Commit | Line | Data |
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460b9539 | 1 | /* |
2 | * This file is part of DisOrder | |
681cb9fb | 3 | * Copyright (C) 2004, 2007, 2008 Richard Kettlewell |
460b9539 | 4 | * |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License as published by | |
7 | * the Free Software Foundation; either version 2 of the License, or | |
8 | * (at your option) any later version. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, but | |
11 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | * General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License | |
16 | * along with this program; if not, write to the Free Software | |
17 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 | |
18 | * USA | |
19 | */ | |
20 | ||
21 | #define NO_MEMORY_ALLOCATION | |
22 | /* because byte_snprintf used from log.c */ | |
23 | ||
24 | #include <config.h> | |
25 | #include "types.h" | |
26 | ||
27 | #include <stdio.h> | |
28 | #include <stdarg.h> | |
29 | #include <string.h> | |
30 | #include <errno.h> | |
31 | #include <stdlib.h> | |
32 | #include <stddef.h> | |
33 | ||
34 | #include "printf.h" | |
35 | #include "sink.h" | |
e3426f7b | 36 | #include "vacopy.h" |
460b9539 | 37 | |
38 | enum flags { | |
39 | f_thousands = 1, | |
40 | f_left = 2, | |
41 | f_sign = 4, | |
42 | f_space = 8, | |
43 | f_hash = 16, | |
44 | f_zero = 32, | |
45 | f_width = 256, | |
46 | f_precision = 512 | |
47 | }; | |
48 | ||
49 | enum lengths { | |
50 | l_char = 1, | |
51 | l_short, | |
52 | l_long, | |
53 | l_longlong, | |
54 | l_size_t, | |
55 | l_intmax_t, | |
56 | l_ptrdiff_t, | |
57 | l_longdouble | |
58 | }; | |
59 | ||
60 | struct conversion; | |
61 | ||
62 | struct state { | |
63 | struct sink *output; | |
64 | int bytes; | |
6a6b327d | 65 | va_list ap; |
460b9539 | 66 | }; |
67 | ||
68 | struct specifier { | |
69 | int ch; | |
70 | int (*check)(const struct conversion *c); | |
71 | int (*output)(struct state *s, struct conversion *c); | |
72 | int base; | |
73 | const char *digits; | |
74 | const char *xform; | |
75 | }; | |
76 | ||
77 | struct conversion { | |
78 | unsigned flags; | |
79 | int width; | |
80 | int precision; | |
81 | int length; | |
82 | const struct specifier *specifier; | |
83 | }; | |
84 | ||
85 | static const char flags[] = "'-+ #0"; | |
86 | ||
87 | /* write @nbytes@ to the output. Return -1 on error, 0 on success. | |
88 | * Keeps track of the number of bytes written. */ | |
89 | static int do_write(struct state *s, | |
90 | const void *buffer, | |
91 | int nbytes) { | |
92 | if(s->bytes > INT_MAX - nbytes) { | |
93 | #ifdef EOVERFLOW | |
94 | errno = EOVERFLOW; | |
95 | #endif | |
96 | return -1; | |
97 | } | |
681cb9fb RK |
98 | if(s->output->write(s->output, buffer, nbytes) < 0) |
99 | return -1; | |
460b9539 | 100 | s->bytes += nbytes; |
101 | return 0; | |
102 | } | |
103 | ||
104 | /* write character @ch@ @n@ times, reasonably efficiently */ | |
105 | static int do_pad(struct state *s, int ch, unsigned n) { | |
106 | unsigned t; | |
107 | const char *padding; | |
108 | ||
