8 /* ----------------------------------------------------------------------
9 * String handling routines.
12 char *dupstr(const char *s)
15 char *p = smalloc(len + 1);
20 /* Allocate the concatenation of N strings. Terminate arg list with NULL. */
21 char *dupcat(const char *s1, ...)
30 sn = va_arg(ap, char *);
43 sn = va_arg(ap, char *);
55 * Do an sprintf(), but into a custom-allocated buffer.
57 * Irritatingly, we don't seem to be able to do this portably using
58 * vsnprintf(), because there appear to be issues with re-using the
59 * same va_list for two calls, and the excellent C99 va_copy is not
60 * yet widespread. Bah. Instead I'm going to do a horrid, horrid
61 * hack, in which I trawl the format string myself, work out the
62 * maximum length of each format component, and resize the buffer
65 char *dupprintf(const char *fmt, ...)
70 ret = dupvprintf(fmt, ap);
74 char *dupvprintf(const char *fmt, va_list ap)
84 #define vsnprintf _vsnprintf
86 len = vsnprintf(buf, size, fmt, ap);
87 if (len >= 0 && len < size) {
88 /* This is the C99-specified criterion for snprintf to have
89 * been completely successful. */
92 /* This is the C99 error condition: the returned length is
93 * the required buffer size not counting the NUL. */
96 /* This is the pre-C99 glibc error condition: <0 means the
97 * buffer wasn't big enough, so we enlarge it a bit and hope. */
100 buf = srealloc(buf, size);
104 /* ----------------------------------------------------------------------
105 * Base64 encoding routine. This is required in public-key writing
106 * but also in HTTP proxy handling, so it's centralised here.
109 void base64_encode_atom(unsigned char *data, int n, char *out)
111 static const char base64_chars[] =
112 "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
116 word = data[0] << 16;
118 word |= data[1] << 8;
121 out[0] = base64_chars[(word >> 18) & 0x3F];
122 out[1] = base64_chars[(word >> 12) & 0x3F];
124 out[2] = base64_chars[(word >> 6) & 0x3F];
128 out[3] = base64_chars[word & 0x3F];
133 /* ----------------------------------------------------------------------
134 * Generic routines to deal with send buffers: a linked list of
135 * smallish blocks, with the operations
137 * - add an arbitrary amount of data to the end of the list
138 * - remove the first N bytes from the list
139 * - return a (pointer,length) pair giving some initial data in
140 * the list, suitable for passing to a send or write system
142 * - retrieve a larger amount of initial data from the list
143 * - return the current size of the buffer chain in bytes
146 #define BUFFER_GRANULE 512
148 struct bufchain_granule {
149 struct bufchain_granule *next;
151 char buf[BUFFER_GRANULE];
154 void bufchain_init(bufchain *ch)
156 ch->head = ch->tail = NULL;
160 void bufchain_clear(bufchain *ch)
162 struct bufchain_granule *b;
165 ch->head = ch->head->next;
172 int bufchain_size(bufchain *ch)
174 return ch->buffersize;
177 void bufchain_add(bufchain *ch, const void *data, int len)
179 const char *buf = (const char *)data;
181 ch->buffersize += len;
183 if (ch->tail && ch->tail->buflen < BUFFER_GRANULE) {
184 int copylen = min(len, BUFFER_GRANULE - ch->tail->buflen);
185 memcpy(ch->tail->buf + ch->tail->buflen, buf, copylen);
188 ch->tail->buflen += copylen;
191 int grainlen = min(len, BUFFER_GRANULE);
192 struct bufchain_granule *newbuf;
193 newbuf = smalloc(sizeof(struct bufchain_granule));
195 newbuf->buflen = grainlen;
