Fix svq3_* function declarations.
[libav.git] / cmdutils.c
1 /*
2 * Various utilities for command line tools
3 * Copyright (c) 2000-2003 Fabrice Bellard
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22 #include <string.h>
23 #include <stdlib.h>
24 #include <errno.h>
25 #include <math.h>
26
27 /* Include only the enabled headers since some compilers (namely, Sun
28 Studio) will not omit unused inline functions and create undefined
29 references to libraries that are not being built. */
30
31 #include "config.h"
32 #include "libavformat/avformat.h"
33 #include "libavfilter/avfilter.h"
34 #include "libavdevice/avdevice.h"
35 #include "libswscale/swscale.h"
36 #include "libpostproc/postprocess.h"
37 #include "libavutil/avstring.h"
38 #include "libavcodec/opt.h"
39 #include "cmdutils.h"
40 #include "version.h"
41 #if CONFIG_NETWORK
42 #include "libavformat/network.h"
43 #endif
44 #if HAVE_SYS_RESOURCE_H
45 #include <sys/resource.h>
46 #endif
47
48 #undef exit
49
50 const char **opt_names;
51 static int opt_name_count;
52 AVCodecContext *avcodec_opts[CODEC_TYPE_NB];
53 AVFormatContext *avformat_opts;
54 struct SwsContext *sws_opts;
55
56 const int this_year = 2010;
57
58 double parse_number_or_die(const char *context, const char *numstr, int type, double min, double max)
59 {
60 char *tail;
61 const char *error;
62 double d = strtod(numstr, &tail);
63 if (*tail)
64 error= "Expected number for %s but found: %s\n";
65 else if (d < min || d > max)
66 error= "The value for %s was %s which is not within %f - %f\n";
67 else if(type == OPT_INT64 && (int64_t)d != d)
68 error= "Expected int64 for %s but found %s\n";
69 else
70 return d;
71 fprintf(stderr, error, context, numstr, min, max);
72 exit(1);
73 }
74
75 int64_t parse_time_or_die(const char *context, const char *timestr, int is_duration)
76 {
77 int64_t us = parse_date(timestr, is_duration);
78 if (us == INT64_MIN) {
79 fprintf(stderr, "Invalid %s specification for %s: %s\n",
80 is_duration ? "duration" : "date", context, timestr);
81 exit(1);
82 }
83 return us;
84 }
85
86 void show_help_options(const OptionDef *options, const char *msg, int mask, int value)
87 {
88 const OptionDef *po;
89 int first;
90
91 first = 1;
92 for(po = options; po->name != NULL; po++) {
93 char buf[64];
94 if ((po->flags & mask) == value) {
95 if (first) {
96 printf("%s", msg);
97 first = 0;
98 }
99 av_strlcpy(buf, po->name, sizeof(buf));
100 if (po->flags & HAS_ARG) {
101 av_strlcat(buf, " ", sizeof(buf));
102 av_strlcat(buf, po->argname, sizeof(buf));
103 }
104 printf("-%-17s %s\n", buf, po->help);
105 }
106 }
107 }
108
109 static const OptionDef* find_option(const OptionDef *po, const char *name){
110 while (po->name != NULL) {
111 if (!strcmp(name, po->name))
112 break;
113 po++;
114 }
115 return po;
116 }
117
118 void parse_options(int argc, char **argv, const OptionDef *options,
119 void (* parse_arg_function)(const char*))
120 {
121 const char *opt, *arg;
122 int optindex, handleoptions=1;
123 const OptionDef *po;
124
125 /* parse options */
126 optindex = 1;
127 while (optindex < argc) {
128 opt = argv[optindex++];
129
130 if (handleoptions && opt[0] == '-' && opt[1] != '\0') {
131 int bool_val = 1;
132 if (opt[1] == '-' && opt[2] == '\0') {
133 handleoptions = 0;
