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460b9539 | 1 | /* |
2 | * This file is part of DisOrder | |
eb525fcd | 3 | * Copyright (C) 2004, 2007 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 | } | |
98 | if(s->output->write(s->output, buffer, nbytes) < 0) return -1; | |
99 | s->bytes += nbytes; | |
100 | return 0; | |
101 | } | |
102 | ||
103 | /* write character @ch@ @n@ times, reasonably efficiently */ | |
104 | static int do_pad(struct state *s, int ch, unsigned n) { | |
105 | unsigned t; | |
106 | const char *padding; | |
107 | ||
108 | switch(ch) { | |
109 | case ' ': padding = " "; break; | |
110 | case '0': padding = "00000000000000000000000000000000"; break; | |
111 | default: abort(); | |
112 | } | |
113 | t = n / 32; | |
114 | n %= 32; | |
115 | while(t-- > 0) | |
116 | if(do_write(s, padding, 32) < 0) return -1; | |
117 | if(n > 0) | |
118 | if(do_write(s, padding, n) < 0) return -1; | |
119 | return 0; | |
120 | } | |
121 | ||
122 | /* pick up the integer at @ptr@, returning it via @intp@. Return the | |
123 | * number of characters consumed. Return 0 if there is no integer | |
124 | * there and -1 if an error occurred (e.g. too big) */ | |
125 | static int get_integer(int *intp, const char *ptr) { | |
126 | long n; | |
127 | char *e; | |
128 | ||
129 | errno = 0; | |
130 | n = strtol(ptr, &e, 10); | |
131 | if(errno || n > INT_MAX || n < INT_MIN || e == ptr) return -1; | |
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: | |
148 | return 0; | |
149 | default: | |
150 | return -1; | |
151 | } | |
152 | } | |
153 | ||
154 | static int check_string(const struct conversion *c) { | |
155 | switch(c->length) { | |
156 | case 0: | |
157 | /* XXX don't support %ls, %lc */ | |
158 | return 0; | |
159 | default: | |
160 | return -1; | |
161 | } | |
162 | } | |
163 | ||
164 | static int check_pointer(const struct conversion *c) { | |
165 | if(c->length) return -1; | |
166 | return 0; | |
167 | } | |
168 | ||
169 | static int check_percent(const struct conversion *c) { | |
170 | if(c->flags || c->width || c->precision || c->length) return -1; | |
171 | return 0; | |
172 | } | |
173 | ||
174 | /* output functions for various conversion specifications */ | |
175 | ||
176 | static int output_percent(struct state *s, | |
177 | struct conversion attribute((unused)) *c) { | |
178 | return do_write(s, "%", 1); | |
179 | } | |
180 | ||
181 | static int output_integer(struct state *s, struct conversion *c) { | |
182 | uintmax_t u; | |
183 | intmax_t l; | |
184 | char sign; | |
185 | int base, dp, iszero, ndigits, prec, xform, sign_bytes, pad; | |
186 | char digits[CHAR_BIT * sizeof (uintmax_t)]; /* overestimate */ | |
187 | ||
188 | switch(c->specifier->ch) { | |
189 | default: | |
190 | if(c->specifier->base < 0) { | |
191 | switch(c->length) { | |
6a6b327d RK |
192 | case 0: l = va_arg(s->ap, int); break; |
193 | case l_char: l = (signed char)va_arg(s->ap, int); break; | |
194 | case l_short: l = (short)va_arg(s->ap, int); break; | |
195 | case l_long: l = va_arg(s->ap, long); break; | |
196 | case l_longlong: l = va_arg(s->ap, long_long); break; | |
197 | case l_intmax_t: l = va_arg(s->ap, intmax_t); break; | |
198 | case l_size_t: l = va_arg(s->ap, ssize_t); break; | |
199 | case l_ptrdiff_t: l = va_arg(s->ap, ptrdiff_t); break; | |
460b9539 | 200 | default: abort(); |
201 | } | |
202 | base = -c->specifier->base; | |
203 | if(l < 0) { | |
204 | u = -l; | |
205 | sign = '-'; | |
206 | } else { | |
207 | u = l; | |
208 | sign = 0; | |
209 | } | |
