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 | ||
05b75f8d | 24 | #include "common.h" |
460b9539 | 25 | |
460b9539 | 26 | #include <stdarg.h> |
460b9539 | 27 | #include <errno.h> |
460b9539 | 28 | #include <stddef.h> |
29 | ||
30 | #include "printf.h" | |
31 | #include "sink.h" | |
e3426f7b | 32 | #include "vacopy.h" |
460b9539 | 33 | |
34 | enum flags { | |
35 | f_thousands = 1, | |
36 | f_left = 2, | |
37 | f_sign = 4, | |
38 | f_space = 8, | |
39 | f_hash = 16, | |
40 | f_zero = 32, | |
41 | f_width = 256, | |
42 | f_precision = 512 | |
43 | }; | |
44 | ||
45 | enum lengths { | |
46 | l_char = 1, | |
47 | l_short, | |
48 | l_long, | |
49 | l_longlong, | |
50 | l_size_t, | |
51 | l_intmax_t, | |
52 | l_ptrdiff_t, | |
53 | l_longdouble | |
54 | }; | |
55 | ||
56 | struct conversion; | |
57 | ||
58 | struct state { | |
59 | struct sink *output; | |
60 | int bytes; | |
6a6b327d | 61 | va_list ap; |
460b9539 | 62 | }; |
63 | ||
64 | struct specifier { | |
65 | int ch; | |
66 | int (*check)(const struct conversion *c); | |
67 | int (*output)(struct state *s, struct conversion *c); | |
68 | int base; | |
69 | const char *digits; | |
70 | const char *xform; | |
71 | }; | |
72 | ||
73 | struct conversion { | |
74 | unsigned flags; | |
75 | int width; | |
76 | int precision; | |
77 | int length; | |
78 | const struct specifier *specifier; | |
79 | }; | |
80 | ||
81 | static const char flags[] = "'-+ #0"; | |
82 | ||
83 | /* write @nbytes@ to the output. Return -1 on error, 0 on success. | |
84 | * Keeps track of the number of bytes written. */ | |
85 | static int do_write(struct state *s, | |
86 | const void *buffer, | |
87 | int nbytes) { | |
88 | if(s->bytes > INT_MAX - nbytes) { | |
89 | #ifdef EOVERFLOW | |
90 | errno = EOVERFLOW; | |
91 | #endif | |
92 | return -1; | |
93 | } | |
681cb9fb RK |
94 | if(s->output->write(s->output, buffer, nbytes) < 0) |
95 | return -1; | |
460b9539 | 96 | s->bytes += nbytes; |
97 | return 0; | |
98 | } | |
99 | ||
100 | /* write character @ch@ @n@ times, reasonably efficiently */ | |
101 | static int do_pad(struct state *s, int ch, unsigned n) { | |
102 | unsigned t; | |
103 | const char *padding; | |
104 | ||
105 | switch(ch) { | |
106 | case ' ': padding = " "; break; | |
107 | case '0': padding = "00000000000000000000000000000000"; break; | |
108 | default: abort(); | |
109 | } | |
110 | t = n / 32; | |
111 | n %= 32; | |
112 | while(t-- > 0) | |
681cb9fb RK |
113 | if(do_write(s, padding, 32) < 0) |
114 | return -1; | |
460b9539 | 115 | if(n > 0) |
681cb9fb RK |
116 | if(do_write(s, padding, n) < 0) |
117 | return -1; | |
460b9539 | 118 | return 0; |
119 | } | |
120 | ||
121 | /* pick up the integer at @ptr@, returning it via @intp@. Return the | |
122 | * number of characters consumed. Return 0 if there is no integer | |
123 | * there and -1 if an error occurred (e.g. too big) */ | |
124 | static int get_integer(int *intp, const char *ptr) { | |
125 | long n; | |
126 | char *e; | |
127 | ||
128 | errno = 0; | |
129 | n = strtol(ptr, &e, 10); | |
681cb9fb RK |
130 | if(errno || n > INT_MAX || n < INT_MIN || e == ptr) |
131 | return -1; | |
460b9539 | 132 | *intp = n; |
133 | return e - ptr; | |
134 | } | |
135 | ||
136 | /* consistency checks for various conversion specifications */ | |
137 | ||
138 | static int check_integer(const struct conversion *c) { | |
139 | switch(c->length) { | |
140 | case 0: | |
141 | case l_char: | |
142 | case l_short: | |
143 | case l_long: | |
144 | case l_longlong: | |
