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 | * |
e7eb3a27 | 5 | * This program is free software: you can redistribute it and/or modify |
460b9539 | 6 | * it under the terms of the GNU General Public License as published by |
e7eb3a27 | 7 | * the Free Software Foundation, either version 3 of the License, or |
460b9539 | 8 | * (at your option) any later version. |
e7eb3a27 RK |
9 | * |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | * | |
460b9539 | 15 | * You should have received a copy of the GNU General Public License |
e7eb3a27 | 16 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
460b9539 | 17 | */ |
18 | ||
19 | #define NO_MEMORY_ALLOCATION | |
20 | /* because byte_snprintf used from log.c */ | |
21 | ||
05b75f8d | 22 | #include "common.h" |
460b9539 | 23 | |
460b9539 | 24 | #include <stdarg.h> |
460b9539 | 25 | #include <errno.h> |
460b9539 | 26 | #include <stddef.h> |
27 | ||
28 | #include "printf.h" | |
29 | #include "sink.h" | |
e3426f7b | 30 | #include "vacopy.h" |
460b9539 | 31 | |
32 | enum flags { | |
33 | f_thousands = 1, | |
34 | f_left = 2, | |
35 | f_sign = 4, | |
36 | f_space = 8, | |
37 | f_hash = 16, | |
38 | f_zero = 32, | |
39 | f_width = 256, | |
40 | f_precision = 512 | |
41 | }; | |
42 | ||
43 | enum lengths { | |
44 | l_char = 1, | |
45 | l_short, | |
46 | l_long, | |
47 | l_longlong, | |
48 | l_size_t, | |
49 | l_intmax_t, | |
50 | l_ptrdiff_t, | |
51 | l_longdouble | |
52 | }; | |
53 | ||
54 | struct conversion; | |
55 | ||
56 | struct state { | |
57 | struct sink *output; | |
58 | int bytes; | |
6a6b327d | 59 | va_list ap; |
460b9539 | 60 | }; |
61 | ||
62 | struct specifier { | |
63 | int ch; | |
64 | int (*check)(const struct conversion *c); | |
65 | int (*output)(struct state *s, struct conversion *c); | |
66 | int base; | |
67 | const char *digits; | |
68 | const char *xform; | |
69 | }; | |
70 | ||
71 | struct conversion { | |
72 | unsigned flags; | |
73 | int width; | |
74 | int precision; | |
75 | int length; | |
76 | const struct specifier *specifier; | |
77 | }; | |
78 | ||
79 | static const char flags[] = "'-+ #0"; | |
80 | ||
81 | /* write @nbytes@ to the output. Return -1 on error, 0 on success. | |
82 | * Keeps track of the number of bytes written. */ | |
83 | static int do_write(struct state *s, | |
84 | const void *buffer, | |
85 | int nbytes) { | |
86 | if(s->bytes > INT_MAX - nbytes) { | |
87 | #ifdef EOVERFLOW | |
88 | errno = EOVERFLOW; | |
89 | #endif | |
90 | return -1; | |
91 | } | |
681cb9fb RK |
92 | if(s->output->write(s->output, buffer, nbytes) < 0) |
93 | return -1; | |
460b9539 | 94 | s->bytes += nbytes; |
95 | return 0; | |
96 | } | |
97 | ||
98 | /* write character @ch@ @n@ times, reasonably efficiently */ | |
99 | static int do_pad(struct state *s, int ch, unsigned n) { | |
100 | unsigned t; | |
101 | const char *padding; | |
102 | ||
103 | switch(ch) { | |
104 | case ' ': padding = " "; break; | |
105 | case '0': padding = "00000000000000000000000000000000"; break; | |
106 | default: abort(); | |
107 | } | |