210 | } else { | |
211 | switch(c->length) { | |
6a6b327d RK |
212 | case 0: u = va_arg(s->ap, unsigned int); break; |
213 | case l_char: u = (unsigned char)va_arg(s->ap, unsigned int); break; | |
214 | case l_short: u = (unsigned short)va_arg(s->ap, unsigned int); break; | |
215 | case l_long: u = va_arg(s->ap, unsigned long); break; | |
216 | case l_longlong: u = va_arg(s->ap, u_long_long); break; | |
217 | case l_intmax_t: u = va_arg(s->ap, uintmax_t); break; | |
218 | case l_size_t: u = va_arg(s->ap, size_t); break; | |
219 | case l_ptrdiff_t: u = va_arg(s->ap, ptrdiff_t); break; | |
460b9539 | 220 | default: abort(); |
221 | } | |
222 | base = c->specifier->base; | |
223 | sign = 0; | |
224 | } | |
225 | break; | |
226 | case 'p': | |
6a6b327d | 227 | u = (uintptr_t)va_arg(s->ap, void *); |
460b9539 | 228 | c->flags |= f_hash; |
229 | base = c->specifier->base; | |
230 | sign = 0; | |
231 | break; | |
232 | } | |
233 | /* default precision */ | |
234 | if(!(c->flags & f_precision)) | |
235 | c->precision = 1; | |
236 | /* enforce sign */ | |
237 | if((c->flags & f_sign) && !sign) sign = '+'; | |
238 | /* compute the digits */ | |
239 | iszero = (u == 0); | |
240 | dp = sizeof digits; | |
241 | while(u) { | |
242 | digits[--dp] = c->specifier->digits[u % base]; | |
243 | u /= base; | |
244 | } | |
245 | ndigits = sizeof digits - dp; | |
246 | /* alternative form */ | |
247 | if(c->flags & f_hash) { | |
248 | switch(base) { | |
249 | case 8: | |
250 | if((dp == sizeof digits || digits[dp] != '0') | |
251 | && c->precision <= ndigits) | |
252 | c->precision = ndigits + 1; | |
253 | break; | |
254 | } | |
255 | if(!iszero && c->specifier->xform) | |
256 | xform = strlen(c->specifier->xform); | |
257 | else | |
258 | xform = 0; | |
259 | } else | |
260 | xform = 0; | |
261 | /* calculate number of 0s to add for precision */ | |
262 | if(ndigits < c->precision) | |
263 | prec = c->precision - ndigits; | |
264 | else | |
265 | prec = 0; | |
266 | /* bytes occupied by the sign */ | |
267 | if(sign) | |
268 | sign_bytes = 1; | |
269 | else | |
270 | sign_bytes = 0; | |
271 | /* XXX implement the ' ' flag */ | |
272 | /* calculate number of bytes of padding */ | |
273 | if(c->flags & f_width) { | |
274 | if((pad = c->width - (ndigits + prec + xform + sign_bytes)) < 0) | |
275 | pad = 0; | |
276 | } else | |
277 | pad = 0; | |
278 | /* now we are ready to output. Possibilities are: | |
279 | * [space pad][sign][xform][0 prec]digits | |
280 | * [sign][xform][0 pad][0 prec]digits | |
281 | * [sign][xform][0 prec]digits[space pad] | |
282 | * | |
283 | * '-' beats '0'. | |
284 | */ | |
285 | if(c->flags & f_left) { | |
286 | if(pad && do_pad(s, ' ', pad) < 0) return -1; | |
287 | if(sign && do_write(s, &sign, 1)) return -1; | |
288 | if(xform && do_write(s, c->specifier->xform, xform)) return -1; | |
289 | if(prec && do_pad(s, '0', prec) < 0) return -1; | |
290 | if(ndigits && do_write(s, digits + dp, ndigits)) return -1; | |
291 | } else if(c->flags & f_zero) { | |
292 | if(sign && do_write(s, &sign, 1)) return -1; | |
293 | if(xform && do_write(s, c->specifier->xform, xform)) return -1; | |
294 | if(pad && do_pad(s, '0', pad) < 0) return -1; | |
295 | if(prec && do_pad(s, '0', prec) < 0) return -1; | |
296 | if(ndigits && do_write(s, digits + dp, ndigits)) return -1; | |
297 | } else { | |
298 | if(sign && do_write(s, &sign, 1)) return -1; | |
299 | if(xform && do_write(s, c->specifier->xform, xform)) return -1; | |
300 | if(prec && do_pad(s, '0', prec) < 0) return -1; | |