134 continue;
135 }
136 opt++;
137 po= find_option(options, opt);
138 if (!po->name && opt[0] == 'n' && opt[1] == 'o') {
139 /* handle 'no' bool option */
140 po = find_option(options, opt + 2);
141 if (!(po->name && (po->flags & OPT_BOOL)))
142 goto unknown_opt;
143 bool_val = 0;
144 }
145 if (!po->name)
146 po= find_option(options, "default");
147 if (!po->name) {
148 unknown_opt:
149 fprintf(stderr, "%s: unrecognized option '%s'\n", argv[0], opt);
150 exit(1);
151 }
152 arg = NULL;
153 if (po->flags & HAS_ARG) {
154 arg = argv[optindex++];
155 if (!arg) {
156 fprintf(stderr, "%s: missing argument for option '%s'\n", argv[0], opt);
157 exit(1);
158 }
159 }
160 if (po->flags & OPT_STRING) {
161 char *str;
162 str = av_strdup(arg);
163 *po->u.str_arg = str;
164 } else if (po->flags & OPT_BOOL) {
165 *po->u.int_arg = bool_val;
166 } else if (po->flags & OPT_INT) {
167 *po->u.int_arg = parse_number_or_die(opt, arg, OPT_INT64, INT_MIN, INT_MAX);
168 } else if (po->flags & OPT_INT64) {
169 *po->u.int64_arg = parse_number_or_die(opt, arg, OPT_INT64, INT64_MIN, INT64_MAX);
170 } else if (po->flags & OPT_FLOAT) {
171 *po->u.float_arg = parse_number_or_die(opt, arg, OPT_FLOAT, -1.0/0.0, 1.0/0.0);
172 } else if (po->flags & OPT_FUNC2) {
173 if(po->u.func2_arg(opt, arg)<0)
174 goto unknown_opt;
175 } else {
176 po->u.func_arg(arg);
177 }
178 if(po->flags & OPT_EXIT)
179 exit(0);
180 } else {
181 if (parse_arg_function)
182 parse_arg_function(opt);
183 }
184 }
185 }
186
187 int opt_default(const char *opt, const char *arg){
188 int type;
189 int ret= 0;
190 const AVOption *o= NULL;
191 int opt_types[]={AV_OPT_FLAG_VIDEO_PARAM, AV_OPT_FLAG_AUDIO_PARAM, 0, AV_OPT_FLAG_SUBTITLE_PARAM, 0};
192
193 for(type=0; type<CODEC_TYPE_NB && ret>= 0; type++){
194 const AVOption *o2 = av_find_opt(avcodec_opts[0], opt, NULL, opt_types[type], opt_types[type]);
195 if(o2)
196 ret = av_set_string3(avcodec_opts[type], opt, arg, 1, &o);
197 }
198 if(!o)
199 ret = av_set_string3(avformat_opts, opt, arg, 1, &o);
200 if(!o)
201 ret = av_set_string3(sws_opts, opt, arg, 1, &o);
202 if(!o){
203 if(opt[0] == 'a')
204 ret = av_set_string3(avcodec_opts[CODEC_TYPE_AUDIO], opt+1, arg, 1, &o);
205 else if(opt[0] == 'v')
206 ret = av_set_string3(avcodec_opts[CODEC_TYPE_VIDEO], opt+1, arg, 1, &o);
207 else if(opt[0] == 's')
208 ret = av_set_string3(avcodec_opts[CODEC_TYPE_SUBTITLE], opt+1, arg, 1, &o);
209 }
210 if (o && ret < 0) {
211 fprintf(stderr, "Invalid value '%s' for option '%s'\n", arg, opt);
212 exit(1);
213 }
214 if(!o)
215 return -1;
216
217 // av_log(NULL, AV_LOG_ERROR, "%s:%s: %f 0x%0X\n", opt, arg, av_get_double(avcodec_opts, opt, NULL), (int)av_get_int(avcodec_opts, opt, NULL));
218
219 //FIXME we should always use avcodec_opts, ... for storing options so there will not be any need to keep track of what i set over this
220 opt_names= av_realloc(opt_names, sizeof(void*)*(opt_name_count+1));
221 opt_names[opt_name_count++]= o->name;
222
223 if(avcodec_opts[0]->debug || avformat_opts->debug)
224 av_log_set_level(AV_LOG_DEBUG);
225 return 0;
226 }
227
228 int opt_loglevel(const char *opt, const char *arg)
229 {
230 const struct { const char *name; int level; } log_levels[] = {
231 { "quiet" , AV_LOG_QUIET },