108 | t = n / 32; | |
109 | n %= 32; | |
110 | while(t-- > 0) | |
681cb9fb RK |
111 | if(do_write(s, padding, 32) < 0) |
112 | return -1; | |
460b9539 | 113 | if(n > 0) |
681cb9fb RK |
114 | if(do_write(s, padding, n) < 0) |
115 | return -1; | |
460b9539 | 116 | return 0; |
117 | } | |
118 | ||
119 | /* pick up the integer at @ptr@, returning it via @intp@. Return the | |
120 | * number of characters consumed. Return 0 if there is no integer | |
121 | * there and -1 if an error occurred (e.g. too big) */ | |
122 | static int get_integer(int *intp, const char *ptr) { | |
123 | long n; | |
124 | char *e; | |
125 | ||
126 | errno = 0; | |
127 | n = strtol(ptr, &e, 10); | |
681cb9fb RK |
128 | if(errno || n > INT_MAX || n < INT_MIN || e == ptr) |
129 | return -1; | |
460b9539 | 130 | *intp = n; |
131 | return e - ptr; | |
132 | } | |
133 | ||
134 | /* consistency checks for various conversion specifications */ | |
135 | ||
136 | static int check_integer(const struct conversion *c) { | |
137 | switch(c->length) { | |
138 | case 0: | |
139 | case l_char: | |
140 | case l_short: | |
141 | case l_long: | |
142 | case l_longlong: | |
143 | case l_intmax_t: | |
144 | case l_size_t: | |
145 | case l_longdouble: | |
cb9a695c | 146 | case l_ptrdiff_t: |
460b9539 | 147 | return 0; |
148 | default: | |
149 | return -1; | |
150 | } | |
151 | } | |
152 | ||
153 | static int check_string(const struct conversion *c) { | |
154 | switch(c->length) { | |
155 | case 0: | |
156 | /* XXX don't support %ls, %lc */ | |
157 | return 0; | |
158 | default: | |
159 | return -1; | |
160 | } | |
161 | } | |
162 | ||
163 | static int check_pointer(const struct conversion *c) { | |
681cb9fb RK |
164 | if(c->length) |
165 | return -1; | |
460b9539 | 166 | return 0; |
167 | } | |
168 | ||
169 | static int check_percent(const struct conversion *c) { | |
681cb9fb RK |
170 | if(c->flags || c->width || c->precision || c->length) |
171 | return -1; | |
460b9539 | 172 | return 0; |
173 | } | |
174 | ||
175 | /* output functions for various conversion specifications */ | |
176 | ||
177 | static int output_percent(struct state *s, | |
178 | struct conversion attribute((unused)) *c) { | |
179 | return do_write(s, "%", 1); | |
180 | } | |
181 | ||
182 | static int output_integer(struct state *s, struct conversion *c) { | |
183 | uintmax_t u; | |
184 | intmax_t l; | |
185 | char sign; | |
186 | int base, dp, iszero, ndigits, prec, xform, sign_bytes, pad; | |
187 | char digits[CHAR_BIT * sizeof (uintmax_t)]; /* overestimate */ | |
188 | ||
189 | switch(c->specifier->ch) { | |
190 | default: | |
191 | if(c->specifier->base < 0) { | |
192 | switch(c->length) { | |
6a6b327d RK |
193 | case 0: l = va_arg(s->ap, int); break; |
194 | case l_char: l = (signed char)va_arg(s->ap, int); break; | |
195 | case l_short: l = (short)va_arg(s->ap, int); break; | |
196 | case l_long: l = va_arg(s->ap, long); break; | |
197 | case l_longlong: l = va_arg(s->ap, long_long); break; | |
198 | case l_intmax_t: l = va_arg(s->ap, intmax_t); break; | |
