompt; + +/* Buffer used for reading command lines, and the size + allocated for it so far. */ + +char *line; +int linesize; + +/* This is how `error' returns to command level. */ + +jmp_buf to_top_level; + +return_to_top_level () +{ + quit_flag = 0; + immediate_quit = 0; + clear_breakpoint_commands (); + clear_momentary_breakpoints (); + do_cleanups (0); + longjmp (to_top_level, 1); +} + +main (argc, argv, envp) + int argc; + char **argv; + char **envp; +{ + extern void request_quit (); + int count; + int inhibit_gdbinit = 0; + int quiet = 0; + int batch = 0; + register int i; + + quit_flag = 0; + linesize = 100; + line = (char *) xmalloc (linesize); + instream = stdin; + +#ifdef SET_STACK_LIMIT_HUGE + { + struct rlimit rlim; + + /* Set the stack limit huge so that alloca (particularly stringtab + * in dbxread.c) does not fail. */ + getrlimit (RLIMIT_STACK, &rlim); + rlim.rlim_cur = rlim.rlim_max; + setrlimit (RLIMIT_STACK, &rlim); + } +#endif /* SET_STACK_LIMIT_HUGE */ + + /* Look for flag arguments. */ + + for (i = 1; i < argc; i++) + { + if (!strcmp (argv[i], "-q") || !strcmp (argv[i], "-quiet")) + quiet = 1; + else if (!strcmp (argv[i], "-nx")) + inhibit_gdbinit = 1; + else if (!strcmp (argv[i], "-nw")) + inhibit_windows = 1; + else if (!strcmp (argv[i], "-batch")) + batch = 1, quiet = 1; + else if (argv[i][0] == '-') + i++; + } + + /* Run the init function of each source file */ + + initialize_all_files (); + initialize_main (); /* But that omits this file! Do it now */ + + signal (SIGINT, request_quit); + signal (SIGQUIT, SIG_IGN); + + if (!quiet) + print_gdb_version (); + + /* Process the command line arguments. */ + + count = 0; + for (i = 1; i < argc; i++) + { + register char *arg = argv[i]; + /* Args starting with - say what to do with the following arg + as a filename. */ + if (arg[0] == '-') + { + extern void exec_file_command (), symbol_file_command (); + extern void core_file_command (), directory_command (); + extern void tty_command (); + + if (!strcmp (arg, "-q") || !strcmp (arg, "-nx") + || !strcmp (arg, "quiet") || !strcmp (arg, "-batch")) + /* Already processed above */ + continue; + + if (++i == argc) + fprintf (stderr, "No argument follows \"%s\".\n", arg); + if (!setjmp (to_top_level)) + { + /* -s foo: get syms from foo. -e foo: execute foo. + -se foo: do both with foo. -c foo: use foo as core dump. */ + if (!strcmp (arg, "-se")) + { + exec_file_command (argv[i], !batch); + symbol_file_command (argv[i], !batch); + } + else if (!strcmp (arg, "-s") || !strcmp (arg, "-symbols")) + symbol_file_command (argv[i], !batch); + else if (!strcmp (arg, "-e") || !strcmp (arg, "-exec")) + exec_file_command (argv[i], !batch); + else if (!strcmp (arg, "-c") || !strcmp (arg, "-core")) + core_file_command (argv[i], !batch); + /* -x foo: execute commands from foo. */ + else if (!strcmp (arg, "-x") || !strcmp (arg, "-command") + || !strcmp (arg, "-commands")) + source_command (argv[i]); + /* -d foo: add directory `foo' to source-file directory + search-list */ + else if (!strcmp (arg, "-d") || !strcmp (arg, "-dir") + || !strcmp (arg, "-directory")) + directory_command (argv[i], 0); + /* -t /def/ttyp1: use /dev/ttyp1 for inferior I/O. */ + else if (!strcmp (arg, "-t") || !strcmp (arg, "-tty")) + tty_command (argv[i], 0); + else + error ("Unknown command-line switch: \"%s\"\n", arg); + } + } + else + { + /* Args not thus accounted for + are treated as, first, the symbol/executable file + and, second, the core dump file. */ + count++; + if (!setjmp (to_top_level)) + switch (count) + { + case 1: + exec_file_command (arg, !batch); + symbol_file_command (arg, !batch); + break; + + case 2: + core_file_command (arg, !batch); + break; + + case 3: + fprintf (stderr, "Excess command line args ignored. (%s%s)\n", + arg, (i == argc - 1) ? "" : " ..."); + } + } + } + + /* Read init file, if it exists in home directory */ + if (getenv ("HOME")) + { + char *s; + s = (char *) xmalloc (strlen (getenv ("HOME")) + 10); + strcpy (s, getenv ("HOME")); + strcat (s, "/.gdbinit"); + if (!inhibit_gdbinit && access (s, R_OK) == 0) + if (!setjmp (to_top_level)) + source_command (s); + } + + /* Read init file, if it exists in current directory. */ + if (!inhibit_gdbinit && access (".gdbinit", R_OK) == 0) + if (!setjmp (to_top_level)) + source_command (".gdbinit"); + + if (batch) + fatal ("Attempt to read commands from stdin in batch mode."); + + if (!quiet) + printf ("Type \"help\" for a list of commands.