aboutsummaryrefslogtreecommitdiffstats
path: root/script.c
blob: e186eb95325a9c8a0003dc8100ca17be0a69e030 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
/* Copyright (C) 1994-1999 Free Software Foundation, Inc.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2, 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 software; see the file COPYING.  If not, write to
 * the Free Software Foundation, 59 Temple Place, Suite 330, Boston, MA 02111, USA.
 *
 * As a special exception, the Free Software Foundation gives permission
 * for additional uses of the text contained in its release of SCM.
 *
 * The exception is that, if you link the SCM library with other files
 * to produce an executable, this does not by itself cause the
 * resulting executable to be covered by the GNU General Public License.
 * Your use of that executable is in no way restricted on account of
 * linking the SCM library code into it.
 *
 * This exception does not however invalidate any other reasons why
 * the executable file might be covered by the GNU General Public License.
 *
 * This exception applies only to the code released by the
 * Free Software Foundation under the name SCM.  If you copy
 * code from other Free Software Foundation releases into a copy of
 * SCM, as the General Public License permits, the exception does
 * not apply to the code that you add in this way.  To avoid misleading
 * anyone as to the status of such modified files, you must delete
 * this exception notice from them.
 *
 * If you write modifications of your own for SCM, it is your choice
 * whether to permit this exception to apply to your modifications.
 * If you do not wish that, delete this exception notice.
 */

/* "script.c" argv tricks for `#!' scripts.
   Author: Aubrey Jaffer */

#include <ctype.h>
#include "scm.h"

#ifdef __IBMC__
# include <io.h>
#endif /* def __IBMC__ */

#ifdef linux
# include <unistd.h>     /* for X_OK define */
#endif /* def linux */
#ifdef __SVR4
# include <unistd.h>     /* for X_OK define */
#else
# ifdef __sgi__
#  include <unistd.h>     /* for X_OK define */
# endif /* def __sgi__ */
#endif /* def __SVR4 */

/* Concatentate str2 onto str1 at position n and return concatenated
   string if file exists; 0 otherwise. */

char *scm_cat_path(str1, str2, n)
     char *str1;
     const char *str2;
     long n;
{
  if (!n) n = strlen(str2);
  if (str1)
    {
      long len = strlen(str1);
      str1 = (char *)realloc(str1, (sizet)(len + n + 1));
      if (!str1) return 0L;
      strncat(str1 + len, str2, n);
      return str1;
    }
  str1 = (char *)malloc((sizet)(n + 1));
  if (!str1) return 0L;
  str1[0] = 0;
  strncat(str1, str2, n);
  return str1;
}

char *scm_try_path(path)
     char *path;
{
  FILE *f;
  /* fprintf(stderr, "Trying %s\n", path);fflush(stderr); */
  if (!path) return 0L;
  SYSCALL(f = fopen(path, "r"););
  if (f) {
    fclose(f);
    return path;
  }
  free(path);
  return 0L;
}

char *scm_sep_init_try(path, sep, initname)
     char *path;
     const char *sep, *initname;
{
  if (path) path = scm_cat_path(path, sep, 0L);
  if (path) path = scm_cat_path(path, initname, 0L);
  return scm_try_path(path);
}

#ifndef LINE_INCREMENTORS
# define LINE_INCREMENTORS  '\n'
# ifdef MSDOS
#  define WHITE_SPACES  ' ':case '\t':case '\r':case '\f':case 26
# else
#  define WHITE_SPACES  ' ':case '\t':case '\r':case '\f'
# endif /* def MSDOS */
#endif /* ndef LINE_INCREMENTORS */

#ifndef MAXPATHLEN
# define MAXPATHLEN 80
#endif /* ndef MAXPATHLEN */
#ifndef X_OK
# define X_OK 1
#endif /* ndef X_OK */

#ifdef HAVE_UNIX
# include <stdio.h>

char *script_find_executable(name)
     const char *name;
{
  char tbuf[MAXPATHLEN];
  int i = 0;
  FILE *f;