199 | case l_size_t: l = va_arg(s->ap, ssize_t); break; | |
200 | case l_ptrdiff_t: l = va_arg(s->ap, ptrdiff_t); break; | |
460b9539 | 201 | default: abort(); |
202 | } | |
203 | base = -c->specifier->base; | |
204 | if(l < 0) { | |
205 | u = -l; | |
206 | sign = '-'; | |
207 | } else { | |
208 | u = l; | |
209 | sign = 0; | |
210 | } | |
211 | } else { | |
212 | switch(c->length) { | |
6a6b327d RK |
213 | case 0: u = va_arg(s->ap, unsigned int); break; |
214 | case l_char: u = (unsigned char)va_arg(s->ap, unsigned int); break; | |
215 | case l_short: u = (unsigned short)va_arg(s->ap, unsigned int); break; | |
216 | case l_long: u = va_arg(s->ap, unsigned long); break; | |
217 | case l_longlong: u = va_arg(s->ap, u_long_long); break; | |
218 | case l_intmax_t: u = va_arg(s->ap, uintmax_t); break; | |
219 | case l_size_t: u = va_arg(s->ap, size_t); break; | |
220 | case l_ptrdiff_t: u = va_arg(s->ap, ptrdiff_t); break; | |
460b9539 | 221 | default: abort(); |
222 | } | |
223 | base = c->specifier->base; | |
224 | sign = 0; | |
225 | } | |
226 | break; | |
227 | case 'p': | |
6a6b327d | 228 | u = (uintptr_t)va_arg(s->ap, void *); |
460b9539 | 229 | c->flags |= f_hash; |
230 | base = c->specifier->base; | |
231 | sign = 0; | |
232 | break; | |
233 | } | |
234 | /* default precision */ | |
235 | if(!(c->flags & f_precision)) | |
236 | c->precision = 1; | |
237 | /* enforce sign */ | |
681cb9fb RK |
238 | if((c->flags & f_sign) && !sign) |
239 | sign = '+'; | |
460b9539 | 240 | /* compute the digits */ |
241 | iszero = (u == 0); | |
242 | dp = sizeof digits; | |
243 | while(u) { | |
244 | digits[--dp] = c->specifier->digits[u % base]; | |
245 | u /= base; | |
246 | } | |
247 | ndigits = sizeof digits - dp; | |
248 | /* alternative form */ | |
249 | if(c->flags & f_hash) { | |
250 | switch(base) { | |
251 | case 8: | |
252 | if((dp == sizeof digits || digits[dp] != '0') | |
253 | && c->precision <= ndigits) | |
254 | c->precision = ndigits + 1; | |
255 | break; | |
256 | } | |
257 | if(!iszero && c->specifier->xform) | |
258 | xform = strlen(c->specifier->xform); | |
259 | else | |
260 | xform = 0; | |
261 | } else | |
262 | xform = 0; | |
263 | /* calculate number of 0s to add for precision */ | |
264 | if(ndigits < c->precision) | |
265 | prec = c->precision - ndigits; | |
266 | else | |
267 | prec = 0; | |
268 | /* bytes occupied by the sign */ | |
269 | if(sign) | |
270 | sign_bytes = 1; | |
271 | else | |
272 | sign_bytes = 0; | |
273 | /* XXX implement the ' ' flag */ | |
274 | /* calculate number of bytes of padding */ | |
275 | if(c->flags & f_width) { | |
276 | if((pad = c->width - (ndigits + prec + xform + sign_bytes)) < 0) | |
277 | pad = 0; | |
278 | } else | |
279 | pad = 0; | |
280 | /* now we are ready to output. Possibilities are: | |
281 | * [space pad][sign][xform][0 prec]digits | |
282 | * [sign][xform][0 pad][0 prec]digits | |
283 | * [sign][xform][0 prec]digits[space pad] | |
284 | * | |
285 | * '-' beats '0'. | |
286 | */ | |
287 | if(c->flags & f_left) { | |
681cb9fb RK |
