| 1 | /* GNU m4 -- A simple macro processor
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| 2 |
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| 3 | Copyright (C) 1989, 1990, 1991, 1992, 1993, 1994, 2000, 2004, 2006
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| 4 | Free Software Foundation, Inc.
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| 5 |
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| 6 | This program is free software; you can redistribute it and/or modify
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| 7 | it under the terms of the GNU General Public License as published by
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| 8 | the Free Software Foundation; either version 2 of the License, or
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| 9 | (at your option) any later version.
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| 10 |
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| 11 | This program is distributed in the hope that it will be useful,
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| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 14 | GNU General Public License for more details.
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| 15 |
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| 16 | You should have received a copy of the GNU General Public License
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| 17 | along with this program; if not, write to the Free Software
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| 18 | Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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| 19 | 02110-1301 USA
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| 20 | */
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| 21 |
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| 22 | /* Code for all builtin macros, initialization of symbol table, and
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| 23 | expansion of user defined macros. */
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| 24 |
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| 25 | #include "m4.h"
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| 26 |
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| 27 | extern FILE *popen ();
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| 28 |
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| 29 | #include "regex.h"
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| 30 | #include "strstr.h"
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| 31 |
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| 32 | #if HAVE_SYS_WAIT_H
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| 33 | # include <sys/wait.h>
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| 34 | #endif
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| 35 |
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| 36 | #define ARG(i) (argc > (i) ? TOKEN_DATA_TEXT (argv[i]) : "")
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| 37 |
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| 38 | /* Initialization of builtin and predefined macros. The table
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| 39 | "builtin_tab" is both used for initialization, and by the "builtin"
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| 40 | builtin. */
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| 41 |
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| 42 | #define DECLARE(name) \
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| 43 | static void name (struct obstack *, int, token_data **)
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| 44 |
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| 45 | DECLARE (m4___file__);
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| 46 | DECLARE (m4___line__);
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| 47 | DECLARE (m4___program__);
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| 48 | DECLARE (m4_builtin);
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| 49 | DECLARE (m4_changecom);
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| 50 | DECLARE (m4_changequote);
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| 51 | #ifdef ENABLE_CHANGEWORD
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| 52 | DECLARE (m4_changeword);
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| 53 | #endif
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| 54 | DECLARE (m4_debugmode);
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| 55 | DECLARE (m4_debugfile);
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| 56 | DECLARE (m4_decr);
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| 57 | DECLARE (m4_define);
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| 58 | DECLARE (m4_defn);
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| 59 | DECLARE (m4_divert);
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| 60 | DECLARE (m4_divnum);
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| 61 | DECLARE (m4_dnl);
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| 62 | DECLARE (m4_dumpdef);
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| 63 | DECLARE (m4_errprint);
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| 64 | DECLARE (m4_esyscmd);
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| 65 | DECLARE (m4_eval);
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| 66 | DECLARE (m4_format);
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| 67 | DECLARE (m4_ifdef);
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| 68 | DECLARE (m4_ifelse);
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| 69 | DECLARE (m4_include);
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| 70 | DECLARE (m4_incr);
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| 71 | DECLARE (m4_index);
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| 72 | DECLARE (m4_indir);
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| 73 | DECLARE (m4_len);
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| 74 | DECLARE (m4_m4exit);
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| 75 | DECLARE (m4_m4wrap);
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| 76 | DECLARE (m4_maketemp);
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| 77 | DECLARE (m4_mkstemp);
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| 78 | DECLARE (m4_patsubst);
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| 79 | DECLARE (m4_popdef);
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| 80 | DECLARE (m4_pushdef);
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| 81 | DECLARE (m4_regexp);
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| 82 | DECLARE (m4_shift);
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| 83 | DECLARE (m4_sinclude);
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| 84 | DECLARE (m4_substr);
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| 85 | DECLARE (m4_syscmd);
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| 86 | DECLARE (m4_sysval);
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| 87 | DECLARE (m4_traceoff);
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| 88 | DECLARE (m4_traceon);
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| 89 | DECLARE (m4_translit);
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| 90 | DECLARE (m4_undefine);
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| 91 | DECLARE (m4_undivert);
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| 92 |
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| 93 | #undef DECLARE
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| 94 |