232 { "panic" , AV_LOG_PANIC },
233 { "fatal" , AV_LOG_FATAL },
234 { "error" , AV_LOG_ERROR },
235 { "warning", AV_LOG_WARNING },
236 { "info" , AV_LOG_INFO },
237 { "verbose", AV_LOG_VERBOSE },
238 { "debug" , AV_LOG_DEBUG },
239 };
240 char *tail;
241 int level;
242 int i;
243
244 for (i = 0; i < FF_ARRAY_ELEMS(log_levels); i++) {
245 if (!strcmp(log_levels[i].name, arg)) {
246 av_log_set_level(log_levels[i].level);
247 return 0;
248 }
249 }
250
251 level = strtol(arg, &tail, 10);
252 if (*tail) {
253 fprintf(stderr, "Invalid loglevel \"%s\". "
254 "Possible levels are numbers or:\n", arg);
255 for (i = 0; i < FF_ARRAY_ELEMS(log_levels); i++)
256 fprintf(stderr, "\"%s\"\n", log_levels[i].name);
257 exit(1);
258 }
259 av_log_set_level(level);
260 return 0;
261 }
262
263 int opt_timelimit(const char *opt, const char *arg)
264 {
265 #if HAVE_SYS_RESOURCE_H
266 int lim = parse_number_or_die(opt, arg, OPT_INT64, 0, INT_MAX);
267 struct rlimit rl = { lim, lim + 1 };
268 if (setrlimit(RLIMIT_CPU, &rl))
269 perror("setrlimit");
270 #else
271 fprintf(stderr, "Warning: -%s not implemented on this OS\n", opt);
272 #endif
273 return 0;
274 }
275
276 void set_context_opts(void *ctx, void *opts_ctx, int flags)
277 {
278 int i;
279 for(i=0; i<opt_name_count; i++){
280 char buf[256];
281 const AVOption *opt;
282 const char *str= av_get_string(opts_ctx, opt_names[i], &opt, buf, sizeof(buf));
283 /* if an option with name opt_names[i] is present in opts_ctx then str is non-NULL */
284 if(str && ((opt->flags & flags) == flags))
285 av_set_string3(ctx, opt_names[i], str, 1, NULL);
286 }
287 }
288
289 void print_error(const char *filename, int err)
290 {
291 switch(err) {
292 case AVERROR_NUMEXPECTED:
293 fprintf(stderr, "%s: Incorrect image filename syntax.\n"
294 "Use '%%d' to specify the image number:\n"
295 " for img1.jpg, img2.jpg, ..., use 'img%%d.jpg';\n"
296 " for img001.jpg, img002.jpg, ..., use 'img%%03d.jpg'.\n",
297 filename);
298 break;
299 case AVERROR_INVALIDDATA:
300 fprintf(stderr, "%s: Error while parsing header\n", filename);
301 break;
302 case AVERROR_NOFMT:
303 fprintf(stderr, "%s: Unknown format\n", filename);
304 break;
305 case AVERROR(EIO):
306 fprintf(stderr, "%s: I/O error occurred\n"
307 "Usually that means that input file is truncated and/or corrupted.\n",
308 filename);
309 break;
310 case AVERROR(ENOMEM):
311 fprintf(stderr, "%s: memory allocation error occurred\n", filename);
312 break;
313 case AVERROR(ENOENT):
314 fprintf(stderr, "%s: no such file or directory\n", filename);
315 break;
316 #if CONFIG_NETWORK
317 case AVERROR(FF_NETERROR(EPROTONOSUPPORT)):
318 fprintf(stderr, "%s: Unsupported network protocol\n", filename);
319 break;
320 #endif
321 default:
322 fprintf(stderr, "%s: Error while opening file\n", filename);
323 break;
324 }
325 }
326
327 #define PRINT_LIB_VERSION(outstream,libname,LIBNAME,indent) \
328 if (CONFIG_##LIBNAME) { \
329 version= libname##_version(); \
330 fprintf(outstream, "%slib%-10s %2d.%2d.%2d / %2d.%2d.%2d\n", \
331 indent? " " : "", #libname, \
332 LIB##LIBNAME##_VERSION_MAJOR, \
333 LIB##LIBNAME##_VERSION_MINOR, \
334 LIB##LIBNAME##_VERSION_MICRO, \
335 version >> 16, version >> 8 & 0xff, version & 0xff); \
336 }
337
338 static void print_all_lib_versions(FILE* outstream, int indent)
