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comparison mupdf-source/thirdparty/curl/lib/memdebug.c @ 2:b50eed0cc0ef upstream

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ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4. The directory name has changed: no version number in the expanded directory now.
author Franz Glasner <fzglas.hg@dom66.de>
date Mon, 15 Sep 2025 11:43:07 +0200
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1:1d09e1dec1d9 2:b50eed0cc0ef
1 /***************************************************************************
2 * _ _ ____ _
3 * Project ___| | | | _ \| |
4 * / __| | | | |_) | |
5 * | (__| |_| | _ <| |___
6 * \___|\___/|_| \_\_____|
7 *
8 * Copyright (C) 1998 - 2019, Daniel Stenberg, <daniel@haxx.se>, et al.
9 *
10 * This software is licensed as described in the file COPYING, which
11 * you should have received as part of this distribution. The terms
12 * are also available at https://curl.haxx.se/docs/copyright.html.
13 *
14 * You may opt to use, copy, modify, merge, publish, distribute and/or sell
15 * copies of the Software, and permit persons to whom the Software is
16 * furnished to do so, under the terms of the COPYING file.
17 *
18 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
19 * KIND, either express or implied.
20 *
21 ***************************************************************************/
22
23 #include "curl_setup.h"
24
25 #ifdef CURLDEBUG
26
27 #include <curl/curl.h>
28
29 #include "urldata.h"
30
31 #define MEMDEBUG_NODEFINES /* don't redefine the standard functions */
32
33 /* The last 3 #include files should be in this order */
34 #include "curl_printf.h"
35 #include "curl_memory.h"
36 #include "memdebug.h"
37
38 /*
39 * Until 2011-08-17 libcurl's Memory Tracking feature also performed
40 * automatic malloc and free filling operations using 0xA5 and 0x13
41 * values. Our own preinitialization of dynamically allocated memory
42 * might be useful when not using third party memory debuggers, but
43 * on the other hand this would fool memory debuggers into thinking
44 * that all dynamically allocated memory is properly initialized.
45 *
46 * As a default setting, libcurl's Memory Tracking feature no longer
47 * performs preinitialization of dynamically allocated memory on its
48 * own. If you know what you are doing, and really want to retain old
49 * behavior, you can achieve this compiling with preprocessor symbols
50 * CURL_MT_MALLOC_FILL and CURL_MT_FREE_FILL defined with appropriate
51 * values.
52 */
53
54 #ifdef CURL_MT_MALLOC_FILL
55 # if (CURL_MT_MALLOC_FILL < 0) || (CURL_MT_MALLOC_FILL > 0xff)
56 # error "invalid CURL_MT_MALLOC_FILL or out of range"
57 # endif
58 #endif
59
60 #ifdef CURL_MT_FREE_FILL
61 # if (CURL_MT_FREE_FILL < 0) || (CURL_MT_FREE_FILL > 0xff)
62 # error "invalid CURL_MT_FREE_FILL or out of range"
63 # endif
64 #endif
65
66 #if defined(CURL_MT_MALLOC_FILL) && defined(CURL_MT_FREE_FILL)
67 # if (CURL_MT_MALLOC_FILL == CURL_MT_FREE_FILL)
68 # error "CURL_MT_MALLOC_FILL same as CURL_MT_FREE_FILL"
69 # endif
70 #endif
71
72 #ifdef CURL_MT_MALLOC_FILL
73 # define mt_malloc_fill(buf,len) memset((buf), CURL_MT_MALLOC_FILL, (len))
74 #else
75 # define mt_malloc_fill(buf,len) Curl_nop_stmt
76 #endif
77
78 #ifdef CURL_MT_FREE_FILL
79 # define mt_free_fill(buf,len) memset((buf), CURL_MT_FREE_FILL, (len))
80 #else
81 # define mt_free_fill(buf,len) Curl_nop_stmt
82 #endif
83
84 struct memdebug {
85 size_t size;
86 union {
87 curl_off_t o;
88 double d;
89 void *p;
90 } mem[1];
91 /* I'm hoping this is the thing with the strictest alignment
92 * requirements. That also means we waste some space :-( */
93 };
94
95 /*
96 * Note that these debug functions are very simple and they are meant to
97 * remain so. For advanced analysis, record a log file and write perl scripts
98 * to analyze them!
99 *
100 * Don't use these with multithreaded test programs!