\n"); + + /* The command loop. */ + + while (1) + { + if (!setjmp (to_top_level)) + command_loop (); + clearerr (stdin); /* Don't get hung if C-d is typed. */ + } +} + +/* Execute the line P as a command. + Pass FROM_TTY as second argument to the defining function. */ + +void +execute_command (p, from_tty) + char *p; + int from_tty; +{ + register struct cmd_list_element *c; + register struct command_line *cmdlines; + + free_all_values (); + while (*p == ' ' || *p == '\t') p++; + if (*p) + { + c = lookup_cmd (&p, cmdlist, "", 0); + if (c->function == 0) + error ("That is not a command, just a help topic."); + else if (c->class == (int) class_user) + { + if (*p) + error ("User-defined commands cannot take command-line arguments: \"%s\"", + p); + cmdlines = (struct command_line *) c->function; + if (cmdlines == (struct command_line *) 0) + /* Null command */ + return; + while (cmdlines) + { + execute_command (cmdlines->line, 0); + cmdlines = cmdlines->next; + } + } + else + /* Pass null arg rather than an empty one. */ + (*c->function) (*p ? p : 0, from_tty); + } +} + +static void +do_nothing () +{ +} + +/* Read commands from `instream' and execute them + until end of file. */ +void +command_loop () +{ + struct cleanup *old_chain; + while (!feof (instream)) + { + if (instream == stdin) + printf ("%s", prompt); + fflush (stdout); + + if (window_hook && instream == stdin) + (*window_hook) (instream, prompt); + + quit_flag = 0; + old_chain = make_cleanup (do_nothing, 0); + execute_command (read_line (instream == stdin), instream == stdin); + /* Do any commands attached to breakpoint we stopped at. */ + do_breakpoint_commands (); + do_cleanups (old_chain); + } +} + +static void +stop_sig () +{ + signal (SIGTSTP, SIG_DFL); + sigsetmask (0); + kill (getpid (), SIGTSTP); + signal (SIGTSTP, stop_sig); + printf ("%s", prompt); + fflush (stdout); + + /* Forget about any previous command -- null line now will do nothing. */ + *line = 0; +} + +/* Commands call this if they do not want to be repeated by null lines. */ + +void +dont_repeat () +{ + *line = 0; +} + +/* Read one line from the command input stream `instream' + into the buffer `line' (whose current length is `linesize'). + The buffer is made bigger as necessary. + Returns the address of the start of the line. */ + +char * +read_line (repeat) + int repeat; +{ + register char *p = line; + register char *p1; + register int c; + char *nline; + + /* Control-C quits instantly if typed while in this loop + since it should not wait until the user types a newline. */ + immediate_quit++; + signal (SIGTSTP, stop_sig); + + while (1) + { + c = fgetc (instream); + if (c == -1 || c == '\n') + break; + if (p - line == linesize - 1) + { + linesize *= 2; + nline = (char *) xrealloc (line, linesize); + p += nline - line; + line = nline; + } + *p++ = c; + } + + signal (SIGTSTP, SIG_DFL); + immediate_quit--; + + /* If we just got an empty line, and that is supposed + to repeat the previous command, leave the last input unchanged. */ + if (p == line && repeat) + return line; + + /* If line is a comment, clear it out. */ + p1 = line; + while ((c = *p1) == ' ' || c == '\t') p1++; + if (c == '#') + p = line; + + *p = 0; + + return line; +} + +/* Read lines from the input stream + and accumulate them in a chain of struct command_line's + which is then returned. */ + +struct command_line * +read_command_lines () +{ + struct command_line *first = 0; + register struct command_line *next, *tail = 0; + register char *p, *p1; + struct cleanup *old_chain = 0; + + while (1) + { + dont_repeat (); + p = read_line (1); + /* Remove leading and trailing blanks. */ + while (*p == ' ' || *p == '\t') p++; + p1 = p + strlen (p); + while (p1 != p && (p1[-1] == ' ' || p1[-1] == '\t')) p1--; + + /* Is this "end"? */ + if (p1 - p == 3 && !strncmp (p, "end", 3)) + break; + + /* No => add this line to the chain of command lines. */ + next = (struct command_line *) xmalloc (sizeof (struct command_line)); + next->line = savestring (p, p1 - p); + next->next = 0; + if (tail) + { + tail->next = next; + } + else + { + /* We just read the first line. + From now on, arrange to throw away the lines we have + if we quit or get an error while inside this function. */ + first = next; + old_chain = make_cleanup (free_command_lines, &first); + } + tail = next; + } + + dont_repeat (); + + /* Now we are about to return the chain to our caller, + so freeing it becomes his responsibility. */ + if (first) + discard_cleanups (old_chain); + return first; +} + +/* Free a chain of struct command_line's. */ + +void +free_command_lines (lptr) + struct command_line **lptr; +{ + register struct command_line *l = *lptr; + register struct command_line *next; + + while (l) + { + next = l->next; + free (l->line); + free (l); + l = next; + } +} + +/* Add an element to the list of info subcommands. */ + +void +add_info (name, fun, doc) + char *name; + void (*fun) (); + char *doc; +{ + add_cmd (name, 0, fun, doc, &infolist); +} + +/* Add an alias to the list of info subcommands. */ + +void +add_info_alias (name, oldname, abbrev_flag) + char *name; + char *oldname; + int abbrev_flag; +{ + add_alias_cmd (name, oldname, 0, abbrev_flag, &infolist); +} + +/* The "info" command is defined as a prefix, with allow_unknown = 0. + Therefore, its own definition is called only for "info" with no args. */ + +static void +info_command () +{ + printf ("\"info\" must be followed by the name of an info command.\n"); + help_cmd (0, infolist, "info ", -1, stdout); +} + +/* Add an element to the list of commands. */ + +void +add_com (name, class, fun, doc) + char *name; + int class; + void (*fun) (); + char *doc; +{ + add_cmd (name, class, fun, doc, &cmdlist); +} + +/* Add an alias or abbreviation command to the list of commands. */ + +void +add_com_alias (name, oldname, class, abbrev_flag) + char *name; + char *oldname; + int class; + int abbrev_flag; +{ + add_alias_cmd (name, oldname, class, abbrev_flag, &cmdlist); +} + +void +error_no_arg (why) + char *why; +{ + error ("Argument required (%s).", why); +} + +static void +help_command (command, from_tty) + char *command; + int from_tty; /* Ignored */ +{ + help_cmd (command, cmdlist, "", -2, stdout); +} + +static void +validate_comname (comname) + char *comname; +{ + register char *p; + + if (comname == 0) + error_no_arg ("name of command to define"); + + p = comname; + while (*p) + { + if (!(*p >= 'A' && *p <= 'Z') + && !(*p >= 'a' && *p <= 'z') + && !(*p >= '1' && *p <= '9') + && *p != '-') + error ("Junk in argument list: \"%s\"", p); + p++; + } +} + +static void +define_command (comname, from_tty) + char *comname; + int from_tty; +{ + register struct command_line *cmds; + register struct cmd_list_element *c; + char *tem = comname; + + validate_comname (comname); + + c = lookup_cmd (&tem, cmdlist, "", -1); + if (c) + { + if (c->class == (int) class_user || c->class == (int) class_alias) + tem = "Redefine command \"%s\"? "; + else + tem = "Really redefine built-in command \"%s\"? "; + if (!query (tem, comname)) + error ("Command \"%s\" not redefined.", comname); + } + + if (from_tty) + printf ("Type commands for definition of \"%s\".\n\ +End with a line saying just \"end\".