339 {
340 unsigned int version;
341 PRINT_LIB_VERSION(outstream, avutil, AVUTIL, indent);
342 PRINT_LIB_VERSION(outstream, avcodec, AVCODEC, indent);
343 PRINT_LIB_VERSION(outstream, avformat, AVFORMAT, indent);
344 PRINT_LIB_VERSION(outstream, avdevice, AVDEVICE, indent);
345 PRINT_LIB_VERSION(outstream, avfilter, AVFILTER, indent);
346 PRINT_LIB_VERSION(outstream, swscale, SWSCALE, indent);
347 PRINT_LIB_VERSION(outstream, postproc, POSTPROC, indent);
348 }
349
350 static void maybe_print_config(const char *lib, const char *cfg)
351 {
352 static int warned_cfg;
353
354 if (strcmp(FFMPEG_CONFIGURATION, cfg)) {
355 if (!warned_cfg) {
356 fprintf(stderr, " WARNING: library configuration mismatch\n");
357 warned_cfg = 1;
358 }
359 fprintf(stderr, " %-11s configuration: %s\n", lib, cfg);
360 }
361 }
362
363 #define PRINT_LIB_CONFIG(lib, tag, cfg) do { \
364 if (CONFIG_##lib) \
365 maybe_print_config(tag, cfg); \
366 } while (0)
367
368 void show_banner(void)
369 {
370 fprintf(stderr, "%s version " FFMPEG_VERSION ", Copyright (c) %d-%d Fabrice Bellard, et al.\n",
371 program_name, program_birth_year, this_year);
372 fprintf(stderr, " built on %s %s with %s %s\n",
373 __DATE__, __TIME__, CC_TYPE, CC_VERSION);
374 fprintf(stderr, " configuration: " FFMPEG_CONFIGURATION "\n");
375 PRINT_LIB_CONFIG(AVUTIL, "libavutil", avutil_configuration());
376 PRINT_LIB_CONFIG(AVCODEC, "libavcodec", avcodec_configuration());
377 PRINT_LIB_CONFIG(AVFORMAT, "libavformat", avformat_configuration());
378 PRINT_LIB_CONFIG(AVDEVICE, "libavdevice", avdevice_configuration());
379 PRINT_LIB_CONFIG(AVFILTER, "libavfilter", avfilter_configuration());
380 PRINT_LIB_CONFIG(SWSCALE, "libswscale", swscale_configuration());
381 PRINT_LIB_CONFIG(POSTPROC, "libpostproc", postproc_configuration());
382 print_all_lib_versions(stderr, 1);
383 }
384
385 void show_version(void) {
386 printf("%s " FFMPEG_VERSION "\n", program_name);
387 print_all_lib_versions(stdout, 0);
388 }
389
390 void show_license(void)
391 {
392 printf(
393 #if CONFIG_NONFREE
394 "This version of %s has nonfree parts compiled in.\n"
395 "Therefore it is not legally redistributable.\n",
396 program_name
397 #elif CONFIG_GPLV3
398 "%s is free software; you can redistribute it and/or modify\n"
399 "it under the terms of the GNU General Public License as published by\n"
400 "the Free Software Foundation; either version 3 of the License, or\n"
401 "(at your option) any later version.\n"
402 "\n"
403 "%s is distributed in the hope that it will be useful,\n"
404 "but WITHOUT ANY WARRANTY; without even the implied warranty of\n"
405 "MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the\n"
406 "GNU General Public License for more details.\n"
407 "\n"
408 "You should have received a copy of the GNU General Public License\n"
409 "along with %s. If not, see <http://www.gnu.org/licenses/>.\n",
410 program_name, program_name, program_name
411 #elif CONFIG_GPL
412 "%s is free software; you can redistribute it and/or modify\n"
413 "it under the terms of the GNU General Public License as published by\n"
414 "the Free Software Foundation; either version 2 of the License, or\n"
415 "(at your option) any later version.\n"
416 "\n"