288 | if(sign && do_write(s, &sign, 1)) |
289 | return -1; | |
290 | if(xform && do_write(s, c->specifier->xform, xform)) | |
291 | return -1; | |
292 | if(prec && do_pad(s, '0', prec) < 0) | |
293 | return -1; | |
294 | if(ndigits && do_write(s, digits + dp, ndigits)) | |
295 | return -1; | |
296 | if(pad && do_pad(s, ' ', pad) < 0) | |
297 | return -1; | |
460b9539 | 298 | } else if(c->flags & f_zero) { |
681cb9fb RK |
299 | if(sign && do_write(s, &sign, 1)) |
300 | return -1; | |
301 | if(xform && do_write(s, c->specifier->xform, xform)) | |
302 | return -1; | |
303 | if(pad && do_pad(s, '0', pad) < 0) | |
304 | return -1; | |
305 | if(prec && do_pad(s, '0', prec) < 0) | |
306 | return -1; | |
307 | if(ndigits && do_write(s, digits + dp, ndigits)) | |
308 | return -1; | |
460b9539 | 309 | } else { |
681cb9fb RK |
310 | if(pad && do_pad(s, ' ', pad) < 0) |
311 | return -1; | |
312 | if(sign && do_write(s, &sign, 1)) | |
313 | return -1; | |
314 | if(xform && do_write(s, c->specifier->xform, xform)) | |
315 | return -1; | |
316 | if(prec && do_pad(s, '0', prec) < 0) | |
317 | return -1; | |
318 | if(ndigits && do_write(s, digits + dp, ndigits)) | |
319 | return -1; | |
460b9539 | 320 | } |
321 | return 0; | |
322 | } | |
323 | ||
324 | static int output_string(struct state *s, struct conversion *c) { | |
325 | const char *str, *n; | |
326 | int pad, len; | |
327 | ||
6a6b327d | 328 | str = va_arg(s->ap, const char *); |
460b9539 | 329 | if(c->flags & f_precision) { |
330 | if((n = memchr(str, 0, c->precision))) | |
331 | len = n - str; | |
332 | else | |
333 | len = c->precision; | |
334 | } else | |
335 | len = strlen(str); | |
336 | if(c->flags & f_width) { | |
337 | if((pad = c->width - len) < 0) | |
338 | pad = 0; | |
339 | } else | |
340 | pad = 0; | |
341 | if(c->flags & f_left) { | |
681cb9fb RK |
342 | if(do_write(s, str, len) < 0) |
343 | return -1; | |
344 | if(pad && do_pad(s, ' ', pad) < 0) | |
345 | return -1; | |
460b9539 | 346 | } else { |
681cb9fb RK |
347 | if(pad && do_pad(s, ' ', pad) < 0) |
348 | return -1; | |
349 | if(do_write(s, str, len) < 0) | |
350 | return -1; | |
460b9539 | 351 | } |
352 | return 0; | |
353 | ||
354 | } | |
355 | ||
356 | static int output_char(struct state *s, struct conversion *c) { | |
357 | int pad; | |
358 | char ch; | |
359 | ||
6a6b327d | 360 | ch = va_arg(s->ap, int); |
460b9539 | 361 | if(c->flags & f_width) { |
362 | if((pad = c->width - 1) < 0) | |
363 | pad = 0; | |
364 | } else | |
365 | pad = 0; | |
366 | if(c->flags & f_left) { | |
681cb9fb RK |
367 | if(do_write(s, &ch, 1) < 0) |
368 | return -1; | |
369 | if(pad && do_pad(s, ' ', pad) < 0) | |
370 | return -1; | |
460b9539 | 371 | } else { |
681cb9fb RK |
372 | if(pad && do_pad(s, ' ', pad) < 0) |
373 | return -1; | |
374 | if(do_write(s, &ch, 1) < 0) | |
375 | return -1; | |
460b9539 | 376 | } |
377 | return 0; | |
378 | } | |
379 | ||
380 | static int output_count(struct state *s, struct conversion *c) { | |
381 | switch(c->length) { | |
6a6b327d RK |