145 | case l_intmax_t: | |
146 | case l_size_t: | |
147 | case l_longdouble: | |
cb9a695c | 148 | case l_ptrdiff_t: |
460b9539 | 149 | return 0; |
150 | default: | |
151 | return -1; | |
152 | } | |
153 | } | |
154 | ||
155 | static int check_string(const struct conversion *c) { | |
156 | switch(c->length) { | |
157 | case 0: | |
158 | /* XXX don't support %ls, %lc */ | |
159 | return 0; | |
160 | default: | |
161 | return -1; | |
162 | } | |
163 | } | |
164 | ||
165 | static int check_pointer(const struct conversion *c) { | |
681cb9fb RK |
166 | if(c->length) |
167 | return -1; | |
460b9539 | 168 | return 0; |
169 | } | |
170 | ||
171 | static int check_percent(const struct conversion *c) { | |
681cb9fb RK |
172 | if(c->flags || c->width || c->precision || c->length) |
173 | return -1; | |
460b9539 | 174 | return 0; |
175 | } | |
176 | ||
177 | /* output functions for various conversion specifications */ | |
178 | ||
179 | static int output_percent(struct state *s, | |
180 | struct conversion attribute((unused)) *c) { | |
181 | return do_write(s, "%", 1); | |
182 | } | |
183 | ||
184 | static int output_integer(struct state *s, struct conversion *c) { | |
185 | uintmax_t u; | |
186 | intmax_t l; | |
187 | char sign; | |
188 | int base, dp, iszero, ndigits, prec, xform, sign_bytes, pad; | |
189 | char digits[CHAR_BIT * sizeof (uintmax_t)]; /* overestimate */ | |
190 | ||
191 | switch(c->specifier->ch) { | |
192 | default: | |
193 | if(c->specifier->base < 0) { | |
194 | switch(c->length) { | |
6a6b327d RK |
195 | case 0: l = va_arg(s->ap, int); break; |
196 | case l_char: l = (signed char)va_arg(s->ap, int); break; | |
197 | case l_short: l = (short)va_arg(s->ap, int); break; | |
198 | case l_long: l = va_arg(s->ap, long); break; | |
199 | case l_longlong: l = va_arg(s->ap, long_long); break; | |
200 | case l_intmax_t: l = va_arg(s->ap, intmax_t); break; | |
201 | case l_size_t: l = va_arg(s->ap, ssize_t); break; | |
202 | case l_ptrdiff_t: l = va_arg(s->ap, ptrdiff_t); break; | |
460b9539 | 203 | default: abort(); |
204 | } | |
205 | base = -c->specifier->base; | |
206 | if(l < 0) { | |
207 | u = -l; | |
208 | sign = '-'; | |
209 | } else { | |
210 | u = l; | |
211 | sign = 0; | |
212 | } | |
213 | } else { | |
214 | switch(c->length) { | |
6a6b327d RK |
215 | case 0: u = va_arg(s->ap, unsigned int); break; |
216 | case l_char: u = (unsigned char)va_arg(s->ap, unsigned int); break; | |
217 | case l_short: u = (unsigned short)va_arg(s->ap, unsigned int); break; | |
218 | case l_long: u = va_arg(s->ap, unsigned long); break; | |
219 | case l_longlong: u = va_arg(s->ap, u_long_long); break; | |
220 | case l_intmax_t: u = va_arg(s->ap, uintmax_t); break; | |
221 | case l_size_t: u = va_arg(s->ap, size_t); break; | |
222 | case l_ptrdiff_t: u = va_arg(s->ap, ptrdiff_t); break; | |
460b9539 | 223 | default: abort(); |
224 | } | |
225 | base = c->specifier->base; | |
226 | sign = 0; | |
227 | } | |
228 | break; | |
229 | case 'p': | |
6a6b327d | 230 | u = (uintptr_t)va_arg(s->ap, void *); |
460b9539 | 231 | c->flags |= f_hash; |
232 | base = c->specifier->base; | |
233 | sign = 0; | |
234 | break; | |
235 | } | |
236 | /* default precision */ | |
237 | if(!(c->flags & f_precision)) | |
238 | c->precision = 1; | |
239 | /* enforce sign */ | |
681cb9fb RK |
240 | if((c->flags & f_sign) && !sign) |
241 | sign = '+'; | |
460b9539 | 242 | /* compute the digits */ |
243 | iszero = (u == 0); | |
244 | dp = sizeof digits; | |
245 | while(u) { | |