417 "%s is distributed in the hope that it will be useful,\n"
418 "but WITHOUT ANY WARRANTY; without even the implied warranty of\n"
419 "MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the\n"
420 "GNU General Public License for more details.\n"
421 "\n"
422 "You should have received a copy of the GNU General Public License\n"
423 "along with %s; if not, write to the Free Software\n"
424 "Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA\n",
425 program_name, program_name, program_name
426 #elif CONFIG_LGPLV3
427 "%s is free software; you can redistribute it and/or modify\n"
428 "it under the terms of the GNU Lesser General Public License as published by\n"
429 "the Free Software Foundation; either version 3 of the License, or\n"
430 "(at your option) any later version.\n"
431 "\n"
432 "%s is distributed in the hope that it will be useful,\n"
433 "but WITHOUT ANY WARRANTY; without even the implied warranty of\n"
434 "MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the\n"
435 "GNU Lesser General Public License for more details.\n"
436 "\n"
437 "You should have received a copy of the GNU Lesser General Public License\n"
438 "along with %s. If not, see <http://www.gnu.org/licenses/>.\n",
439 program_name, program_name, program_name
440 #else
441 "%s is free software; you can redistribute it and/or\n"
442 "modify it under the terms of the GNU Lesser General Public\n"
443 "License as published by the Free Software Foundation; either\n"
444 "version 2.1 of the License, or (at your option) any later version.\n"
445 "\n"
446 "%s is distributed in the hope that it will be useful,\n"
447 "but WITHOUT ANY WARRANTY; without even the implied warranty of\n"
448 "MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU\n"
449 "Lesser General Public License for more details.\n"
450 "\n"
451 "You should have received a copy of the GNU Lesser General Public\n"
452 "License along with %s; if not, write to the Free Software\n"
453 "Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA\n",
454 program_name, program_name, program_name
455 #endif
456 );
457 }
458
459 void list_fmts(void (*get_fmt_string)(char *buf, int buf_size, int fmt), int nb_fmts)
460 {
461 int i;
462 char fmt_str[128];
463 for (i=-1; i < nb_fmts; i++) {
464 get_fmt_string (fmt_str, sizeof(fmt_str), i);
465 fprintf(stdout, "%s\n", fmt_str);
466 }
467 }
468
469 void show_formats(void)
470 {
471 AVInputFormat *ifmt=NULL;
472 AVOutputFormat *ofmt=NULL;
473 const char *last_name;
474
475 printf(
476 "File formats:\n"
477 " D. = Demuxing supported\n"
478 " .E = Muxing supported\n"
479 " --\n");
480 last_name= "000";
481 for(;;){
482 int decode=0;
483 int encode=0;
484 const char *name=NULL;
485 const char *long_name=NULL;
486
487 while((ofmt= av_oformat_next(ofmt))) {
488 if((name == NULL || strcmp(ofmt->name, name)<0) &&
489 strcmp(ofmt->name, last_name)>0){
490 name= ofmt->name;
491 long_name= ofmt->long_name;
492 encode=1;
493 }
494 }
495 while((ifmt= av_iformat_next(ifmt))) {
496 if((name == NULL || strcmp(ifmt->name, name)<0) &&
497 strcmp(ifmt->name, last_name)>0){
498 name= ifmt->name;
499 long_name= ifmt->long_name;
500 encode=0;
501 }
502 if(name && strcmp(ifmt->name, name)==0)
503 decode=1;
504 }
505 if(name==NULL)
506 break;