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| 95 | static builtin
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| 96 | builtin_tab[] =
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| 97 | {
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| 98 |
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| 99 | /* name GNUext macros blind function */
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| 100 |
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| 101 | { "__file__", true, false, false, m4___file__ },
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| 102 | { "__line__", true, false, false, m4___line__ },
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| 103 | { "__program__", true, false, false, m4___program__ },
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| 104 | { "builtin", true, true, true, m4_builtin },
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| 105 | { "changecom", false, false, false, m4_changecom },
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| 106 | { "changequote", false, false, false, m4_changequote },
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| 107 | #ifdef ENABLE_CHANGEWORD
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| 108 | { "changeword", true, false, true, m4_changeword },
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| 109 | #endif
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| 110 | { "debugmode", true, false, false, m4_debugmode },
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| 111 | { "debugfile", true, false, false, m4_debugfile },
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| 112 | { "decr", false, false, true, m4_decr },
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| 113 | { "define", false, true, true, m4_define },
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| 114 | { "defn", false, false, true, m4_defn },
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| 115 | { "divert", false, false, false, m4_divert },
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| 116 | { "divnum", false, false, false, m4_divnum },
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| 117 | { "dnl", false, false, false, m4_dnl },
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| 118 | { "dumpdef", false, false, false, m4_dumpdef },
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| 119 | { "errprint", false, false, true, m4_errprint },
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| 120 | { "esyscmd", true, false, true, m4_esyscmd },
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| 121 | { "eval", false, false, true, m4_eval },
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| 122 | { "format", true, false, true, m4_format },
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| 123 | { "ifdef", false, false, true, m4_ifdef },
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| 124 | { "ifelse", false, false, true, m4_ifelse },
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| 125 | { "include", false, false, true, m4_include },
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| 126 | { "incr", false, false, true, m4_incr },
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| 127 | { "index", false, false, true, m4_index },
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| 128 | { "indir", true, true, true, m4_indir },
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| 129 | { "len", false, false, true, m4_len },
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| 130 | { "m4exit", false, false, false, m4_m4exit },
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| 131 | { "m4wrap", false, false, true, m4_m4wrap },
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| 132 | { "maketemp", false, false, true, m4_maketemp },
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| 133 | { "mkstemp", false, false, true, m4_mkstemp },
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| 134 | { "patsubst", true, false, true, m4_patsubst },
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| 135 | { "popdef", false, false, true, m4_popdef },
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| 136 | { "pushdef", false, true, true, m4_pushdef },
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| 137 | { "regexp", true, false, true, m4_regexp },
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| 138 | { "shift", false, false, true, m4_shift },
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| 139 | { "sinclude", false, false, true, m4_sinclude },
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| 140 | { "substr", false, false, true, m4_substr },
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| 141 | { "syscmd", false, false, true, m4_syscmd },
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| 142 | { "sysval", false, false, false, m4_sysval },
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| 143 | { "traceoff", false, false, false, m4_traceoff },
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| 144 | { "traceon", false, false, false, m4_traceon },
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| 145 | { "translit", false, false, true, m4_translit },
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| 146 | { "undefine", false, false, true, m4_undefine },
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| 147 | { "undivert", false, false, false, m4_undivert },
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| 148 |
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| 149 | { 0, false, false, false, 0 },
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| 150 |
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| 151 | /* placeholder is intentionally stuck after the table end delimiter,
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| 152 | so that we can easily find it, while not treating it as a real
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| 153 | builtin. */
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| 154 | { "placeholder", true, false, false, m4_placeholder },
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| 155 | };
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| 156 |
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| 157 | static predefined const
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| 158 | predefined_tab[] =
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| 159 | {
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| 160 | #if UNIX
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| 161 | { "unix", "__unix__", "" },
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| 162 | #elif W32_NATIVE
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| 163 | { "windows", "__windows__", "" },
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| 164 | #elif OS2
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| 165 | { "os2", "__os2__", "" },
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| 166 | #else
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| 167 | # warning Platform macro not provided
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| 168 | #endif
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| 169 | { NULL, "__gnu__", "" },
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| 170 |
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| 171 | { NULL, NULL, NULL },
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| 172 | };
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| 173 | |
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| 174 |
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| 175 | /*----------------------------------------.