109 | switch(ch) { | |
110 | case ' ': padding = " "; break; | |
111 | case '0': padding = "00000000000000000000000000000000"; break; | |
112 | default: abort(); | |
113 | } | |
114 | t = n / 32; | |
115 | n %= 32; | |
116 | while(t-- > 0) | |
681cb9fb RK |
117 | if(do_write(s, padding, 32) < 0) |
118 | return -1; | |
460b9539 | 119 | if(n > 0) |
681cb9fb RK |
120 | if(do_write(s, padding, n) < 0) |
121 | return -1; | |
460b9539 | 122 | return 0; |
123 | } | |
124 | ||
125 | /* pick up the integer at @ptr@, returning it via @intp@. Return the | |
126 | * number of characters consumed. Return 0 if there is no integer | |
127 | * there and -1 if an error occurred (e.g. too big) */ | |
128 | static int get_integer(int *intp, const char *ptr) { | |
129 | long n; | |
130 | char *e; | |
131 | ||
132 | errno = 0; | |
133 | n = strtol(ptr, &e, 10); | |
681cb9fb RK |
134 | if(errno || n > INT_MAX || n < INT_MIN || e == ptr) |
135 | return -1; | |
460b9539 | 136 | *intp = n; |
137 | return e - ptr; | |
138 | } | |
139 | ||
140 | /* consistency checks for various conversion specifications */ | |
141 | ||
142 | static int check_integer(const struct conversion *c) { | |
143 | switch(c->length) { | |
144 | case 0: | |
145 | case l_char: | |
146 | case l_short: | |
147 | case l_long: | |
148 | case l_longlong: | |
149 | case l_intmax_t: | |
150 | case l_size_t: | |
151 | case l_longdouble: | |
cb9a695c | 152 | case l_ptrdiff_t: |
460b9539 | 153 | return 0; |
154 | default: | |
155 | return -1; | |
156 | } | |
157 | } | |
158 | ||
159 | static int check_string(const struct conversion *c) { | |
160 | switch(c->length) { | |
161 | case 0: | |
162 | /* XXX don't support %ls, %lc */ | |
163 | return 0; | |
164 | default: | |
165 | return -1; | |
166 | } | |
167 | } | |
168 | ||
169 | static int check_pointer(const struct conversion *c) { | |
681cb9fb RK |
170 | if(c->length) |
171 | return -1; | |
460b9539 | 172 | return 0; |
173 | } | |
174 | ||
175 | static int check_percent(const struct conversion *c) { | |
681cb9fb RK |
176 | if(c->flags || c->width || c->precision || c->length) |
177 | return -1; | |
460b9539 | 178 | return 0; |
179 | } | |
180 | ||
181 | /* output functions for various conversion specifications */ | |
182 | ||
183 | static int output_percent(struct state *s, | |
184 | struct conversion attribute((unused)) *c) { | |
185 | return do_write(s, "%", 1); | |
186 | } | |
187 | ||
188 | static int output_integer(struct state *s, struct conversion *c) { | |
189 | uintmax_t u; | |
190 | intmax_t l; | |
191 | char sign; | |
192 | int base, dp, iszero, ndigits, prec, xform, sign_bytes, pad; | |
193 | char digits[CHAR_BIT * sizeof (uintmax_t)]; /* overestimate */ | |
194 | ||
195 | switch(c->specifier->ch) { | |
196 | default: | |
197 | if(c->specifier->base < 0) { | |
198 | switch(c->length) { | |
6a6b327d RK |
199 | case 0: l = va_arg(s->ap, int); break; |
200 | case l_char: l = (signed char)va_arg(s->ap, int); break; | |
201 | case l_short: l = (short)va_arg(s->ap, int); break; | |
202 | case l_long: l = va_arg(s->ap, long); break; | |