382 | case 0: *va_arg(s->ap, int *) = s->bytes; break; |
383 | case l_char: *va_arg(s->ap, signed char *) = s->bytes; break; | |
384 | case l_short: *va_arg(s->ap, short *) = s->bytes; break; | |
385 | case l_long: *va_arg(s->ap, long *) = s->bytes; break; | |
386 | case l_longlong: *va_arg(s->ap, long_long *) = s->bytes; break; | |
387 | case l_intmax_t: *va_arg(s->ap, intmax_t *) = s->bytes; break; | |
388 | case l_size_t: *va_arg(s->ap, ssize_t *) = s->bytes; break; | |
389 | case l_ptrdiff_t: *va_arg(s->ap, ptrdiff_t *) = s->bytes; break; | |
460b9539 | 390 | default: abort(); |
391 | } | |
392 | return 0; | |
393 | } | |
394 | ||
395 | /* table of conversion specifiers */ | |
396 | static const struct specifier specifiers[] = { | |
397 | /* XXX don't support floating point conversions */ | |
398 | { '%', check_percent, output_percent, 0, 0, 0 }, | |
399 | { 'X', check_integer, output_integer, 16, "0123456789ABCDEF", "0X" }, | |
400 | { 'c', check_string, output_char, 0, 0, 0 }, | |
401 | { 'd', check_integer, output_integer, -10, "0123456789", 0 }, | |
402 | { 'i', check_integer, output_integer, -10, "0123456789", 0 }, | |
403 | { 'n', check_integer, output_count, 0, 0, 0 }, | |
404 | { 'o', check_integer, output_integer, 8, "01234567", 0 }, | |
405 | { 'p', check_pointer, output_integer, 16, "0123456789abcdef", "0x" }, | |
406 | { 's', check_string, output_string, 0, 0, 0 }, | |
407 | { 'u', check_integer, output_integer, 10, "0123456789", 0 }, | |
408 | { 'x', check_integer, output_integer, 16, "0123456789abcdef", "0x" }, | |
409 | }; | |
410 | ||
411 | /* collect and check information about a conversion specification */ | |
412 | static int parse_conversion(struct conversion *c, const char *ptr) { | |
413 | int n, ch, l, r, m; | |
414 | const char *q, *start = ptr; | |
415 | ||
416 | memset(c, 0, sizeof *c); | |
417 | /* flags */ | |
418 | while(*ptr && (q = strchr(flags, *ptr))) { | |
419 | c->flags |= (1 << (q - flags)); | |
420 | ++ptr; | |
421 | } | |
422 | /* minimum field width */ | |
423 | if(*ptr >= '0' && *ptr <= '9') { | |
681cb9fb RK |
424 | if((n = get_integer(&c->width, ptr)) < 0) |
425 | return -1; | |
460b9539 | 426 | ptr += n; |
427 | c->flags |= f_width; | |
428 | } else if(*ptr == '*') { | |
429 | ++ptr; | |
430 | c->width = -1; | |
431 | c->flags |= f_width; | |
432 | } | |
433 | /* precision */ | |
434 | if(*ptr == '.') { | |
435 | ++ptr; | |
436 | if(*ptr >= '0' && *ptr <= '9') { | |
681cb9fb RK |
437 | if((n = get_integer(&c->precision, ptr)) < 0) |
438 | return -1; | |
460b9539 | 439 | ptr += n; |
440 | } else if(*ptr == '*') { | |
441 | ++ptr; | |
442 | c->precision = -1; | |
443 | } else | |
0c740e59 | 444 | c->precision = 0; |
460b9539 | 445 | c->flags |= f_precision; |
446 | } | |
447 | /* length modifier */ | |
448 | switch(ch = *ptr++) { | |
449 | case 'h': | |
681cb9fb RK |
450 | if((ch = *ptr++) == 'h') { |
451 | c->length = l_char; | |
452 | ch = *ptr++; | |
453 | } | |
454 | else | |
455 | c->length = l_short; | |
460b9539 | 456 | break; |
457 | case 'l': | |
681cb9fb RK |
