ar.c

   1 /* Interface to `ar' archives for GNU Make.
   2 Copyright (C) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997,
   3 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007 Free Software
   4 Foundation, Inc.
   5 This file is part of GNU Make.
   6
   7 GNU Make is free software; you can redistribute it and/or modify it under the
   8 terms of the GNU General Public License as published by the Free Software
   9 Foundation; either version 3 of the License, or (at your option) any later
  10 version.
  11
  12 GNU Make is distributed in the hope that it will be useful, but WITHOUT ANY
  13 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
  14 A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License along with
  17 this program.  If not, see <http://www.gnu.org/licenses/>.  */
  18
  19 #include "make.h"
  20
  21 #ifndef NO_ARCHIVES
  22
  23 #include "filedef.h"
  24 #include "dep.h"
  25 #include <fnmatch.h>
  26
  27 /* Return nonzero if NAME is an archive-member reference, zero if not.  An
  28    archive-member reference is a name like `lib(member)' where member is a
  29    non-empty string.
  30    If a name like `lib((entry))' is used, a fatal error is signaled at
  31    the attempt to use this unsupported feature.  */
  32
  33 int
  34 ar_name (const char *name)
  35 {
  36   const char *p = strchr (name, '(');
  37   const char *end;
  38
  39   if (p == 0 || p == name)
  40     return 0;
  41
  42   end = p + strlen (p) - 1;
  43   if (*end != ')' || end == p + 1)
  44     return 0;
  45
  46   if (p[1] == '(' && end[-1] == ')')
  47     fatal (NILF, _("attempt to use unsupported feature: `%s'"), name);
  48
  49   return 1;
  50 }
  51
  52
  53 /* Parse the archive-member reference NAME into the archive and member names.
  54    Creates one allocated string containing both names, pointed to by ARNAME_P.
  55    MEMNAME_P points to the member.  */
  56
  57 void
  58 ar_parse_name (const char *name, char **arname_p, char **memname_p)
  59 {
  60   char *p;
  61
  62   *arname_p = xstrdup (name);
  63   p = strchr (*arname_p, '(');
  64   *(p++) = '\0';
  65   p[strlen(p) - 1] = '\0';
  66   *memname_p = p;
  67 }
  68 \f
  69
  70 /* This function is called by `ar_scan' to find which member to look at.  */
  71
  72 /* ARGSUSED */
  73 static long int
  74 ar_member_date_1 (int desc UNUSED, const char *mem, int truncated,
  75                   long int hdrpos UNUSED, long int datapos UNUSED,
  76                   long int size UNUSED, long int date,
  77                   int uid UNUSED, int gid UNUSED, int mode UNUSED,
  78                   const void *name)
  79 {
  80   return ar_name_equal (name, mem, truncated) ? date : 0;
  81 }
  82
  83 /* Return the modtime of NAME.  */
  84
  85 time_t
  86 ar_member_date (const char *name)
  87 {
  88   char *arname;
  89   char *memname;
  90   long int val;
  91
  92   ar_parse_name (name, &arname, &memname);
  93
  94   /* Make sure we know the modtime of the archive itself because we are
  95      likely to be called just before commands to remake a member are run,
  96      and they will change the archive itself.
  97
  98      But we must be careful not to enter_file the archive itself if it does
  99      not exist, because pattern_search assumes that files found in the data
 100      base exist or can be made.  */
 101   {
 102     struct file *arfile;
 103     arfile = lookup_file (arname);
 104     if (arfile == 0 && file_exists_p (arname))
 105       arfile = enter_file (strcache_add (arname));
 106
 107     if (arfile != 0)
 108       (void) f_mtime (arfile, 0);
 109   }
 110
 111   val = ar_scan (arname, ar_member_date_1, memname);
 112
 113   free (arname);
 114
 115   return (val <= 0 ? (time_t) -1 : (time_t) val);
 116 }
 117 \f
 118 /* Set the archive-member NAME's modtime to now.  */
 119
 120 #ifdef VMS
 121 int
 122 ar_touch (const char *name)
 123 {
 124   error (NILF, _("touch archive member is not available on VMS"));
 125   return -1;
 126 }
 127 #else
 128 int
 129 ar_touch (const char *name)
 130 {
 131   char *arname, *memname;
 132   int val;
 133
 134   ar_parse_name (name, &arname, &memname);
 135
 136   /* Make sure we know the modtime of the archive itself before we
 137      touch the member, since this will change the archive modtime.  */
 138   {