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| 176 | | Find the builtin, which lives on ADDR. |
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| 177 | `----------------------------------------*/
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| 178 |
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| 179 | const builtin *
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| 180 | find_builtin_by_addr (builtin_func *func)
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| 181 | {
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| 182 | const builtin *bp;
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| 183 |
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| 184 | for (bp = &builtin_tab[0]; bp->name != NULL; bp++)
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| 185 | if (bp->func == func)
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| 186 | return bp;
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| 187 | if (func == m4_placeholder)
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| 188 | return bp + 1;
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| 189 | return NULL;
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| 190 | }
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| 191 |
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| 192 | /*----------------------------------------------------------.
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| 193 | | Find the builtin, which has NAME. On failure, return the |
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| 194 | | placeholder builtin. |
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| 195 | `----------------------------------------------------------*/
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| 196 |
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| 197 | const builtin *
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| 198 | find_builtin_by_name (const char *name)
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| 199 | {
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| 200 | const builtin *bp;
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| 201 |
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| 202 | for (bp = &builtin_tab[0]; bp->name != NULL; bp++)
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| 203 | if (strcmp (bp->name, name) == 0)
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| 204 | return bp;
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| 205 | return bp + 1;
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| 206 | }
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| 207 | |
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| 208 |
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| 209 | /*-------------------------------------------------------------------------.
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| 210 | | Install a builtin macro with name NAME, bound to the C function given in |
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| 211 | | BP. MODE is SYMBOL_INSERT or SYMBOL_PUSHDEF. TRACED defines whether |
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| 212 | | NAME is to be traced. |
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| 213 | `-------------------------------------------------------------------------*/
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| 214 |
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| 215 | void
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| 216 | define_builtin (const char *name, const builtin *bp, symbol_lookup mode)
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| 217 | {
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| 218 | symbol *sym;
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| 219 |
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| 220 | sym = lookup_symbol (name, mode);
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| 221 | SYMBOL_TYPE (sym) = TOKEN_FUNC;
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| 222 | SYMBOL_MACRO_ARGS (sym) = bp->groks_macro_args;
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| 223 | SYMBOL_BLIND_NO_ARGS (sym) = bp->blind_if_no_args;
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| 224 | SYMBOL_FUNC (sym) = bp->func;
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| 225 | }
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| 226 |
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| 227 | /*-------------------------------------------------------------------------.
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| 228 | | Define a predefined or user-defined macro, with name NAME, and expansion |
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| 229 | | TEXT. MODE destinguishes between the "define" and the "pushdef" case. |
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| 230 | | It is also used from main (). |
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| 231 | `-------------------------------------------------------------------------*/
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| 232 |
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| 233 | void
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| 234 | define_user_macro (const char *name, const char *text, symbol_lookup mode)
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| 235 | {
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| 236 | symbol *s;
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| 237 |
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| 238 | s = lookup_symbol (name, mode);
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| 239 | if (SYMBOL_TYPE (s) == TOKEN_TEXT)
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| 240 | free (SYMBOL_TEXT (s));
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| 241 |
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| 242 | SYMBOL_TYPE (s) = TOKEN_TEXT;
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| 243 | SYMBOL_TEXT (s) = xstrdup (text ? text : "");
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| 244 | }
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| 245 |
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| 246 | /*-----------------------------------------------.