101 */
102
103 FILE *curl_dbg_logfile = NULL;
104 static bool memlimit = FALSE; /* enable memory limit */
105 static long memsize = 0; /* set number of mallocs allowed */
106
107 /* this sets the log file name */
108 void curl_dbg_memdebug(const char *logname)
109 {
110 if(!curl_dbg_logfile) {
111 if(logname && *logname)
112 curl_dbg_logfile = fopen(logname, FOPEN_WRITETEXT);
113 else
114 curl_dbg_logfile = stderr;
115 #ifdef MEMDEBUG_LOG_SYNC
116 /* Flush the log file after every line so the log isn't lost in a crash */
117 if(curl_dbg_logfile)
118 setbuf(curl_dbg_logfile, (char *)NULL);
119 #endif
120 }
121 }
122
123 /* This function sets the number of malloc() calls that should return
124 successfully! */
125 void curl_dbg_memlimit(long limit)
126 {
127 if(!memlimit) {
128 memlimit = TRUE;
129 memsize = limit;
130 }
131 }
132
133 /* returns TRUE if this isn't allowed! */
134 static bool countcheck(const char *func, int line, const char *source)
135 {
136 /* if source is NULL, then the call is made internally and this check
137 should not be made */
138 if(memlimit && source) {
139 if(!memsize) {
140 if(source) {
141 /* log to file */
142 curl_dbg_log("LIMIT %s:%d %s reached memlimit\n",
143 source, line, func);
144 /* log to stderr also */
145 fprintf(stderr, "LIMIT %s:%d %s reached memlimit\n",
146 source, line, func);
147 fflush(curl_dbg_logfile); /* because it might crash now */
148 }
149 errno = ENOMEM;
150 return TRUE; /* RETURN ERROR! */
151 }
152 else
153 memsize--; /* countdown */
154
155
156 }
157
158 return FALSE; /* allow this */
159 }
160
161 void *curl_dbg_malloc(size_t wantedsize, int line, const char *source)
162 {
163 struct memdebug *mem;
164 size_t size;
165
166 DEBUGASSERT(wantedsize != 0);
167
168 if(countcheck("malloc", line, source))
169 return NULL;
170
171 /* alloc at least 64 bytes */
172 size = sizeof(struct memdebug) + wantedsize;
173
174 mem = (Curl_cmalloc)(size);
175 if(mem) {
176 /* fill memory with junk */
177 mt_malloc_fill(mem->mem, wantedsize);
178 mem->size = wantedsize;
179 }
180
181 if(source)
182 curl_dbg_log("MEM %s:%d malloc(%zu) = %p\n",
183 source, line, wantedsize,
184 mem ? (void *)mem->mem : (void *)0);
185
186 return (mem ? mem->mem : NULL);
187 }
188
189 void *curl_dbg_calloc(size_t wanted_elements, size_t wanted_size,
190 int line, const char *source)
191 {
192 struct memdebug *mem;
193 size_t size, user_size;
194
195 DEBUGASSERT(wanted_elements != 0);
196 DEBUGASSERT(wanted_size != 0);
197
198 if(countcheck("calloc", line, source))
199 return NULL;
200
201 /* alloc at least 64 bytes */
202 user_size = wanted_size * wanted_elements;
203 size = sizeof(struct memdebug) + user_size;
204
205 mem = (Curl_ccalloc)(1, size);
206 if(mem)
207 mem->size = user_size;
208
209 if(source)
210 curl_dbg_log("MEM %s:%d calloc(%zu,%zu) = %p\n",
211 source, line, wanted_elements, wanted_size,
212 mem ? (void *)mem->mem : (void *)0);
213
214 return (mem ? mem->mem : NULL);
215 }
216
217 char *curl_dbg_strdup(const char *str, int line, const char *source)
218 {
219 char *mem;
220 size_t len;
221
222 DEBUGASSERT(str != NULL);
223
224 if(countcheck("strdup", line, source))
225 return NULL;
226
227 len = strlen(str) + 1;
228
229 mem = curl_dbg_malloc(len, 0, NULL); /* NULL prevents logging */
230 if(mem)
231 memcpy(mem, str, len);
232
233 if(source)
234 curl_dbg_log("MEM %s:%d strdup(%p) (%zu) = %p\n",
235 source, line, (const void *)str, len, (const void *)mem);
236
237 return mem;
238 }
239
240 #if defined(WIN32) && defined(UNICODE)
241 wchar_t *curl_dbg_wcsdup(const wchar_t *str, int line, const char *source)
242 {
243 wchar_t *mem;
244 size_t wsiz, bsiz;
245
246 DEBUGASSERT(str != NULL);
247
248 if(countcheck("wcsdup", line, source))