246 | digits[--dp] = c->specifier->digits[u % base]; | |
247 | u /= base; | |
248 | } | |
249 | ndigits = sizeof digits - dp; | |
250 | /* alternative form */ | |
251 | if(c->flags & f_hash) { | |
252 | switch(base) { | |
253 | case 8: | |
254 | if((dp == sizeof digits || digits[dp] != '0') | |
255 | && c->precision <= ndigits) | |
256 | c->precision = ndigits + 1; | |
257 | break; | |
258 | } | |
259 | if(!iszero && c->specifier->xform) | |
260 | xform = strlen(c->specifier->xform); | |
261 | else | |
262 | xform = 0; | |
263 | } else | |
264 | xform = 0; | |
265 | /* calculate number of 0s to add for precision */ | |
266 | if(ndigits < c->precision) | |
267 | prec = c->precision - ndigits; | |
268 | else | |
269 | prec = 0; | |
270 | /* bytes occupied by the sign */ | |
271 | if(sign) | |
272 | sign_bytes = 1; | |
273 | else | |
274 | sign_bytes = 0; | |
275 | /* XXX implement the ' ' flag */ | |
276 | /* calculate number of bytes of padding */ | |
277 | if(c->flags & f_width) { | |
278 | if((pad = c->width - (ndigits + prec + xform + sign_bytes)) < 0) | |
279 | pad = 0; | |
280 | } else | |
281 | pad = 0; | |
282 | /* now we are ready to output. Possibilities are: | |
283 | * [space pad][sign][xform][0 prec]digits | |
284 | * [sign][xform][0 pad][0 prec]digits | |
285 | * [sign][xform][0 prec]digits[space pad] | |
286 | * | |
287 | * '-' beats '0'. | |
288 | */ | |
289 | if(c->flags & f_left) { | |
681cb9fb RK |
290 | if(sign && do_write(s, &sign, 1)) |
291 | return -1; | |
292 | if(xform && do_write(s, c->specifier->xform, xform)) | |
293 | return -1; | |
294 | if(prec && do_pad(s, '0', prec) < 0) | |
295 | return -1; | |
296 | if(ndigits && do_write(s, digits + dp, ndigits)) | |
297 | return -1; | |
298 | if(pad && do_pad(s, ' ', pad) < 0) | |
299 | return -1; | |
460b9539 | 300 | } else if(c->flags & f_zero) { |
681cb9fb RK |
301 | if(sign && do_write(s, &sign, 1)) |
302 | return -1; | |
303 | if(xform && do_write(s, c->specifier->xform, xform)) | |
304 | return -1; | |
305 | if(pad && do_pad(s, '0', pad) < 0) | |
306 | return -1; | |
307 | if(prec && do_pad(s, '0', prec) < 0) | |
308 | return -1; | |
309 | if(ndigits && do_write(s, digits + dp, ndigits)) | |
310 | return -1; | |
460b9539 | 311 | } else { |
681cb9fb RK |
312 | if(pad && do_pad(s, ' ', pad) < 0) |
313 | return -1; | |
314 | if(sign && do_write(s, &sign, 1)) | |
315 | return -1; | |
316 | if(xform && do_write(s, c->specifier->xform, xform)) | |
317 | return -1; | |
318 | if(prec && do_pad(s, '0', prec) < 0) | |
319 | return -1; | |
320 | if(ndigits && do_write(s, digits + dp, ndigits)) | |
321 | return -1; | |
460b9539 | 322 | } |
323 | return 0; | |
324 | } | |
325 | ||
326 | static int output_string(struct state *s, struct conversion *c) { | |
327 | const char *str, *n; | |
328 | int pad, len; | |
329 | ||
6a6b327d | 330 | str = va_arg(s->ap, const char *); |
460b9539 | 331 | if(c->flags & f_precision) { |
332 | if((n = memchr(str, 0, c->precision))) | |
333 | len = n - str; | |
334 | else | |
335 | len = c->precision; | |
336 | } else | |
337 | len = strlen(str); | |
338 | if(c->flags & f_width) { | |
339 | if((pad = c->width - len) < 0) | |
340 | pad = 0; | |
341 | } else | |
342 | pad = 0; | |
343 | if(c->flags & f_left) { | |
681cb9fb RK |
344 | if(do_write(s, str, len) < 0) |
345 | return -1; | |
346 | if(pad && do_pad(s, ' ', pad) < 0) | |
347 | return -1; | |
460b9539 | 348 | } else { |
681cb9fb RK |
349 | if(pad && do_pad(s, ' ', pad) < 0) |
350 | return -1; | |
351 | if(do_write(s, str, len) < 0) | |