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| 247 | | Initialize all builtin and predefined macros. |
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| 248 | `-----------------------------------------------*/
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| 249 |
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| 250 | void
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| 251 | builtin_init (void)
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| 252 | {
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| 253 | const builtin *bp;
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| 254 | const predefined *pp;
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| 255 | char *string;
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| 256 |
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| 257 | for (bp = &builtin_tab[0]; bp->name != NULL; bp++)
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| 258 | if (!no_gnu_extensions || !bp->gnu_extension)
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| 259 | {
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| 260 | if (prefix_all_builtins)
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| 261 | {
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| 262 | string = (char *) xmalloc (strlen (bp->name) + 4);
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| 263 | strcpy (string, "m4_");
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| 264 | strcat (string, bp->name);
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| 265 | define_builtin (string, bp, SYMBOL_INSERT);
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| 266 | free (string);
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| 267 | }
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| 268 | else
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| 269 | define_builtin (bp->name, bp, SYMBOL_INSERT);
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| 270 | }
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| 271 |
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| 272 | for (pp = &predefined_tab[0]; pp->func != NULL; pp++)
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| 273 | if (no_gnu_extensions)
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| 274 | {
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| 275 | if (pp->unix_name != NULL)
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| 276 | define_user_macro (pp->unix_name, pp->func, SYMBOL_INSERT);
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| 277 | }
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| 278 | else
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| 279 | {
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| 280 | if (pp->gnu_name != NULL)
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| 281 | define_user_macro (pp->gnu_name, pp->func, SYMBOL_INSERT);
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| 282 | }
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| 283 | }
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| 284 |
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| 285 | /*------------------------------------------------------------------------.
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| 286 | | Give friendly warnings if a builtin macro is passed an inappropriate |
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| 287 | | number of arguments. NAME is macro name for messages, ARGC is actual |
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| 288 | | number of arguments, MIN is the minimum number of acceptable arguments, |
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| 289 | | negative if not applicable, MAX is the maximum number, negative if not |
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| 290 | | applicable. |
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| 291 | `------------------------------------------------------------------------*/
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| 292 |
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| 293 | static bool
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| 294 | bad_argc (token_data *name, int argc, int min, int max)
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| 295 | {
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| 296 | bool isbad = false;
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| 297 |
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| 298 | if (min > 0 && argc < min)
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| 299 | {
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| 300 | if (!suppress_warnings)
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| 301 | M4ERROR ((warning_status, 0,
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| 302 | "Warning: too few arguments to builtin `%s'",
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| 303 | TOKEN_DATA_TEXT (name)));
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| 304 | isbad = true;
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| 305 | }
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| 306 | else if (max > 0 && argc > max && !suppress_warnings)
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| 307 | M4ERROR ((warning_status, 0,
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| 308 | "Warning: excess arguments to builtin `%s' ignored",
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| 309 | TOKEN_DATA_TEXT (name)));
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| 310 |
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| 311 | return isbad;
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| 312 | }
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| 313 |
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| 314 | /*--------------------------------------------------------------------------.
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| 315 | | The function numeric_arg () converts ARG to an int pointed to by VALUEP. |
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| 316 | | If the conversion fails, print error message for macro MACRO. Return |
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| 317 | | true iff conversion succeeds. |
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| 318 | `--------------------------------------------------------------------------*/
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| 319 |
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| 320 | static bool
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| 321 | numeric_arg (token_data *macro, const char *arg, int *valuep)
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| 322 | {
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| 323 | char *endp;
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| 324 |
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| 325 | if (*arg == '\0')
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| 326 | {
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| 327 | *valuep = 0;
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| 328 | M4ERROR ((warning_status, 0,
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| 329 | "empty string treated as 0 in builtin `%s'",
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| 330 | TOKEN_DATA_TEXT (macro)));
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| 331 | }
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| 332 | else
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| 333 | {
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| 334 | errno = 0;
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| 335 | *valuep = strtol (arg, &endp, 10);
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| 336 | if (*endp != '\0')
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| 337 | {
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| 338 | M4ERROR ((warning_status, 0,
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| 339 | "non-numeric argument to builtin `%s'",
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| 340 | TOKEN_DATA_TEXT (macro)));
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| 341 | return false;
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| 342 | }
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| 343 | if (isspace (to_uchar (*arg)))
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| 344 | M4ERROR ((warning_status, 0,
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| 345 | "leading whitespace ignored in builtin `%s'",
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| 346 | TOKEN_DATA_TEXT (macro)));
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| 347 | else if (errno == ERANGE)
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| 348 | M4ERROR ((warning_status, 0,
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| 349 | "numeric overflow detected in builtin `%s'",
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| 350 | TOKEN_DATA_TEXT (macro)));
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| 351 | }
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| 352 | return true;
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| 353 | }
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| 354 |
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| 355 | /*------------------------------------------------------------------------.