\n", comname); + + comname = savestring (comname, strlen (comname)); + + cmds = read_command_lines (); + + if (c && c->class == (int) class_user) + free_command_lines (&c->function); + + add_com (comname, class_user, cmds, + (c && c->class == (int) class_user) + ? c->doc : savestring ("User-defined.", 13)); +} + +static void +document_command (comname, from_tty) + char *comname; + int from_tty; +{ + struct command_line *doclines; + register struct cmd_list_element *c; + char *tem = comname; + + validate_comname (comname); + + c = lookup_cmd (&tem, cmdlist, "", 0); + + if (c->class != (int) class_user) + error ("Command \"%s\" is built-in.", comname); + + if (from_tty) + printf ("Type documentation for \"%s\".\n\ +End with a line saying just \"end\".\n", comname); + + doclines = read_command_lines (); + + if (c->doc) free (c->doc); + + { + register struct command_line *cl1; + register int len = 0; + + for (cl1 = doclines; cl1; cl1 = cl1->next) + len += strlen (cl1->line) + 1; + + c->doc = (char *) xmalloc (len + 1); + *c->doc = 0; + + for (cl1 = doclines; cl1; cl1 = cl1->next) + { + strcat (c->doc, cl1->line); + if (cl1->next) + strcat (c->doc, "\n"); + } + } + + free_command_lines (&doclines); +} + +static void +copying_info () +{ + immediate_quit++; + printf (" GDB GENERAL PUBLIC LICENSE\n\ +\n\ + Copyright (C) 1986 Richard M. Stallman\n\ + Everyone is permitted to copy and distribute verbatim copies\n\ + of this license, but changing it is not allowed.\n\ +\n\ + The license agreements of most software companies keep you at the\n\ +mercy of those companies. By contrast, our general public license is\n\ +intended to give everyone the right to share GDB. To make sure that\n\ +you get the rights we want you to have, we need to make restrictions\n\ +that forbid anyone to deny you these rights or to ask you to surrender\n\ +the rights. Hence this license agreement.\n\ +\n\ + Specifically, we want to make sure that you have the right to give\n\ +away copies of GDB, that you receive source code or else can get it\n\ +if you want it, that you can change GDB or use pieces of it in new\n\ +free programs, and that you know you can do these things.\n\ +--Type Return to print more--"); + fflush (stdout); + read_line (); + + printf ("\ + To make sure that everyone has such rights, we have to forbid you to\n\ +deprive anyone else of these rights. For example, if you distribute\n\ +copies of GDB, you must give the recipients all the rights that you\n\ +have. You must make sure that they, too, receive or can get the\n\ +source code. And you must tell them their rights.\n\ +\n\ + Also, for our own protection, we must make certain that everyone\n\ +finds out that there is no warranty for GDB. If GDB is modified by\n\ +someone else and passed on, we want its recipients to know that what\n\ +they have is not what we distributed, so that any problems introduced\n\ +by others will not reflect on our reputation.\n\ +\n\ + Therefore we (Richard Stallman and the Free Software Foundation,\n\ +Inc.) make the following terms which say what you must do to be\n\ +allowed to distribute or change GDB.\n\ +--Type Return to print more--"); + fflush (stdout); + read_line (); + + printf ("\ + COPYING POLICIES\n\ +\n\ + 1. You may copy and distribute verbatim copies of GDB source code as\n\ +you receive it, in any medium, provided that you conspicuously and\n\ +appropriately publish on each copy a valid copyright notice \"Copyright\n\ +\(C) 1987 Free Software Foundation, Inc.\" (or with the year updated if\n\ +that is appropriate); keep intact the notices on all files that refer\n\ +to this License Agreement and to the absence of any warranty; and give\n\ +any other recipients of the GDB program a copy of this License\n\ +Agreement along with the program. You may charge a distribution fee\n\ +for the physical act of transferring a copy.