  /* fprintf(stderr, "s_f_e checking access %s ->%d\n", name, access(name, X_OK)); fflush(stderr); */
  if (access(name, X_OK)) return 0L;
  f = fopen(name, "r");
  if (!f) return 0L;
  if ((fgetc(f)=='#') && (fgetc(f)=='!')) {
    while (1) switch (tbuf[i++] = fgetc(f)) {
    case ' ':
      if (1==i) {i--; break;}
    case '\t':case '\r':case '\f':
    case EOF:
      tbuf[--i] = 0;
      fclose(f);
      if (0==i) return 0L;
      return scm_cat_path(0L, tbuf, 0L);
    }
  }
  fclose(f);
  return scm_cat_path(0L, name, 0L);
}
#endif /* unix */

/* Given dld_find_executable()'s best guess for the pathname of this
   executable, find (and verify the existence of) initname in the
   implementation-vicinity of this program.  Returns a newly allocated
   string if successful, 0 if not */

char *find_impl_file(exec_path, generic_name, initname, sep)
     char *exec_path;
     const char *generic_name, *initname, *sep;
{
  char *sepptr = strrchr(exec_path, sep[0]);
  char *extptr = exec_path + strlen(exec_path);
  char *path = 0;
  /* fprintf(stderr, "dld_find_e %s\n", exec_path); fflush(stderr); */
  if (sepptr) {
    long sepind = sepptr - exec_path + 1L;

    /* In case exec_path is in the source directory, look first in
       exec_path's directory. */
    path = scm_cat_path(0L, exec_path, sepind - 1L);
    path = scm_sep_init_try(path, sep, initname);
    if (path) return path;

#ifdef MSDOS
    if (!strcmp(extptr - 4, ".exe") || !strcmp(extptr - 4, ".com") ||
	!strcmp(extptr - 4, ".EXE") || !strcmp(extptr - 4, ".COM"))
      extptr = extptr - 4;
#endif /* def MSDOS */

    if (generic_name &&
	!strncmp(exec_path + sepind, generic_name, extptr - exec_path))
      generic_name = 0;

    /* If exec_path is in directory "exe" or "bin": */
    path = scm_cat_path(0L, exec_path, sepind - 1L);
    sepptr = path + sepind - 4;
    if (!strcmp(sepptr, "exe") || !strcmp(sepptr, "bin") ||
	!strcmp(sepptr, "EXE") || !strcmp(sepptr, "BIN")) {
      char *peer;

      /* Look for initname in peer directory "lib". */
      if (path) {
	strncpy(sepptr, "lib", 3);
	path = scm_sep_init_try(path, sep, initname);
	if (path) return path;
      }

      /* Look for initname in peer directories "lib" and "src" in
	 subdirectory with the name of the executable (sans any type
	 extension like .EXE). */
      for(peer="lib";!0;peer="src") {
	path = scm_cat_path(0L, exec_path, extptr - exec_path + 0L);
	if (path) {
	  strncpy(path + sepind - 4, peer, 3);
	  path[extptr - exec_path] = 0;
	  path = scm_sep_init_try(path, sep, initname);
	  if (path) return path;
	}
	if (!strcmp(peer, "src")) break;
      }

      if (generic_name) {

	/* Look for initname in peer directories "lib" and "src" in
	   subdirectory with the generic name. */
	for(peer="lib";!0;peer="src") {
	  path = scm_cat_path(0L, exec_path, sepind);
	  if (path) {
	    strncpy(path + sepind - 4, peer, 3);
	    path = scm_cat_path(path, generic_name, 0L);
	    path = scm_sep_init_try(path, sep, initname);
	    if (path) return path;
	  }
	  if (!strcmp(peer, "src")) break;
	}}

      /* Look for initname in executable-name peer directory. */
      path = scm_cat_path(0L, exec_path, sepind);
      if (path) {
	path[sepind - 4] = 0;
	path = scm_cat_path(path, &exec_path[sepind], 0L);
	path = scm_sep_init_try(path, sep, initname);
	if (path) return path;
      }

      if (generic_name) {

	/* Look for initname in generic peer directory. */
	path = scm_cat_path(0L, exec_path, sepind);
	if (path) {
	  path[sepind - 4] = 0;
	  path = scm_cat_path(path, generic_name, 0L);
	  path = scm_sep_init_try(path, sep, initname);
	  if (path) return path;
	}
      }
    }