507 last_name= name;
508
509 printf(
510 " %s%s %-15s %s\n",
511 decode ? "D":" ",
512 encode ? "E":" ",
513 name,
514 long_name ? long_name:" ");
515 }
516 }
517
518 void show_codecs(void)
519 {
520 AVCodec *p=NULL, *p2;
521 const char *last_name;
522 printf(
523 "Codecs:\n"
524 " D..... = Decoding supported\n"
525 " .E.... = Encoding supported\n"
526 " ..V... = Video codec\n"
527 " ..A... = Audio codec\n"
528 " ..S... = Subtitle codec\n"
529 " ...S.. = Supports draw_horiz_band\n"
530 " ....D. = Supports direct rendering method 1\n"
531 " .....T = Supports weird frame truncation\n"
532 " ------\n");
533 last_name= "000";
534 for(;;){
535 int decode=0;
536 int encode=0;
537 int cap=0;
538 const char *type_str;
539
540 p2=NULL;
541 while((p= av_codec_next(p))) {
542 if((p2==NULL || strcmp(p->name, p2->name)<0) &&
543 strcmp(p->name, last_name)>0){
544 p2= p;
545 decode= encode= cap=0;
546 }
547 if(p2 && strcmp(p->name, p2->name)==0){
548 if(p->decode) decode=1;
549 if(p->encode) encode=1;
550 cap |= p->capabilities;
551 }
552 }
553 if(p2==NULL)
554 break;
555 last_name= p2->name;
556
557 switch(p2->type) {
558 case CODEC_TYPE_VIDEO:
559 type_str = "V";
560 break;
561 case CODEC_TYPE_AUDIO:
562 type_str = "A";
563 break;
564 case CODEC_TYPE_SUBTITLE:
565 type_str = "S";
566 break;
567 default:
568 type_str = "?";
569 break;
570 }
571 printf(
572 " %s%s%s%s%s%s %-15s %s",
573 decode ? "D": (/*p2->decoder ? "d":*/" "),
574 encode ? "E":" ",
575 type_str,
576 cap & CODEC_CAP_DRAW_HORIZ_BAND ? "S":" ",
577 cap & CODEC_CAP_DR1 ? "D":" ",
578 cap & CODEC_CAP_TRUNCATED ? "T":" ",
579 p2->name,
580 p2->long_name ? p2->long_name : "");
581 /* if(p2->decoder && decode==0)
582 printf(" use %s for decoding", p2->decoder->name);*/
583 printf("\n");
584 }
585 printf("\n");
586 printf(
587 "Note, the names of encoders and decoders do not always match, so there are\n"
588 "several cases where the above table shows encoder only or decoder only entries\n"
589 "even though both encoding and decoding are supported. For example, the h263\n"
590 "decoder corresponds to the h263 and h263p encoders, for file formats it is even\n"
591 "worse.\n");
592 }
593
594 void show_bsfs(void)
595 {
596 AVBitStreamFilter *bsf=NULL;
597
598 printf("Bitstream filters:\n");
599 while((bsf = av_bitstream_filter_next(bsf)))
600 printf("%s\n", bsf->name);
601 printf("\n");
602 }
603
604 void show_protocols(void)
605 {
606 URLProtocol *up=NULL;
607
608 printf("Supported file protocols:\n");
609 while((up = av_protocol_next(up)))
610 printf("%s\n", up->name);
611 printf("\n");
612
613 printf("Frame size, frame rate abbreviations:\n ntsc pal qntsc qpal sntsc spal film ntsc-film sqcif qcif cif 4cif\n");
614 }
615
616 void show_filters(void)
617 {
618 AVFilter av_unused(**filter) = NULL;
619
620 printf("Filters:\n");
621 #if CONFIG_AVFILTER
622 while ((filter = av_filter_next(filter)) && *filter)
623 printf("%-16s %s\n", (*filter)->name, (*filter)->description);
624 #endif
625 }
626
627 void show_pix_fmts(void)
628 {
629 list_fmts(avcodec_pix_fmt_string, PIX_FMT_NB);
630 }
631
632 int read_yesno(void)
633 {
634 int c = getchar();
635 int yesno = (toupper(c) == 'Y');
636
637 while (c != '\n' && c != EOF)
638 c = getchar();
639
640 return yesno;
641 }