\n\ +\n\ + 2. You may modify your copy or copies of GDB or any portion of it,\n\ +and copy and distribute such modifications under the terms of\n\ +Paragraph 1 above, provided that you also do the following:\n\ +\n\ + a) cause the modified files to carry prominent notices stating\n\ + that you changed the files and the date of any change; and\n\ +--Type Return to print more--"); + fflush (stdout); + read_line (); + + printf ("\ + b) cause the whole of any work that you distribute or publish,\n\ + that in whole or in part contains or is a derivative of GDB\n\ + or any part thereof, to be licensed to all third parties on terms\n\ + identical to those contained in this License Agreement (except that\n\ + you may choose to grant more extensive warranty protection to third\n\ + parties, at your option).\n\ +\n"); + printf ("\ + c) if the modified program serves as a debugger, cause it\n\ + when started running in the simplest and usual way, to print\n\ + an announcement including a valid copyright notice\n\ + \"Copyright (C) 1987 Free Software Foundation, Inc.\" (or with\n\ + the year updated if appropriate), saying that there\n\ + is no warranty (or else, saying that you provide\n\ + a warranty) and that users may redistribute the program under\n\ + these conditions, and telling the user how to view a copy of\n\ + this License Agreement.\n\ +\n\ + d) You may charge a distribution fee for the physical act of\n\ + transferring a copy, and you may at your option offer warranty\n\ + protection in exchange for a fee.\n\ +--Type Return to print more--"); + fflush (stdout); + read_line (); + + printf ("\ + 3. You may copy and distribute GDB or any portion of it in\n\ +compiled, executable or object code form under the terms of Paragraphs\n\ +1 and 2 above provided that you do the following:\n\ +\n\ + a) cause each such copy to be accompanied by the\n\ + corresponding machine-readable source code, which must\n\ + be distributed under the terms of Paragraphs 1 and 2 above; or,\n\ +\n\ + b) cause each such copy to be accompanied by a\n\ + written offer, with no time limit, to give any third party\n\ + free (except for a nominal shipping charge) a machine readable\n\ + copy of the corresponding source code, to be distributed\n\ + under the terms of Paragraphs 1 and 2 above; or,\n\n"); + + printf ("\ + c) in the case of a recipient of GDB in compiled, executable\n\ + or object code form (without the corresponding source code) you\n\ + shall cause copies you distribute to be accompanied by a copy\n\ + of the written offer of source code which you received along\n\ + with the copy you received.\n\ +--Type Return to print more--"); + fflush (stdout); + read_line (); + + printf ("\ + 4. You may not copy, sublicense, distribute or transfer GDB\n\ +except as expressly provided under this License Agreement. Any attempt\n\ +otherwise to copy, sublicense, distribute or transfer GDB is void and\n\ +your rights to use the program under this License agreement shall be\n\ +automatically terminated. However, parties who have received computer\n\ +software programs from you with this License Agreement will not have\n\ +their licenses terminated so long as such parties remain in full compliance.\n\ +\n\ + 5. If you wish to incorporate parts of GDB into other free\n\ +programs whose distribution conditions are different, write to the Free\n\ +Software Foundation at 675 Mass Ave, Cambridge, MA 02139. We have not yet\n\ +worked out a simple rule that can be stated here, but we will often permit\n\ +this. We will be guided by the two goals of preserving the free status of\n\ +all derivatives of our free software and of promoting the sharing and reuse\n\ +of software.\n\ +\n\ +In other words, go ahead and share GDB, but don't try to stop\n\ +anyone else from sharing it farther. Help stamp out software hoarding!\n\ +"); + immediate_quit--; +} + +static void +warranty_info () +{ + immediate_quit++; + printf (" NO WARRANTY\n\ +\n\ + BECAUSE GDB IS LICENSED FREE OF CHARGE, WE PROVIDE ABSOLUTELY NO\n\ +WARRANTY, TO THE EXTENT PERMITTED BY APPLICABLE STATE LAW. EXCEPT\n\ +WHEN OTHERWISE STATED IN WRITING, FREE SOFTWARE FOUNDATION, INC,\n\ +RICHARD M. STALLMAN AND/OR OTHER PARTIES PROVIDE GDB \"AS IS\" WITHOUT\n\ +WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT\n\ +LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR\n\ +A PARTICULAR PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND\n\ +PERFORMANCE OF GDB IS WITH YOU. SHOULD GDB PROVE DEFECTIVE, YOU\n\ +ASSUME THE COST OF ALL NECESSARY SERVICING, REPAIR OR CORRECTION.