#ifdef MSDOS
    if (strlen(extptr)) {
      /* If exec_path has type extension, look in a subdirectory with
	 the name of the executable sans the executable file's type
	 extension. */
      path = scm_cat_path(0L, exec_path, extptr - exec_path + 0L);
      path = scm_sep_init_try(path, sep, initname);
      if (path) return path;

      if (generic_name) {

	/* Also look in generic_name subdirectory. */
	path = scm_cat_path(0L, exec_path, sepind);
	if (path) path = scm_cat_path(path, generic_name, 0L);
	path = scm_sep_init_try(path, sep, initname);
	if (path) return path;
      }}
#endif /* def MSDOS */
  }
  else {

    /* We don't have a parse-able exec_path.  The only path to try is
       just initname. */
    path = scm_cat_path(0L, initname, 0L);
    if (path) path = scm_try_path(path);
    if (path) return path;
  }
  return 0L;
}

char *script_read_arg(f)
     FILE *f;
{
  sizet tlen = 1;
  int tind = 0, qted = 0, chr;
  char *tbuf = (char *)malloc((1 + tlen) * sizeof(char));
  if (!tbuf) return 0L;
  while (1) switch (chr = getc(f)) {
  case WHITE_SPACES:
    continue;
  case LINE_INCREMENTORS:
  case EOF:
    free(tbuf);
    return 0L;
  default:
    goto morearg;
  }
morearg:
  while (1) {
    switch (tbuf[tind++] = chr) {
    case WHITE_SPACES:
    case LINE_INCREMENTORS:
      if (qted) break;
    case EOF: goto endarg;
    case '!':
      if (qted) break;
      switch (chr = getc(f)) {
      case '#':
	if (1==tind) return 0L;
	goto endarg;
      default: tbuf[tind++] = chr; break;
      }
      break;
    case '"': qted = !qted; tind--; break;
    case '\\':
      switch (tbuf[tind - 1] = getc(f)) {
      case '\n': --tind; break;
      case 'n': tbuf[tind - 1] = '\n'; break;
      case 'r': tbuf[tind - 1] = '\r'; break;
      case 't': tbuf[tind - 1] = '\t'; break;
      case 'b': tbuf[tind - 1] = '\b'; break;
	/* case '0': tbuf[tind - 1] = '\0'; break; */
      default:;
      }
    default:;
    }
    if (tind >= tlen) {
      tbuf = (char *)realloc(tbuf, (1 + (2 * tlen)) * sizeof(char));
      if (!tbuf) return 0L;
      tlen = 2 * tlen;
    }
    chr = getc(f);
  }
endarg:
  tbuf[--tind] = 0;
  return tbuf;
}

int script_meta_arg_P(arg)
     char *arg;
{
  if ('\\' != arg[0]) return 0L;
#ifdef MSDOS
  return !arg[1];
#else
  switch (arg[1]) {
  case 0:
  case '%':
  case WHITE_SPACES: return !0;
  default: return 0L;}
#endif
}

char **script_process_argv(argc, argv)
     int argc;
     char **argv;
{
  int nargc = argc, argi = 1, nargi = 1;
  char *narg, **nargv;
  if (!(argc > 2 && script_meta_arg_P(argv[1]))) return 0L;
  if (!(nargv = (char **)malloc((1 + nargc) * sizeof(char *)))) return 0L;
  nargv[0] = argv[0];
  while (((argi+1) < argc) && (script_meta_arg_P(argv[argi]))) {
    FILE *f = fopen(argv[++argi], "r");
    if (f) {
      nargc--;		/* to compensate for replacement of '\\' */
      while (1) switch (getc(f)) {
      case EOF: return 0L;
      default: continue;
      case '\n': goto found_args;
      }
    found_args: while ((narg = script_read_arg(f)))
      if (!(nargv = (char **)realloc(nargv, (1 + ++nargc) * sizeof(char *))))
	return 0L;
      else nargv[nargi++] = narg;
      fclose(f);
      nargv[nargi++] = argv[argi++];
    }
  }
  while (argi <= argc) nargv[nargi++] = argv[argi++];
  return nargv;
}

int script_count_argv(argv)
     char **argv;
{
  int argc = 0;
  while (argv[argc]) argc++;
  return argc;
}

#ifdef __IBMC__
# define MSDOS
#endif

#ifdef MSDOS
char *dld_find_executable(file)
     const char *file;
{
  /* fprintf(stderr, "dld_find_executable %s -> %s\n", file, scm_cat_path(0L, file, 0L)); fflush(stderr); */
  return scm_cat_path(0L, file, 0L);
}
#endif /* def MSDOS */