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| 356 | | The function ntoa () converts VALUE to a signed ascii representation in |
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| 357 | | radix RADIX. |
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| 358 | `------------------------------------------------------------------------*/
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| 359 |
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| 360 | /* Digits for number to ascii conversions. */
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| 361 | static char const digits[] = "0123456789abcdefghijklmnopqrstuvwxyz";
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| 362 |
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| 363 | static const char *
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| 364 | ntoa (eval_t value, int radix)
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| 365 | {
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| 366 | bool negative;
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| 367 | unsigned_eval_t uvalue;
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| 368 | static char str[256];
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| 369 | char *s = &str[sizeof str];
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| 370 |
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| 371 | *--s = '\0';
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| 372 |
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| 373 | if (value < 0)
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| 374 | {
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| 375 | negative = true;
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| 376 | uvalue = (unsigned_eval_t) -value;
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| 377 | }
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| 378 | else
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| 379 | {
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| 380 | negative = false;
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| 381 | uvalue = (unsigned_eval_t) value;
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| 382 | }
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| 383 |
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| 384 | do
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| 385 | {
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| 386 | *--s = digits[uvalue % radix];
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| 387 | uvalue /= radix;
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| 388 | }
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| 389 | while (uvalue > 0);
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| 390 |
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| 391 | if (negative)
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| 392 | *--s = '-';
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| 393 | return s;
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| 394 | }
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| 395 |
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| 396 | /*----------------------------------------------------------------------.
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| 397 | | Format an int VAL, and stuff it into an obstack OBS. Used for macros |
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| 398 | | expanding to numbers. |
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| 399 | `----------------------------------------------------------------------*/
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| 400 |
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| 401 | static void
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| 402 | shipout_int (struct obstack *obs, int val)
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| 403 | {
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| 404 | const char *s;
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| 405 |
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| 406 | s = ntoa ((eval_t) val, 10);
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| 407 | obstack_grow (obs, s, strlen (s));
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| 408 | }
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| 409 |
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| 410 | /*----------------------------------------------------------------------.
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| 411 | | Print ARGC arguments from the table ARGV to obstack OBS, separated by |
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| 412 | | SEP, and quoted by the current quotes, if QUOTED is true. |
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| 413 | `----------------------------------------------------------------------*/
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| 414 |
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| 415 | static void
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| 416 | dump_args (struct obstack *obs, int argc, token_data **argv,
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| 417 | const char *sep, bool quoted)
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| 418 | {
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|---|
| 419 | int i;
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|---|
| 420 | size_t len = strlen (sep);
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|---|
| 421 |
|
|---|
| 422 | for (i = 1; i < argc; i++)
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|---|
| 423 | {
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| 424 | if (i > 1)
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| 425 | obstack_grow (obs, sep, len);
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| 426 | if (quoted)
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| 427 | obstack_grow (obs, lquote.string, lquote.length);
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|---|
| 428 | obstack_grow (obs, TOKEN_DATA_TEXT (argv[i]),
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|---|
| 429 | strlen (TOKEN_DATA_TEXT (argv[i])));
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|---|
| 430 | if (quoted)
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|---|
| 431 | obstack_grow (obs, rquote.string, rquote.length);
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|---|
| 432 | }
|
|---|
| 433 | }
|
|---|
| 434 | |
|---|
| 435 |
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|---|
| 436 | /* The rest of this file is code for builtins and expansion of user
|
|---|
| 437 | defined macros. All the functions for builtins have a prototype as:
|
|---|
| 438 |
|
|---|
| 439 | void m4_MACRONAME (struct obstack *obs, int argc, char *argv[]);
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|---|
| 440 |
|
|---|
| 441 | The function are expected to leave their expansion on the obstack OBS,
|
|---|
| 442 | as an unfinished object. ARGV is a table of ARGC pointers to the
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|---|
| 443 | individual arguments to the macro. Please note that in general
|
|---|
| 444 | argv[argc] != NULL. */
|
|---|
| 445 |
|
|---|
| 446 | /* The first section are macros for definining, undefining, examining,
|
|---|
| 447 | changing, ... other macros. */
|
|---|
| 448 |
|
|---|
| 449 | /*-------------------------------------------------------------------------.