203 | case l_longlong: l = va_arg(s->ap, long_long); break; | |
204 | case l_intmax_t: l = va_arg(s->ap, intmax_t); break; | |
205 | case l_size_t: l = va_arg(s->ap, ssize_t); break; | |
206 | case l_ptrdiff_t: l = va_arg(s->ap, ptrdiff_t); break; | |
460b9539 | 207 | default: abort(); |
208 | } | |
209 | base = -c->specifier->base; | |
210 | if(l < 0) { | |
211 | u = -l; | |
212 | sign = '-'; | |
213 | } else { | |
214 | u = l; | |
215 | sign = 0; | |
216 | } | |
217 | } else { | |
218 | switch(c->length) { | |
6a6b327d RK |
219 | case 0: u = va_arg(s->ap, unsigned int); break; |
220 | case l_char: u = (unsigned char)va_arg(s->ap, unsigned int); break; | |
221 | case l_short: u = (unsigned short)va_arg(s->ap, unsigned int); break; | |
222 | case l_long: u = va_arg(s->ap, unsigned long); break; | |
223 | case l_longlong: u = va_arg(s->ap, u_long_long); break; | |
224 | case l_intmax_t: u = va_arg(s->ap, uintmax_t); break; | |
225 | case l_size_t: u = va_arg(s->ap, size_t); break; | |
226 | case l_ptrdiff_t: u = va_arg(s->ap, ptrdiff_t); break; | |
460b9539 | 227 | default: abort(); |
228 | } | |
229 | base = c->specifier->base; | |
230 | sign = 0; | |
231 | } | |
232 | break; | |
233 | case 'p': | |
6a6b327d | 234 | u = (uintptr_t)va_arg(s->ap, void *); |
460b9539 | 235 | c->flags |= f_hash; |
236 | base = c->specifier->base; | |
237 | sign = 0; | |
238 | break; | |
239 | } | |
240 | /* default precision */ | |
241 | if(!(c->flags & f_precision)) | |
242 | c->precision = 1; | |
243 | /* enforce sign */ | |
681cb9fb RK |
244 | if((c->flags & f_sign) && !sign) |
245 | sign = '+'; | |
460b9539 | 246 | /* compute the digits */ |
247 | iszero = (u == 0); | |
248 | dp = sizeof digits; | |
249 | while(u) { | |
250 | digits[--dp] = c->specifier->digits[u % base]; | |
251 | u /= base; | |
252 | } | |
253 | ndigits = sizeof digits - dp; | |
254 | /* alternative form */ | |
255 | if(c->flags & f_hash) { | |
256 | switch(base) { | |
257 | case 8: | |
258 | if((dp == sizeof digits || digits[dp] != '0') | |
259 | && c->precision <= ndigits) | |
260 | c->precision = ndigits + 1; | |
261 | break; | |
262 | } | |
263 | if(!iszero && c->specifier->xform) | |
264 | xform = strlen(c->specifier->xform); | |
265 | else | |
266 | xform = 0; | |
267 | } else | |
268 | xform = 0; | |
269 | /* calculate number of 0s to add for precision */ | |
270 | if(ndigits < c->precision) | |
271 | prec = c->precision - ndigits; | |
272 | else | |
273 | prec = 0; | |
274 | /* bytes occupied by the sign */ | |
275 | if(sign) | |
276 | sign_bytes = 1; | |
277 | else | |
278 | sign_bytes = 0; | |
279 | /* XXX implement the ' ' flag */ | |
280 | /* calculate number of bytes of padding */ | |
281 | if(c->flags & f_width) { | |
282 | if((pad = c->width - (ndigits + prec + xform + sign_bytes)) < 0) | |
283 | pad = 0; | |
284 | } else | |
285 | pad = 0; | |
286 | /* now we are ready to output. Possibilities are: | |
287 | * [space pad][sign][xform][0 prec]digits | |
288 | * [sign][xform][0 pad][0 prec]digits | |
289 | * [sign][xform][0 prec]digits[space pad] | |