249 return NULL;
250
251 wsiz = wcslen(str) + 1;
252 bsiz = wsiz * sizeof(wchar_t);
253
254 mem = curl_dbg_malloc(bsiz, 0, NULL); /* NULL prevents logging */
255 if(mem)
256 memcpy(mem, str, bsiz);
257
258 if(source)
259 curl_dbg_log("MEM %s:%d wcsdup(%p) (%zu) = %p\n",
260 source, line, (void *)str, bsiz, (void *)mem);
261
262 return mem;
263 }
264 #endif
265
266 /* We provide a realloc() that accepts a NULL as pointer, which then
267 performs a malloc(). In order to work with ares. */
268 void *curl_dbg_realloc(void *ptr, size_t wantedsize,
269 int line, const char *source)
270 {
271 struct memdebug *mem = NULL;
272
273 size_t size = sizeof(struct memdebug) + wantedsize;
274
275 DEBUGASSERT(wantedsize != 0);
276
277 if(countcheck("realloc", line, source))
278 return NULL;
279
280 #ifdef __INTEL_COMPILER
281 # pragma warning(push)
282 # pragma warning(disable:1684)
283 /* 1684: conversion from pointer to same-sized integral type */
284 #endif
285
286 if(ptr)
287 mem = (void *)((char *)ptr - offsetof(struct memdebug, mem));
288
289 #ifdef __INTEL_COMPILER
290 # pragma warning(pop)
291 #endif
292
293 mem = (Curl_crealloc)(mem, size);
294 if(source)
295 curl_dbg_log("MEM %s:%d realloc(%p, %zu) = %p\n",
296 source, line, (void *)ptr, wantedsize,
297 mem ? (void *)mem->mem : (void *)0);
298
299 if(mem) {
300 mem->size = wantedsize;
301 return mem->mem;
302 }
303
304 return NULL;
305 }
306
307 void curl_dbg_free(void *ptr, int line, const char *source)
308 {
309 if(ptr) {
310 struct memdebug *mem;
311
312 #ifdef __INTEL_COMPILER
313 # pragma warning(push)
314 # pragma warning(disable:1684)
315 /* 1684: conversion from pointer to same-sized integral type */
316 #endif
317
318 mem = (void *)((char *)ptr - offsetof(struct memdebug, mem));
319
320 #ifdef __INTEL_COMPILER
321 # pragma warning(pop)
322 #endif
323
324 /* destroy */
325 mt_free_fill(mem->mem, mem->size);
326
327 /* free for real */
328 (Curl_cfree)(mem);
329 }
330
331 if(source)
332 curl_dbg_log("MEM %s:%d free(%p)\n", source, line, (void *)ptr);
333 }
334
335 curl_socket_t curl_dbg_socket(int domain, int type, int protocol,
336 int line, const char *source)
337 {
338 const char *fmt = (sizeof(curl_socket_t) == sizeof(int)) ?
339 "FD %s:%d socket() = %d\n" :
340 (sizeof(curl_socket_t) == sizeof(long)) ?
341 "FD %s:%d socket() = %ld\n" :
342 "FD %s:%d socket() = %zd\n";
343
344 curl_socket_t sockfd;
345
346 if(countcheck("socket", line, source))
347 return CURL_SOCKET_BAD;
348
349 sockfd = socket(domain, type, protocol);
350
351 if(source && (sockfd != CURL_SOCKET_BAD))
352 curl_dbg_log(fmt, source, line, sockfd);
353
354 return sockfd;
355 }
356
357 SEND_TYPE_RETV curl_dbg_send(SEND_TYPE_ARG1 sockfd,
358 SEND_QUAL_ARG2 SEND_TYPE_ARG2 buf,
359 SEND_TYPE_ARG3 len, SEND_TYPE_ARG4 flags, int line,
360 const char *source)
361 {
362 SEND_TYPE_RETV rc;
363 if(countcheck("send", line, source))
364 return -1;
365 rc = send(sockfd, buf, len, flags);
366 if(source)
367 curl_dbg_log("SEND %s:%d send(%lu) = %ld\n",
368 source, line, (unsigned long)len, (long)rc);
369 return rc;
370 }
371
372 RECV_TYPE_RETV curl_dbg_recv(RECV_TYPE_ARG1 sockfd, RECV_TYPE_ARG2 buf,
373 RECV_TYPE_ARG3 len, RECV_TYPE_ARG4 flags, int line,
374 const char *source)
375 {
376 RECV_TYPE_RETV rc;
377 if(countcheck("recv", line, source))
378 return -1;
379 rc = recv(sockfd, buf, len, flags);
380 if(source)
381 curl_dbg_log("RECV %s:%d recv(%lu) = %ld\n",
382 source, line, (unsigned long)len, (long)rc);
383 return rc;
384 }
385
386 #ifdef HAVE_SOCKETPAIR
387 int curl_dbg_socketpair(int domain, int type, int protocol,
388 curl_socket_t socket_vector[2],
389 int line, const char *source)
390 {
391 const char *fmt = (sizeof(curl_socket_t) == sizeof(int)) ?
