File: chpl.c

package info (click to toggle)
swi-prolog 3.1.0-2
  • links: PTS
  • area: main
  • in suites: slink
  • size: 8,772 kB
  • ctags: 12,869
  • sloc: ansic: 43,657; perl: 12,577; lisp: 4,359; sh: 1,534; makefile: 798; awk: 14
file content (413 lines) | stat: -rw-r--r-- 7,481 bytes parent folder | download | duplicates (3)
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
408
409
410
411
412
413
/*  $Id: chpl.c,v 1.4 1996/02/19 15:55:53 jan Exp $

    Designed and implemented by Jan Wielemaker
    E-mail: jan@swi.psy.uva.nl

    Copyright (C) 1995 University of Amsterdam. All rights reserved.
*/

#include "pl-incl.h"
#include <stdio.h>
#include <string.h>
#include <stdarg.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef HAVE_SYS_FILE_H
#include <sys/file.h>
#endif
#include <stdlib.h>
#include <sys/stat.h>
#include <errno.h>

#define closeFiles chplCloseFiles
#define warning chplWarning

#ifndef EOS
#define EOS '\0'
#endif
#define MAXLINE 1024
#ifndef MAXPATHLEN
#define MAXPATHLEN 1024
#endif

#define ENDHEADER "# End Header\n"

#define VERBOSE(g) if ( verbose ) { g; }

static char *program;
static char *state      = NULL;		/* program to work on */
static char *emulator   = NULL;		/* -e */
static char *outfile    = NULL;		/* -o */
static char *headerfile = NULL;		/* -h */
static int  verbose     = 0;		/* -v */
static int  extract     = 0;		/* -x */

void
warning(char *fm, ...)
{ va_list args;

  va_start(args, fm);
  fprintf(stderr, "%s: ", program);
  vfprintf(stderr, fm, args);
  fprintf(stderr, "\n");
  va_end(args);
}


void
usage()
{ fprintf(stderr, "usage: %s -e emulator [-o outfile] state\n", program);
  fprintf(stderr, "   or: %s -x [-o outfile] state\n", program);
  fprintf(stderr, "   or: %s -h header [-o outfile] state\n", program);

  exit(1);
}


char *
OsError(void)
{
#ifdef HAVE_STRERROR
#ifdef __WIN32__
  return strerror(_xos_errno());
#else
  return strerror(errno);
#endif
#else /*HAVE_STRERROR*/
  static char errmsg[64];

#if unix
  extern int sys_nerr;
#if !EMX
  extern char *sys_errlist[];
#endif
  extern int errno;

  if ( errno < sys_nerr )
    return sys_errlist[errno];
#endif

  sprintf(errmsg, "Unknown Error (%d)", errno);
  return errmsg;
#endif /*HAVE_STRERROR*/
}


int
replacevar(char *line, char *var, char *value)
{ char *s;
  int varl = strlen(var);

  for(s=line; *s; s++)
  { if ( *s == '$' && s[1] == '{' )
    { s += 2;
      if ( strncmp(s, var, varl) == 0 && s[varl] == '-' )
      { char *e;

	s += varl+1;
	if ( (e = strchr(s, '}')) )
	{ char buf[MAXLINE];

	  strcpy(buf, e);
	  strcpy(s, value);
	  strcat(s, buf);
	  return 1;
	}
      }
    }
  }

  return 0;
}


static int
cpmode(char *from, char *to)
{ struct stat buf;

  if ( stat(from, &buf) == 0 )
  { return chmod(to, buf.st_mode);
  }

  return -1;
}


static int
openFiles(char *qlf, char *outfile, char *tmpqlf, FILE **in, FILE **out)
{ strcpy(tmpqlf, ".");
  strcat(tmpqlf, outfile);

  if ( (*in = fopen(qlf, "rb")) == NULL )
  { warning("cannot open %s: %s", qlf, OsError());
    return 1;
  }
  if ( (*out = fopen(tmpqlf, "wb")) == NULL )
  { warning("cannot open %s: %s", tmpqlf, OsError());
    return 1;
  }

  return 0;
}

static int
closeFiles(char *qlf, char *outfile, char *tmpqlf, FILE *in, FILE *out)
{ if ( ferror(in) )
  { warning("Error reading %s: %s\n", qlf, OsError());
    return 1;
  }
  if ( ferror(out) )
  { warning("Error writing %s: %s\n", tmpqlf, OsError());
    return 1;
  }

  fclose(in);
  fclose(out);

  if ( cpmode(qlf, tmpqlf) != 0 )
    warning("failed to copy mode from %s to %s: %s", qlf, tmpqlf, OsError());

  if ( rename(tmpqlf, outfile) )
  { warning("failed to rename %s into %s: %s", tmpqlf, qlf, OsError());
    return 1;
  }

  return 0;
}


static int
copyFd(FILE *in, FILE *out, char *infile, char *outfile)
{ char line[MAXLINE];

  for(;;)
  { char *s;
    int n;

    for(s=line, n=0; n<sizeof(line); n++)
    { int c = fgetc(in);