|
|---|
| 450 | | The function define_macro is common for the builtins "define", |
|
|---|
| 451 | | "undefine", "pushdef" and "popdef". ARGC and ARGV is as for the caller, |
|
|---|
| 452 | | and MODE argument determines how the macro name is entered into the |
|
|---|
| 453 | | symbol table. |
|
|---|
| 454 | `-------------------------------------------------------------------------*/
|
|---|
| 455 |
|
|---|
| 456 | static void
|
|---|
| 457 | define_macro (int argc, token_data **argv, symbol_lookup mode)
|
|---|
| 458 | {
|
|---|
| 459 | const builtin *bp;
|
|---|
| 460 |
|
|---|
| 461 | if (bad_argc (argv[0], argc, 2, 3))
|
|---|
| 462 | return;
|
|---|
| 463 |
|
|---|
| 464 | if (TOKEN_DATA_TYPE (argv[1]) != TOKEN_TEXT)
|
|---|
| 465 | {
|
|---|
| 466 | M4ERROR ((warning_status, 0,
|
|---|
| 467 | "Warning: %s: invalid macro name ignored", ARG (0)));
|
|---|
| 468 | return;
|
|---|
| 469 | }
|
|---|
| 470 |
|
|---|
| 471 | if (argc == 2)
|
|---|
| 472 | {
|
|---|
| 473 | define_user_macro (ARG (1), "", mode);
|
|---|
| 474 | return;
|
|---|
| 475 | }
|
|---|
| 476 |
|
|---|
| 477 | switch (TOKEN_DATA_TYPE (argv[2]))
|
|---|
| 478 | {
|
|---|
| 479 | case TOKEN_TEXT:
|
|---|
| 480 | define_user_macro (ARG (1), ARG (2), mode);
|
|---|
| 481 | break;
|
|---|
| 482 |
|
|---|
| 483 | case TOKEN_FUNC:
|
|---|
| 484 | bp = find_builtin_by_addr (TOKEN_DATA_FUNC (argv[2]));
|
|---|
| 485 | if (bp == NULL)
|
|---|
| 486 | return;
|
|---|
| 487 | else
|
|---|
| 488 | define_builtin (ARG (1), bp, mode);
|
|---|
| 489 | break;
|
|---|
| 490 |
|
|---|
| 491 | default:
|
|---|
| 492 | M4ERROR ((warning_status, 0,
|
|---|
| 493 | "INTERNAL ERROR: bad token data type in define_macro ()"));
|
|---|
| 494 | abort ();
|
|---|
| 495 | }
|
|---|
| 496 | }
|
|---|
| 497 |
|
|---|
| 498 | static void
|
|---|
| 499 | m4_define (struct obstack *obs, int argc, token_data **argv)
|
|---|
| 500 | {
|
|---|
| 501 | define_macro (argc, argv, SYMBOL_INSERT);
|
|---|
| 502 | }
|
|---|
| 503 |
|
|---|
| 504 | static void
|
|---|
| 505 | m4_undefine (struct obstack *obs, int argc, token_data **argv)
|
|---|
| 506 | {
|
|---|
| 507 | int i;
|
|---|
| 508 | if (bad_argc (argv[0], argc, 2, -1))
|
|---|
| 509 | return;
|
|---|
| 510 | for (i = 1; i < argc; i++)
|
|---|
| 511 | lookup_symbol (ARG (i), SYMBOL_DELETE);
|
|---|
| 512 | }
|
|---|
| 513 |
|
|---|
| 514 | static void
|
|---|
| 515 | m4_pushdef (struct obstack *obs, int argc, token_data **argv)
|
|---|
| 516 | {
|
|---|
| 517 | define_macro (argc, argv, SYMBOL_PUSHDEF);
|
|---|
| 518 | }
|
|---|
| 519 |
|
|---|
| 520 | static void
|
|---|
|
|---|