290 | * | |
291 | * '-' beats '0'. | |
292 | */ | |
293 | if(c->flags & f_left) { | |
681cb9fb RK |
294 | if(sign && do_write(s, &sign, 1)) |
295 | return -1; | |
296 | if(xform && do_write(s, c->specifier->xform, xform)) | |
297 | return -1; | |
298 | if(prec && do_pad(s, '0', prec) < 0) | |
299 | return -1; | |
300 | if(ndigits && do_write(s, digits + dp, ndigits)) | |
301 | return -1; | |
302 | if(pad && do_pad(s, ' ', pad) < 0) | |
303 | return -1; | |
460b9539 | 304 | } else if(c->flags & f_zero) { |
681cb9fb RK |
305 | if(sign && do_write(s, &sign, 1)) |
306 | return -1; | |
307 | if(xform && do_write(s, c->specifier->xform, xform)) | |
308 | return -1; | |
309 | if(pad && do_pad(s, '0', pad) < 0) | |
310 | return -1; | |
311 | if(prec && do_pad(s, '0', prec) < 0) | |
312 | return -1; | |
313 | if(ndigits && do_write(s, digits + dp, ndigits)) | |
314 | return -1; | |
460b9539 | 315 | } else { |
681cb9fb RK |
316 | if(pad && do_pad(s, ' ', pad) < 0) |
317 | return -1; | |
318 | if(sign && do_write(s, &sign, 1)) | |
319 | return -1; | |
320 | if(xform && do_write(s, c->specifier->xform, xform)) | |
321 | return -1; | |
322 | if(prec && do_pad(s, '0', prec) < 0) | |
323 | return -1; | |
324 | if(ndigits && do_write(s, digits + dp, ndigits)) | |
325 | return -1; | |
460b9539 | 326 | } |
327 | return 0; | |
328 | } | |
329 | ||
330 | static int output_string(struct state *s, struct conversion *c) { | |
331 | const char *str, *n; | |
332 | int pad, len; | |
333 | ||
6a6b327d | 334 | str = va_arg(s->ap, const char *); |
460b9539 | 335 | if(c->flags & f_precision) { |
336 | if((n = memchr(str, 0, c->precision))) | |
337 | len = n - str; | |
338 | else | |
339 | len = c->precision; | |
340 | } else | |
341 | len = strlen(str); | |
342 | if(c->flags & f_width) { | |
343 | if((pad = c->width - len) < 0) | |
344 | pad = 0; | |
345 | } else | |
346 | pad = 0; | |
347 | if(c->flags & f_left) { | |
681cb9fb RK |
348 | if(do_write(s, str, len) < 0) |
349 | return -1; | |
350 | if(pad && do_pad(s, ' ', pad) < 0) | |
351 | return -1; | |
460b9539 | 352 | } else { |
681cb9fb RK |
353 | if(pad && do_pad(s, ' ', pad) < 0) |
354 | return -1; | |
355 | if(do_write(s, str, len) < 0) | |
356 | return -1; | |
460b9539 | 357 | } |
358 | return 0; | |
359 | ||
360 | } | |
361 | ||
362 | static int output_char(struct state *s, struct conversion *c) { | |
363 | int pad; | |
364 | char ch; | |
365 | ||
6a6b327d | 366 | ch = va_arg(s->ap, int); |
460b9539 | 367 | if(c->flags & f_width) { |
368 | if((pad = c->width - 1) < 0) | |
369 | pad = 0; | |
370 | } else | |
371 | pad = 0; | |
372 | if(c->flags & f_left) { | |
681cb9fb RK |
373 | if(do_write(s, &ch, 1) < 0) |
374 | return -1; | |
375 | if(pad && do_pad(s, ' ', pad) < 0) | |
376 | return -1; | |
460b9539 | 377 | } else { |
681cb9fb RK |
378 | if(pad && do_pad(s, ' ', pad) < 0) |
379 | return -1; | |
380 | if(do_write(s, &ch, 1) < 0) | |
381 | return -1; | |
460b9539 | 382 | } |
383 | return 0; | |
384 | } | |
385 | ||
386 | static int output_count(struct state *s, struct conversion *c) { | |