352 | return -1; | |
460b9539 | 353 | } |
354 | return 0; | |
355 | ||
356 | } | |
357 | ||
358 | static int output_char(struct state *s, struct conversion *c) { | |
359 | int pad; | |
360 | char ch; | |
361 | ||
6a6b327d | 362 | ch = va_arg(s->ap, int); |
460b9539 | 363 | if(c->flags & f_width) { |
364 | if((pad = c->width - 1) < 0) | |
365 | pad = 0; | |
366 | } else | |
367 | pad = 0; | |
368 | if(c->flags & f_left) { | |
681cb9fb RK |
369 | if(do_write(s, &ch, 1) < 0) |
370 | return -1; | |
371 | if(pad && do_pad(s, ' ', pad) < 0) | |
372 | return -1; | |
460b9539 | 373 | } else { |
681cb9fb RK |
374 | if(pad && do_pad(s, ' ', pad) < 0) |
375 | return -1; | |
376 | if(do_write(s, &ch, 1) < 0) | |
377 | return -1; | |
460b9539 | 378 | } |
379 | return 0; | |
380 | } | |
381 | ||
382 | static int output_count(struct state *s, struct conversion *c) { | |
383 | switch(c->length) { | |
6a6b327d RK |
384 | case 0: *va_arg(s->ap, int *) = s->bytes; break; |
385 | case l_char: *va_arg(s->ap, signed char *) = s->bytes; break; | |
386 | case l_short: *va_arg(s->ap, short *) = s->bytes; break; | |
387 | case l_long: *va_arg(s->ap, long *) = s->bytes; break; | |
388 | case l_longlong: *va_arg(s->ap, long_long *) = s->bytes; break; | |
389 | case l_intmax_t: *va_arg(s->ap, intmax_t *) = s->bytes; break; | |
390 | case l_size_t: *va_arg(s->ap, ssize_t *) = s->bytes; break; | |
391 | case l_ptrdiff_t: *va_arg(s->ap, ptrdiff_t *) = s->bytes; break; | |
460b9539 | 392 | default: abort(); |
393 | } | |
394 | return 0; | |
395 | } | |
396 | ||
397 | /* table of conversion specifiers */ | |
398 | static const struct specifier specifiers[] = { | |
399 | /* XXX don't support floating point conversions */ | |
400 | { '%', check_percent, output_percent, 0, 0, 0 }, | |
401 | { 'X', check_integer, output_integer, 16, "0123456789ABCDEF", "0X" }, | |
402 | { 'c', check_string, output_char, 0, 0, 0 }, | |
403 | { 'd', check_integer, output_integer, -10, "0123456789", 0 }, | |
404 | { 'i', check_integer, output_integer, -10, "0123456789", 0 }, | |
405 | { 'n', check_integer, output_count, 0, 0, 0 }, | |
406 | { 'o', check_integer, output_integer, 8, "01234567", 0 }, | |
407 | { 'p', check_pointer, output_integer, 16, "0123456789abcdef", "0x" }, | |
408 | { 's', check_string, output_string, 0, 0, 0 }, | |
409 | { 'u', check_integer, output_integer, 10, "0123456789", 0 }, | |
410 | { 'x', check_integer, output_integer, 16, "0123456789abcdef", "0x" }, | |
411 | }; | |
412 | ||
413 | /* collect and check information about a conversion specification */ | |
414 | static int parse_conversion(struct conversion *c, const char *ptr) { | |
415 | int n, ch, l, r, m; | |
416 | const char *q, *start = ptr; | |
417 | ||
418 | memset(c, 0, sizeof *c); | |
419 | /* flags */ | |
420 | while(*ptr && (q = strchr(flags, *ptr))) { | |
421 | c->flags |= (1 << (q - flags)); | |
422 | ++ptr; | |
423 | } | |
424 | /* minimum field width */ | |
425 | if(*ptr >= '0' && *ptr <= '9') { | |
681cb9fb RK |
426 | if((n = get_integer(&c->width, ptr)) < 0) |
427 | return -1; | |
460b9539 | 428 | ptr += n; |
429 | c->flags |= f_width; | |
430 | } else if(*ptr == '*') { | |
431 | ++ptr; | |
432 | c->width = -1; | |
433 | c->flags |= f_width; | |
434 | } | |
435 | /* precision */ | |
436 | if(*ptr == '.') { | |
437 | ++ptr; | |
438 | if(*ptr >= '0' && *ptr <= '9') { | |
681cb9fb RK |
439 | if((n = get_integer(&c->precision, ptr)) < 0) |
440 | return -1; | |
460b9539 | 441 | ptr += n; |
442 | } else if(*ptr == '*') { | |