392 "FD %s:%d socketpair() = %d %d\n" :
393 (sizeof(curl_socket_t) == sizeof(long)) ?
394 "FD %s:%d socketpair() = %ld %ld\n" :
395 "FD %s:%d socketpair() = %zd %zd\n";
396
397 int res = socketpair(domain, type, protocol, socket_vector);
398
399 if(source && (0 == res))
400 curl_dbg_log(fmt, source, line, socket_vector[0], socket_vector[1]);
401
402 return res;
403 }
404 #endif
405
406 curl_socket_t curl_dbg_accept(curl_socket_t s, void *saddr, void *saddrlen,
407 int line, const char *source)
408 {
409 const char *fmt = (sizeof(curl_socket_t) == sizeof(int)) ?
410 "FD %s:%d accept() = %d\n" :
411 (sizeof(curl_socket_t) == sizeof(long)) ?
412 "FD %s:%d accept() = %ld\n" :
413 "FD %s:%d accept() = %zd\n";
414
415 struct sockaddr *addr = (struct sockaddr *)saddr;
416 curl_socklen_t *addrlen = (curl_socklen_t *)saddrlen;
417
418 curl_socket_t sockfd = accept(s, addr, addrlen);
419
420 if(source && (sockfd != CURL_SOCKET_BAD))
421 curl_dbg_log(fmt, source, line, sockfd);
422
423 return sockfd;
424 }
425
426 /* separate function to allow libcurl to mark a "faked" close */
427 void curl_dbg_mark_sclose(curl_socket_t sockfd, int line, const char *source)
428 {
429 const char *fmt = (sizeof(curl_socket_t) == sizeof(int)) ?
430 "FD %s:%d sclose(%d)\n":
431 (sizeof(curl_socket_t) == sizeof(long)) ?
432 "FD %s:%d sclose(%ld)\n":
433 "FD %s:%d sclose(%zd)\n";
434
435 if(source)
436 curl_dbg_log(fmt, source, line, sockfd);
437 }
438
439 /* this is our own defined way to close sockets on *ALL* platforms */
440 int curl_dbg_sclose(curl_socket_t sockfd, int line, const char *source)
441 {
442 int res = sclose(sockfd);
443 curl_dbg_mark_sclose(sockfd, line, source);
444 return res;
445 }
446
447 FILE *curl_dbg_fopen(const char *file, const char *mode,
448 int line, const char *source)
449 {
450 FILE *res = fopen(file, mode);
451
452 if(source)
453 curl_dbg_log("FILE %s:%d fopen(\"%s\",\"%s\") = %p\n",
454 source, line, file, mode, (void *)res);
455
456 return res;
457 }
458
459 int curl_dbg_fclose(FILE *file, int line, const char *source)
460 {
461 int res;
462
463 DEBUGASSERT(file != NULL);
464
465 if(source)
466 curl_dbg_log("FILE %s:%d fclose(%p)\n",
467 source, line, (void *)file);
468
469 res = fclose(file);
470
471 return res;
472 }
473
474 #define LOGLINE_BUFSIZE 1024
475
476 /* this does the writing to the memory tracking log file */
477 void curl_dbg_log(const char *format, ...)
478 {
479 char *buf;
480 int nchars;
481 va_list ap;
482
483 if(!curl_dbg_logfile)
484 return;
485
486 buf = (Curl_cmalloc)(LOGLINE_BUFSIZE);
487 if(!buf)
488 return;
489
490 va_start(ap, format);
491 nchars = mvsnprintf(buf, LOGLINE_BUFSIZE, format, ap);
492 va_end(ap);
493
494 if(nchars > LOGLINE_BUFSIZE - 1)
495 nchars = LOGLINE_BUFSIZE - 1;
496
497 if(nchars > 0)
498 fwrite(buf, 1, (size_t)nchars, curl_dbg_logfile);
499
500 (Curl_cfree)(buf);
501 }
502
503 #endif /* CURLDEBUG */