387 | switch(c->length) { | |
6a6b327d RK |
388 | case 0: *va_arg(s->ap, int *) = s->bytes; break; |
389 | case l_char: *va_arg(s->ap, signed char *) = s->bytes; break; | |
390 | case l_short: *va_arg(s->ap, short *) = s->bytes; break; | |
391 | case l_long: *va_arg(s->ap, long *) = s->bytes; break; | |
392 | case l_longlong: *va_arg(s->ap, long_long *) = s->bytes; break; | |
393 | case l_intmax_t: *va_arg(s->ap, intmax_t *) = s->bytes; break; | |
394 | case l_size_t: *va_arg(s->ap, ssize_t *) = s->bytes; break; | |
395 | case l_ptrdiff_t: *va_arg(s->ap, ptrdiff_t *) = s->bytes; break; | |
460b9539 | 396 | default: abort(); |
397 | } | |
398 | return 0; | |
399 | } | |
400 | ||
401 | /* table of conversion specifiers */ | |
402 | static const struct specifier specifiers[] = { | |
403 | /* XXX don't support floating point conversions */ | |
404 | { '%', check_percent, output_percent, 0, 0, 0 }, | |
405 | { 'X', check_integer, output_integer, 16, "0123456789ABCDEF", "0X" }, | |
406 | { 'c', check_string, output_char, 0, 0, 0 }, | |
407 | { 'd', check_integer, output_integer, -10, "0123456789", 0 }, | |
408 | { 'i', check_integer, output_integer, -10, "0123456789", 0 }, | |
409 | { 'n', check_integer, output_count, 0, 0, 0 }, | |
410 | { 'o', check_integer, output_integer, 8, "01234567", 0 }, | |
411 | { 'p', check_pointer, output_integer, 16, "0123456789abcdef", "0x" }, | |
412 | { 's', check_string, output_string, 0, 0, 0 }, | |
413 | { 'u', check_integer, output_integer, 10, "0123456789", 0 }, | |
414 | { 'x', check_integer, output_integer, 16, "0123456789abcdef", "0x" }, | |
415 | }; | |
416 | ||
417 | /* collect and check information about a conversion specification */ | |
418 | static int parse_conversion(struct conversion *c, const char *ptr) { | |
419 | int n, ch, l, r, m; | |
420 | const char *q, *start = ptr; | |
421 | ||
422 | memset(c, 0, sizeof *c); | |
423 | /* flags */ | |
424 | while(*ptr && (q = strchr(flags, *ptr))) { | |
425 | c->flags |= (1 << (q - flags)); | |
426 | ++ptr; | |
427 | } | |
428 | /* minimum field width */ | |
429 | if(*ptr >= '0' && *ptr <= '9') { | |
681cb9fb RK |
430 | if((n = get_integer(&c->width, ptr)) < 0) |
431 | return -1; | |
460b9539 | 432 | ptr += n; |
433 | c->flags |= f_width; | |
434 | } else if(*ptr == '*') { | |
435 | ++ptr; | |
436 | c->width = -1; | |
437 | c->flags |= f_width; | |
438 | } | |
439 | /* precision */ | |
440 | if(*ptr == '.') { | |
441 | ++ptr; | |
442 | if(*ptr >= '0' && *ptr <= '9') { | |
681cb9fb RK |
443 | if((n = get_integer(&c->precision, ptr)) < 0) |
444 | return -1; | |
460b9539 | 445 | ptr += n; |
446 | } else if(*ptr == '*') { | |
447 | ++ptr; | |
448 | c->precision = -1; | |
449 | } else | |
0c740e59 | 450 | c->precision = 0; |
460b9539 | 451 | c->flags |= f_precision; |
452 | } | |
453 | /* length modifier */ | |
454 | switch(ch = *ptr++) { | |
455 | case 'h': | |
681cb9fb RK |
456 | if((ch = *ptr++) == 'h') { |
457 | c->length = l_char; | |
458 | ch = *ptr++; | |
459 | } | |
460 | else | |
461 | c->length = l_short; | |
460b9539 | 462 | break; |