      if ( c == EOF )
      { char *q = line;

	for( ; q<s; q++)
	{ if ( fputc(*q, out) < 0 )
	  { warning("write failed on %s: %s", outfile, OsError());
	    return 1;
	  }
	}
	return 0;
      } else
	*s++ = c;
    }
    for(s=line, n=0; n<sizeof(line); n++)
    { if ( fputc(*s++, out) < 0 )
      { warning("write failed on %s: %s", outfile, OsError());
	return 1;
      }
    }
  }
}


int
changeEmulator(char *qlf, char *emulator, char *outfile)
{ char tmpqlf[MAXPATHLEN];
  char line[MAXLINE];
  FILE *in, *out;
  int n;

  if ( openFiles(qlf, outfile, tmpqlf, &in, &out) )
    return 1;

  for(n=0; n<100; n++)
  { if ( !fgets(line, sizeof(line), in) )
    { warning("%s: not a SWI-Prolog saved state", qlf);
      return 1;
    }
    if ( replacevar(line, "SWIPL", emulator) )
    { fputs(line, out);
      goto copy;
    }
    fputs(line, out);
  }
  warning("%s: not a SWI-Prolog saved state", qlf);
  return 1;

copy:
  if ( copyFd(in, out, qlf, tmpqlf) )
    return 1;

  return closeFiles(qlf, outfile, tmpqlf, in, out);
}


int
extractHeader(char *qlf, char *outfile)
{ FILE *in, *out;
  char line[MAXLINE];

  if ( (in = fopen(qlf, "rb")) == NULL )
  { warning("cannot open %s: %s", qlf, OsError());
    return 1;
  }
  if ( !outfile )
    out = stdout;
  else
  { if ( (out = fopen(outfile, "wb")) == NULL )
    { warning("cannot open %s: %s", outfile, OsError());
      return 1;
    }
  }

  for(;;)
  { if ( !fgets(line, sizeof(line), in) )
    { warning("%s: Could not find %s", qlf, ENDHEADER);
      return 1;
    }

    if ( strcmp(line, ENDHEADER) == 0 )
      break;

    if ( fputs(line, out) < 0 )
    { warning("write failed: %s\n", OsError());
      return 1;
    }
  }

  fflush(out);
  if ( outfile )
    fclose(out);
  fclose(in);

  return 0;
}


static int
skipHeader(FILE *in, char *file)
{ char line[MAXLINE];

  for(;;)
  { if ( !fgets(line, sizeof(line), in) )
    { warning("%s: Could not find %s", file, ENDHEADER);
      return 1;
    }
    if ( strcmp(line, ENDHEADER) == 0 )
      break;
  }

  return 0;
}


int
replaceHeader(char *qlf, char *headerfile, char *outfile)
{ char tmpqlf[MAXPATHLEN];
  FILE *in, *out, *hf;

  if ( openFiles(qlf, outfile, tmpqlf, &in, &out) )
    return 1;

  if ( strcmp(headerfile, "-") == 0 )
    hf = stdin;
  else if ( (hf = fopen(headerfile, "r")) == NULL )
  { warning("Failed to open %s: %s", headerfile, OsError());
    return 1;
  }
  
  if ( copyFd(hf, out, headerfile, tmpqlf) )
    return 1;
  fprintf(out, "%s", ENDHEADER);
  if ( skipHeader(in, qlf) ||
       copyFd(in, out, qlf, tmpqlf) )
    return 1;

  return closeFiles(qlf, outfile, tmpqlf, in, out);
}


char *
baseName(char *path)
{ char *b;

  for(b=path; *path; path++)
  { if ( *path == '/' )
      b = &path[1];
  }

  return b;
}


int
main(int argc, char **argv)
{ program = baseName(argv[0]);

  argc--; argv++;
  while(argc > 0 && argv[0][0] == '-')
  { char *opts = &argv[0][1];

    argc--; argv++;
    for(; *opts; opts++)
    { switch(*opts)
      { case 'e':
	  if ( argc <= 0 )
	    usage();
	  emulator = argv[0];
	  argc--; argv++;
	  continue;
	case 'o':
	  if ( argc <= 0 )
	    usage();
	  outfile = argv[0];
	  argc--; argv++;
	  continue;
	case 'x':
	  extract++;
	  continue;
	case 'h':
	  if ( argc <= 0 )
	    usage();
	  headerfile = argv[0];
	  argc--; argv++;
	case 'v':
	  verbose++;
	  continue;
      }
    }
  }

  if ( argc != 1 )
    usage();
  state = argv[0];

  if ( extract )
  { exit(extractHeader(state, outfile));
  }

  if ( !outfile )
    outfile = state;

  if ( headerfile )
  { exit(replaceHeader(state, headerfile, outfile));
  }

  if ( emulator )
  { if ( emulator[0] != '/' )
    { warning("Path to emulator must be absolute");
      exit(1);
    }
    if ( access(emulator, X_OK) != 0 )
      warning("%s: emulator is not executable: %s\n", emulator, OsError());


    exit(changeEmulator(state, emulator, outfile));
  }

  usage();
  return 1;
}