 139     struct file *arfile;
 140     arfile = enter_file (strcache_add (arname));
 141     f_mtime (arfile, 0);
 142   }
 143
 144   val = 1;
 145   switch (ar_member_touch (arname, memname))
 146     {
 147     case -1:
 148       error (NILF, _("touch: Archive `%s' does not exist"), arname);
 149       break;
 150     case -2:
 151       error (NILF, _("touch: `%s' is not a valid archive"), arname);
 152       break;
 153     case -3:
 154       perror_with_name ("touch: ", arname);
 155       break;
 156     case 1:
 157       error (NILF,
 158              _("touch: Member `%s' does not exist in `%s'"), memname, arname);
 159       break;
 160     case 0:
 161       val = 0;
 162       break;
 163     default:
 164       error (NILF,
 165              _("touch: Bad return code from ar_member_touch on `%s'"), name);
 166     }
 167
 168   free (arname);
 169
 170   return val;
 171 }
 172 #endif /* !VMS */
 173 \f
 174 /* State of an `ar_glob' run, passed to `ar_glob_match'.  */
 175
 176 struct ar_glob_state
 177   {
 178     const char *arname;
 179     const char *pattern;
 180     unsigned int size;
 181     struct nameseq *chain;
 182     unsigned int n;
 183   };
 184
 185 /* This function is called by `ar_scan' to match one archive
 186    element against the pattern in STATE.  */
 187
 188 static long int
 189 ar_glob_match (int desc UNUSED, const char *mem, int truncated UNUSED,
 190                long int hdrpos UNUSED, long int datapos UNUSED,
 191                long int size UNUSED, long int date UNUSED, int uid UNUSED,
 192                int gid UNUSED, int mode UNUSED, const void *arg)
 193 {
 194   struct ar_glob_state *state = (struct ar_glob_state *)arg;
 195
 196   if (fnmatch (state->pattern, mem, FNM_PATHNAME|FNM_PERIOD) == 0)
 197     {
 198       /* We have a match.  Add it to the chain.  */
 199       struct nameseq *new = xmalloc (state->size);
 200       memset (new, '\0', state->size);
 201       new->name = strcache_add (concat (state->arname, mem, ")"));
 202       new->next = state->chain;
 203       state->chain = new;
 204       ++state->n;
 205     }
 206
 207   return 0L;
 208 }
 209
 210 /* Return nonzero if PATTERN contains any metacharacters.
 211    Metacharacters can be quoted with backslashes if QUOTE is nonzero.  */
 212 static int
 213 glob_pattern_p (const char *pattern, int quote)
 214 {
 215   const char *p;
 216   int open = 0;
 217
 218   for (p = pattern; *p != '\0'; ++p)
 219     switch (*p)
 220       {
 221       case '?':
 222       case '*':
 223         return 1;
 224
 225       case '\\':
 226         if (quote)
 227           ++p;
 228         break;
 229
 230       case '[':
 231         open = 1;
 232         break;
 233
 234       case ']':
 235         if (open)
 236           return 1;
 237         break;
 238       }
 239
 240   return 0;
 241 }
 242
 243 /* Glob for MEMBER_PATTERN in archive ARNAME.
 244    Return a malloc'd chain of matching elements (or nil if none).  */
 245
 246 struct nameseq *
 247 ar_glob (const char *arname, const char *member_pattern, unsigned int size)
 248 {
 249   struct ar_glob_state state;
 250   struct nameseq *n;
 251   const char **names;
 252   char *name;
 253   unsigned int i;
 254
 255   if (! glob_pattern_p (member_pattern, 1))
 256     return 0;
 257
 258   /* Scan the archive for matches.
 259      ar_glob_match will accumulate them in STATE.chain.  */
 260   i = strlen (arname);
 261   name = alloca (i + 2);
 262   memcpy (name, arname, i);
 263   name[i] = '(';
 264   name[i + 1] = '\0';
 265   state.arname = name;
 266   state.pattern = member_pattern;
 267   state.size = size;
 268   state.chain = 0;
 269   state.n = 0;
 270   ar_scan (arname, ar_glob_match, &state);
 271
 272   if (state.chain == 0)
 273     return 0;
 274
 275   /* Now put the names into a vector for sorting.  */
 276   names = alloca (state.n * sizeof (const char *));
 277   i = 0;
 278   for (n = state.chain; n != 0; n = n->next)
 279     names[i++] = n->name;
 280
 281   /* Sort them alphabetically.  */
 282   qsort (names, i, sizeof (*names), alpha_compare);
 283
 284   /* Put them back into the chain in the sorted order.  */
 285   i = 0;
 286   for (n = state.chain; n != 0; n = n->next)
 287     n->name = names[i++];
 288
 289   return state.chain;
 290 }
 291
 292 #endif  /* Not NO_ARCHIVES.  */