463 | case 'l': | |
681cb9fb RK |
464 | if((ch = *ptr++) == 'l') { |
465 | c->length = l_longlong; | |
466 | ch = *ptr++; | |
467 | } | |
468 | else | |
469 | c->length = l_long; | |
460b9539 | 470 | break; |
471 | case 'q': c->length = l_longlong; ch = *ptr++; break; | |
472 | case 'j': c->length = l_intmax_t; ch = *ptr++; break; | |
473 | case 'z': c->length = l_size_t; ch = *ptr++; break; | |
474 | case 't': c->length = l_ptrdiff_t; ch = *ptr++; break; | |
475 | case 'L': c->length = l_longdouble; ch = *ptr++; break; | |
476 | } | |
477 | /* conversion specifier */ | |
478 | l = 0; | |
479 | r = sizeof specifiers / sizeof *specifiers; | |
480 | while(l <= r && (specifiers[m = (l + r) / 2].ch != ch)) | |
681cb9fb RK |
481 | if(ch < specifiers[m].ch) |
482 | r = m - 1; | |
483 | else | |
484 | l = m + 1; | |
485 | if(specifiers[m].ch != ch) | |
486 | return -1; | |
487 | if(specifiers[m].check(c)) | |
488 | return -1; | |
460b9539 | 489 | c->specifier = &specifiers[m]; |
490 | return ptr - start; | |
491 | } | |
492 | ||
493 | /* ISO/IEC 9899:1999 7.19.6.1 */ | |
494 | /* http://www.opengroup.org/onlinepubs/009695399/functions/fprintf.html */ | |
495 | ||
496 | int byte_vsinkprintf(struct sink *output, | |
497 | const char *fmt, | |
498 | va_list ap) { | |
499 | int n; | |
500 | const char *ptr; | |
501 | struct state s; | |
502 | struct conversion c; | |
503 | ||
504 | memset(&s, 0, sizeof s); | |
505 | s.output = output; | |
6a6b327d | 506 | va_copy(s.ap,ap); |
460b9539 | 507 | while(*fmt) { |
508 | /* output text up to next conversion specification */ | |
509 | for(ptr = fmt; *fmt && *fmt != '%'; ++fmt) | |
510 | ; | |
511 | if((n = fmt - ptr)) | |
681cb9fb RK |
512 | if(do_write(&s, ptr, n) < 0) |
513 | goto error; | |
460b9539 | 514 | if(!*fmt) |
515 | break; | |
516 | ++fmt; | |
517 | /* parse conversion */ | |
681cb9fb RK |
518 | if((n = parse_conversion(&c, fmt)) < 0) |
519 | goto error; | |
460b9539 | 520 | fmt += n; |
521 | /* fill in width and precision */ | |
522 | if((c.flags & f_width) && c.width == -1) | |
6a6b327d | 523 | if((c.width = va_arg(s.ap, int)) < 0) { |
460b9539 | 524 | c.width = -c.width; |
525 | c.flags |= f_left; | |
526 | } | |
527 | if((c.flags & f_precision) && c.precision == -1) | |
6a6b327d | 528 | if((c.precision = va_arg(s.ap, int)) < 0) |
460b9539 | 529 | c.flags ^= f_precision; |
530 | /* generate the output */ | |
681cb9fb RK |
531 | if(c.specifier->output(&s, &c) < 0) |
532 | goto error; | |
460b9539 | 533 | } |
6a6b327d | 534 | va_end(s.ap); |
460b9539 | 535 | return s.bytes; |
6a6b327d RK |
536 | error: |
537 | va_end(s.ap); | |
538 | return -1; | |
460b9539 | 539 | } |
540 | ||
681cb9fb RK |
541 | int byte_sinkprintf(struct sink *output, const char *fmt, ...) { |
542 | int n; | |
543 | va_list ap; | |
544 | ||
545 | va_start(ap, fmt); | |
546 | n = byte_vsinkprintf(output, fmt, ap); | |
547 | va_end(ap); | |
548 | return n; | |
549 | } | |
550 | ||
460b9539 | 551 | /* |
552 | Local Variables: | |
553 | c-basic-offset:2 | |
554 | comment-column:40 | |
555 | End: | |
556 | */ |