196 memcpy(newbuf->buf, buf, grainlen);
200 ch->tail->next = newbuf;
202 ch->head = ch->tail = newbuf;
208 void bufchain_consume(bufchain *ch, int len)
210 struct bufchain_granule *tmp;
212 assert(ch->buffersize >= len);
215 assert(ch->head != NULL);
216 if (remlen >= ch->head->buflen - ch->head->bufpos) {
217 remlen = ch->head->buflen - ch->head->bufpos;
219 ch->head = tmp->next;
224 ch->head->bufpos += remlen;
225 ch->buffersize -= remlen;
230 void bufchain_prefix(bufchain *ch, void **data, int *len)
232 *len = ch->head->buflen - ch->head->bufpos;
233 *data = ch->head->buf + ch->head->bufpos;
236 void bufchain_fetch(bufchain *ch, void *data, int len)
238 struct bufchain_granule *tmp;
239 char *data_c = (char *)data;
243 assert(ch->buffersize >= len);
248 if (remlen >= tmp->buflen - tmp->bufpos)
249 remlen = tmp->buflen - tmp->bufpos;
250 memcpy(data_c, tmp->buf + tmp->bufpos, remlen);
258 /* ----------------------------------------------------------------------
259 * My own versions of malloc, realloc and free. Because I want
260 * malloc and realloc to bomb out and exit the program if they run
261 * out of memory, realloc to reliably call malloc if passed a NULL
262 * pointer, and free to reliably do nothing if passed a NULL
263 * pointer. We can also put trace printouts in, if we need to; and
264 * we can also replace the allocator with an ElectricFence-like
269 void *minefield_c_malloc(size_t size);
270 void minefield_c_free(void *p);
271 void *minefield_c_realloc(void *p, size_t size);
275 static FILE *fp = NULL;
277 static char *mlog_file = NULL;
278 static int mlog_line = 0;
280 void mlog(char *file, int line)
285 fp = fopen("putty_mem.log", "w");
286 setvbuf(fp, NULL, _IONBF, BUFSIZ);
289 fprintf(fp, "%s:%d: ", file, line);
293 void *safemalloc(size_t size)
297 p = minefield_c_malloc(size);
304 sprintf(str, "Out of memory! (%s:%d, size=%d)",
305 mlog_file, mlog_line, size);
306 fprintf(fp, "*** %s\n", str);
309 strcpy(str, "Out of memory!");
315 fprintf(fp, "malloc(%d) returns %p\n", size, p);
320 void *saferealloc(void *ptr, size_t size)
325 p = minefield_c_malloc(size);
331 p = minefield_c_realloc(ptr, size);
333 p = realloc(ptr, size);
339 sprintf(str, "Out of memory! (%s:%d, size=%d)",
340 mlog_file, mlog_line, size);
341 fprintf(fp, "*** %s\n", str);
344 strcpy(str, "Out of memory!");
350 fprintf(fp, "realloc(%p,%d) returns %p\n", ptr, size, p);
355 void safefree(void *ptr)
360 fprintf(fp, "free(%p)\n", ptr);
363 minefield_c_free(ptr);
370 fprintf(fp, "freeing null pointer - no action taken\n");
374 /* ----------------------------------------------------------------------
375 * Debugging routines.
379 extern void dputs(char *); /* defined in per-platform *misc.c */
381 void debug_printf(char *fmt, ...)
387 buf = dupvprintf(fmt, ap);
394 void debug_memdump(void *buf, int len, int L)
397 unsigned char *p = buf;
401 debug_printf("\t%d (0x%x) bytes:\n", len, len);
402 delta = 15 & (int) p;
406 for (; 0 < len; p += 16, len -= 16) {
409 debug_printf("%p: ", p);
410 strcpy(foo, "................"); /* sixteen dots */
411 for (i = 0; i < 16 && i < len; ++i) {
412 if (&p[i] < (unsigned char *) buf) {
413 dputs(" "); /* 3 spaces */
416 debug_printf("%c%02.2x",
417 &p[i] != (unsigned char *) buf
418 && i % 4 ? '.' : ' ', p[i]
420 if (p[i] >= ' ' && p[i] <= '~')
421 foo[i] = (char) p[i];
425 debug_printf("%*s%s\n", (16 - i) * 3 + 2, "", foo);
429 #endif /* def DEBUG */