\n\n"); + + printf ("\ + IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW WILL RICHARD M.\n\ +STALLMAN, THE FREE SOFTWARE FOUNDATION, INC., AND/OR ANY OTHER PARTY\n\ +WHO MAY MODIFY AND REDISTRIBUTE GDB, BE LIABLE TO\n\ +YOU FOR DAMAGES, INCLUDING ANY LOST PROFITS, LOST MONIES, OR OTHER\n\ +SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR\n\ +INABILITY TO USE (INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR DATA\n\ +BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY THIRD PARTIES OR A\n\ +FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS) GDB, EVEN\n\ +IF YOU HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES, OR FOR\n\ +ANY CLAIM BY ANY OTHER PARTY.\n"); + immediate_quit--; +} + +static void +print_gdb_version () +{ + printf ("GDB %s, Copyright (C) 1987 Free Software Foundation, Inc.\n\ +There is ABSOLUTELY NO WARRANTY for GDB; type \"info warranty\" for details.\n\ +GDB is free software and you are welcome to distribute copies of it\n\ + under certain conditions; type \"info copying\" to see the conditions.\n", + version); +} + +static void +version_info () +{ + immediate_quit++; + print_gdb_version (); + immediate_quit--; +} + +static void +set_prompt_command (text) + char *text; +{ + char *p, *q; + register int c; + char *new; + + if (text == 0) + error_no_arg ("string to which to set prompt"); + + new = (char *) xmalloc (strlen (text) + 2); + p = text; q = new; + while (c = *p++) + { + if (c == '\\') + { + /* \ at end of argument is used after spaces + so they won't be lost. */ + if (*p == 0) + break; + c = parse_escape (&p); + if (c == 0) + break; /* C loses */ + else if (c > 0) + *q++ = c; + } + else + *q++ = c; + } + if (*(p - 1) != '\\') + *q++ = ' '; + *q++ = '\0'; + new = (char *) xrealloc (new, q - new); + free (prompt); + prompt = new; +} + +static void +quit_command () +{ + if (have_inferior_p ()) + { + if (query ("The program is running. Quit anyway? ")) + { + /* Prevent any warning message from reopen_exec_file, in case + we have a core file that's inconsistent with the exec file. */ + exec_file_command (0, 0); + kill_inferior (); + } + else + error ("Not confirmed."); + } + exit (0); +} + +int +input_from_terminal_p () +{ + return instream == stdin; +} + +static void +pwd_command (arg, from_tty) + char *arg; + int from_tty; +{ + char buf[MAXPATHLEN]; + if (arg) error ("The \"pwd\" command does not take an argument: %s", arg); + printf ("Working directory %s.\n", getwd (buf)); +} + +static void +cd_command (dir, from_tty) + char *dir; + int from_tty; +{ + if (dir == 0) + error_no_arg ("new working directory"); + + if (chdir (dir) < 0) + perror_with_name (dir); + if (from_tty) + pwd_command ((char *) 0, 1); +} + + +/* Clean up on error during a "source" command. + Close the file opened by the command + and restore the previous input stream. */ + +static void +source_cleanup (stream) + FILE *stream; +{ + fclose (instream); + instream = stream; +} + +static void +source_command (file) + char *file; +{ + FILE *stream; + struct cleanup *cleanups; + + if (file == 0) + error_no_arg ("file to read commands from"); + + stream = fopen (file, "r"); + if (stream == 0) + perror_with_name (file); + + cleanups = make_cleanup (source_cleanup, instream); + + instream = stream; + + command_loop (); + + do_cleanups (cleanups); +} + +static void +echo_command (text) + char *text; +{ + char *p = text; + register int c; + + if (text) + while (c = *p++) + { + if (c == '\\') + { + /* \ at end of argument is used after spaces + so they won't be lost. */ + if (*p == 0) + return; + + c = parse_escape (&p); + if (c >= 0) + fputc (c, stdout); + } + else + fputc (c, stdout); + } +} + +static void +dump_me_command () +{ + if (query ("Should GDB dump core? ")) + { + signal (SIGQUIT, SIG_DFL); + kill (getpid (), SIGQUIT); + } +} + + +static void +initialize_main () +{ + prompt = savestring ("(gdb) ", 6); + + /* Define the classes of commands. + They will appear in the help list in the reverse of this order. */ + + add_cmd ("obscure", class_obscure, 0, "Obscure features.", &cmdlist); + add_cmd ("alias", class_alias, 0, "Aliases of other commands.", &cmdlist); + add_cmd ("user", class_user, 0, "User-defined commands.