443 | ++ptr; | |
444 | c->precision = -1; | |
445 | } else | |
0c740e59 | 446 | c->precision = 0; |
460b9539 | 447 | c->flags |= f_precision; |
448 | } | |
449 | /* length modifier */ | |
450 | switch(ch = *ptr++) { | |
451 | case 'h': | |
681cb9fb RK |
452 | if((ch = *ptr++) == 'h') { |
453 | c->length = l_char; | |
454 | ch = *ptr++; | |
455 | } | |
456 | else | |
457 | c->length = l_short; | |
460b9539 | 458 | break; |
459 | case 'l': | |
681cb9fb RK |
460 | if((ch = *ptr++) == 'l') { |
461 | c->length = l_longlong; | |
462 | ch = *ptr++; | |
463 | } | |
464 | else | |
465 | c->length = l_long; | |
460b9539 | 466 | break; |
467 | case 'q': c->length = l_longlong; ch = *ptr++; break; | |
468 | case 'j': c->length = l_intmax_t; ch = *ptr++; break; | |
469 | case 'z': c->length = l_size_t; ch = *ptr++; break; | |
470 | case 't': c->length = l_ptrdiff_t; ch = *ptr++; break; | |
471 | case 'L': c->length = l_longdouble; ch = *ptr++; break; | |
472 | } | |
473 | /* conversion specifier */ | |
474 | l = 0; | |
475 | r = sizeof specifiers / sizeof *specifiers; | |
476 | while(l <= r && (specifiers[m = (l + r) / 2].ch != ch)) | |
681cb9fb RK |
477 | if(ch < specifiers[m].ch) |
478 | r = m - 1; | |
479 | else | |
480 | l = m + 1; | |
481 | if(specifiers[m].ch != ch) | |
482 | return -1; | |
483 | if(specifiers[m].check(c)) | |
484 | return -1; | |
460b9539 | 485 | c->specifier = &specifiers[m]; |
486 | return ptr - start; | |
487 | } | |
488 | ||
489 | /* ISO/IEC 9899:1999 7.19.6.1 */ | |
490 | /* http://www.opengroup.org/onlinepubs/009695399/functions/fprintf.html */ | |
491 | ||
492 | int byte_vsinkprintf(struct sink *output, | |
493 | const char *fmt, | |
494 | va_list ap) { | |
495 | int n; | |
496 | const char *ptr; | |
497 | struct state s; | |
498 | struct conversion c; | |
499 | ||
500 | memset(&s, 0, sizeof s); | |
501 | s.output = output; | |
6a6b327d | 502 | va_copy(s.ap,ap); |
460b9539 | 503 | while(*fmt) { |
504 | /* output text up to next conversion specification */ | |
505 | for(ptr = fmt; *fmt && *fmt != '%'; ++fmt) | |
506 | ; | |
507 | if((n = fmt - ptr)) | |
681cb9fb RK |
508 | if(do_write(&s, ptr, n) < 0) |
509 | goto error; | |
460b9539 | 510 | if(!*fmt) |
511 | break; | |
512 | ++fmt; | |
513 | /* parse conversion */ | |
681cb9fb RK |
514 | if((n = parse_conversion(&c, fmt)) < 0) |
515 | goto error; | |
460b9539 | 516 | fmt += n; |
517 | /* fill in width and precision */ | |
518 | if((c.flags & f_width) && c.width == -1) | |
6a6b327d | 519 | if((c.width = va_arg(s.ap, int)) < 0) { |
460b9539 | 520 | c.width = -c.width; |
521 | c.flags |= f_left; | |
522 | } | |
523 | if((c.flags & f_precision) && c.precision == -1) | |
6a6b327d | 524 | if((c.precision = va_arg(s.ap, int)) < 0) |
460b9539 | 525 | c.flags ^= f_precision; |
526 | /* generate the output */ | |
681cb9fb RK |
527 | if(c.specifier->output(&s, &c) < 0) |
528 | goto error; | |
460b9539 | 529 | } |
6a6b327d | 530 | va_end(s.ap); |
460b9539 | 531 | return s.bytes; |
6a6b327d RK |
532 | error: |
533 | va_end(s.ap); | |
534 | return -1; | |
460b9539 | 535 | } |
536 | ||
681cb9fb RK |
537 | int byte_sinkprintf(struct sink *output, const char *fmt, ...) { |
538 | int n; | |
539 | va_list ap; | |
540 | ||
541 | va_start(ap, fmt); | |
542 | n = byte_vsinkprintf(output, fmt, ap); | |
543 | va_end(ap); | |
544 | return n; | |
545 | } | |
546 | ||
460b9539 | 547 | /* |
548 | Local Variables: | |
549 | c-basic-offset:2 | |
550 | comment-column:40 | |
551 | End: | |
552 | */ |