458 | if((ch = *ptr++) == 'l') { |
459 | c->length = l_longlong; | |
460 | ch = *ptr++; | |
461 | } | |
462 | else | |
463 | c->length = l_long; | |
460b9539 | 464 | break; |
465 | case 'q': c->length = l_longlong; ch = *ptr++; break; | |
466 | case 'j': c->length = l_intmax_t; ch = *ptr++; break; | |
467 | case 'z': c->length = l_size_t; ch = *ptr++; break; | |
468 | case 't': c->length = l_ptrdiff_t; ch = *ptr++; break; | |
469 | case 'L': c->length = l_longdouble; ch = *ptr++; break; | |
470 | } | |
471 | /* conversion specifier */ | |
472 | l = 0; | |
473 | r = sizeof specifiers / sizeof *specifiers; | |
474 | while(l <= r && (specifiers[m = (l + r) / 2].ch != ch)) | |
681cb9fb RK |
475 | if(ch < specifiers[m].ch) |
476 | r = m - 1; | |
477 | else | |
478 | l = m + 1; | |
479 | if(specifiers[m].ch != ch) | |
480 | return -1; | |
481 | if(specifiers[m].check(c)) | |
482 | return -1; | |
460b9539 | 483 | c->specifier = &specifiers[m]; |
484 | return ptr - start; | |
485 | } | |
486 | ||
487 | /* ISO/IEC 9899:1999 7.19.6.1 */ | |
488 | /* http://www.opengroup.org/onlinepubs/009695399/functions/fprintf.html */ | |
489 | ||
490 | int byte_vsinkprintf(struct sink *output, | |
491 | const char *fmt, | |
492 | va_list ap) { | |
493 | int n; | |
494 | const char *ptr; | |
495 | struct state s; | |
496 | struct conversion c; | |
497 | ||
498 | memset(&s, 0, sizeof s); | |
499 | s.output = output; | |
6a6b327d | 500 | va_copy(s.ap,ap); |
460b9539 | 501 | while(*fmt) { |
502 | /* output text up to next conversion specification */ | |
503 | for(ptr = fmt; *fmt && *fmt != '%'; ++fmt) | |
504 | ; | |
505 | if((n = fmt - ptr)) | |
681cb9fb RK |
506 | if(do_write(&s, ptr, n) < 0) |
507 | goto error; | |
460b9539 | 508 | if(!*fmt) |
509 | break; | |
510 | ++fmt; | |
511 | /* parse conversion */ | |
681cb9fb RK |
512 | if((n = parse_conversion(&c, fmt)) < 0) |
513 | goto error; | |
460b9539 | 514 | fmt += n; |
515 | /* fill in width and precision */ | |
516 | if((c.flags & f_width) && c.width == -1) | |
6a6b327d | 517 | if((c.width = va_arg(s.ap, int)) < 0) { |
460b9539 | 518 | c.width = -c.width; |
519 | c.flags |= f_left; | |
520 | } | |
521 | if((c.flags & f_precision) && c.precision == -1) | |
6a6b327d | 522 | if((c.precision = va_arg(s.ap, int)) < 0) |
460b9539 | 523 | c.flags ^= f_precision; |
524 | /* generate the output */ | |
681cb9fb RK |
525 | if(c.specifier->output(&s, &c) < 0) |
526 | goto error; | |
460b9539 | 527 | } |
6a6b327d | 528 | va_end(s.ap); |
460b9539 | 529 | return s.bytes; |
6a6b327d RK |
530 | error: |
531 | va_end(s.ap); | |
532 | return -1; | |
460b9539 | 533 | } |
534 | ||
681cb9fb RK |
535 | int byte_sinkprintf(struct sink *output, const char *fmt, ...) { |
536 | int n; | |
537 | va_list ap; | |
538 | ||
539 | va_start(ap, fmt); | |
540 | n = byte_vsinkprintf(output, fmt, ap); | |
541 | va_end(ap); | |
542 | return n; | |
543 | } | |
544 | ||
460b9539 | 545 | /* |
546 | Local Variables: | |
547 | c-basic-offset:2 | |
548 | comment-column:40 | |
549 | End: | |
550 | */ |