\n\ +The commands in this class are those defined by the user.\n\ +Use the \"define\" command to define a command.", &cmdlist); + add_cmd ("support", class_support, 0, "Support facilities.", &cmdlist); + add_cmd ("status", class_info, 0, "Status inquiries.", &cmdlist); + add_cmd ("files", class_files, 0, "Specifying and examining files.", &cmdlist); + add_cmd ("breakpoints", class_breakpoint, 0, "Making program stop at certain points.", &cmdlist); + add_cmd ("data", class_vars, 0, "Examining data.", &cmdlist); + add_cmd ("stack", class_stack, 0, "Examining the stack.\n\ +The stack is made up of stack frames. Gdb assigns numbers to stack frames\n\ +counting from zero for the innermost (currently executing) frame.\n\n\ +At any time gdb identifies one frame as the \"selected\" frame.\n\ +Variable lookups are done with respect to the selected frame.\n\ +When the program being debugged stops, gdb selects the innermost frame.\n\ +The commands below can be used to select other frames by number or address.", + &cmdlist); + add_cmd ("running", class_run, 0, "Running the program.", &cmdlist); + + add_com ("pwd", class_files, pwd_command, + "Print working directory. This is used for your program as well."); + add_com ("cd", class_files, cd_command, + "Set working directory to DIR for debugger and program being debugged.\n\ +The change does not take effect for the program being debugged\n\ +until the next time it is started."); + + add_com ("set-prompt", class_support, set_prompt_command, + "Change gdb's prompt from the default of \"(gdb)\""); + add_com ("echo", class_support, echo_command, + "Print a constant string. Give string as argument.\n\ +C escape sequences may be used in the argument.\n\ +No newline is added at the end of the argument;\n\ +use \"\\n\" if you want a newline to be printed.\n\ +Since leading and trailing whitespace are ignored in command arguments,\n\ +if you want to print some you must use \"\\\" before leading whitespace\n\ +to be printed or after trailing whitespace."); + add_com ("document", class_support, document_command, + "Document a user-defined command.\n\ +Give command name as argument. Give documentation on following lines.\n\ +End with a line of just \"end\"."); + add_com ("define", class_support, define_command, + "Define a new command name. Command name is argument.\n\ +Definition appears on following lines, one command per line.\n\ +End with a line of just \"end\".\n\ +Use the \"document\" command to give documentation for the new command.\n\ +Commands defined in this way do not take arguments."); + + add_com ("source", class_support, source_command, + "Read commands from a file named FILE.\n\ +Note that the file \".gdbinit\" is read automatically in this way\n\ +when gdb is started."); + add_com ("quit", class_support, quit_command, "Exit gdb."); + add_com ("help", class_support, help_command, "Print list of commands."); + add_com_alias ("q", "quit", class_support, 1); + add_com_alias ("h", "help", class_support, 1); + + add_com ("dump-me", class_obscure, dump_me_command, + "Get fatal error; make debugger dump its core."); + + add_prefix_cmd ("info", class_info, info_command, + "Generic command for printing status.", + &infolist, "info ", 0, &cmdlist); + add_com_alias ("i", "info", class_info, 1); + + add_info ("copying", copying_info, "Conditions for redistributing copies of GDB."); + add_info ("warranty", warranty_info, "Various kinds of warranty you do not have."); + add_info ("version", version_info, "Report what version of GDB this is."); +} |