301 | if(ndigits && do_write(s, digits + dp, ndigits)) return -1; | |
302 | if(pad && do_pad(s, ' ', pad) < 0) return -1; | |
303 | } | |
304 | return 0; | |
305 | } | |
306 | ||
307 | static int output_string(struct state *s, struct conversion *c) { | |
308 | const char *str, *n; | |
309 | int pad, len; | |
310 | ||
6a6b327d | 311 | str = va_arg(s->ap, const char *); |
460b9539 | 312 | if(c->flags & f_precision) { |
313 | if((n = memchr(str, 0, c->precision))) | |
314 | len = n - str; | |
315 | else | |
316 | len = c->precision; | |
317 | } else | |
318 | len = strlen(str); | |
319 | if(c->flags & f_width) { | |
320 | if((pad = c->width - len) < 0) | |
321 | pad = 0; | |
322 | } else | |
323 | pad = 0; | |
324 | if(c->flags & f_left) { | |
325 | if(pad && do_pad(s, ' ', pad) < 0) return -1; | |
326 | if(do_write(s, str, len) < 0) return -1; | |
327 | } else { | |
328 | if(do_write(s, str, len) < 0) return -1; | |
329 | if(pad && do_pad(s, ' ', pad) < 0) return -1; | |
330 | } | |
331 | return 0; | |
332 | ||
333 | } | |
334 | ||
335 | static int output_char(struct state *s, struct conversion *c) { | |
336 | int pad; | |
337 | char ch; | |
338 | ||
6a6b327d | 339 | ch = va_arg(s->ap, int); |
460b9539 | 340 | if(c->flags & f_width) { |
341 | if((pad = c->width - 1) < 0) | |
342 | pad = 0; | |
343 | } else | |
344 | pad = 0; | |
345 | if(c->flags & f_left) { | |
346 | if(pad && do_pad(s, ' ', pad) < 0) return -1; | |
347 | if(do_write(s, &ch, 1) < 0) return -1; | |
348 | } else { | |
349 | if(do_write(s, &ch, 1) < 0) return -1; | |
350 | if(pad && do_pad(s, ' ', pad) < 0) return -1; | |
351 | } | |
352 | return 0; | |
353 | } | |
354 | ||
355 | static int output_count(struct state *s, struct conversion *c) { | |
356 | switch(c->length) { | |
6a6b327d RK |
357 | case 0: *va_arg(s->ap, int *) = s->bytes; break; |
358 | case l_char: *va_arg(s->ap, signed char *) = s->bytes; break; | |
359 | case l_short: *va_arg(s->ap, short *) = s->bytes; break; | |
360 | case l_long: *va_arg(s->ap, long *) = s->bytes; break; | |
361 | case l_longlong: *va_arg(s->ap, long_long *) = s->bytes; break; | |
362 | case l_intmax_t: *va_arg(s->ap, intmax_t *) = s->bytes; break; | |
363 | case l_size_t: *va_arg(s->ap, ssize_t *) = s->bytes; break; | |
364 | case l_ptrdiff_t: *va_arg(s->ap, ptrdiff_t *) = s->bytes; break; | |
460b9539 | 365 | default: abort(); |
366 | } | |
367 | return 0; | |
368 | } | |
369 | ||
370 | /* table of conversion specifiers */ | |
371 | static const struct specifier specifiers[] = { | |
372 | /* XXX don't support floating point conversions */ | |
373 | { '%', check_percent, output_percent, 0, 0, 0 }, | |
374 | { 'X', check_integer, output_integer, 16, "0123456789ABCDEF", "0X" }, | |
375 | { 'c', check_string, output_char, 0, 0, 0 }, | |
376 | { 'd', check_integer, output_integer, -10, "0123456789", 0 }, | |
377 | { 'i', check_integer, output_integer, -10, "0123456789", 0 }, | |
378 | { 'n', check_integer, output_count, 0, 0, 0 }, | |
379 | { 'o', check_integer, output_integer, 8, "01234567", 0 }, | |
380 | { 'p', check_pointer, output_integer, 16, "0123456789abcdef", "0x" }, | |
381 | { 's', check_string, output_string, 0, 0, 0 }, | |
382 | { 'u', check_integer, output_integer, 10, "0123456789", 0 }, | |
383 | { 'x', check_integer, output_integer, 16, "0123456789abcdef", "0x" }, | |
384 | }; | |
385 | ||
386 | /* collect and check information about a conversion specification */ | |
387 | static int parse_conversion(struct conversion *c, const char *ptr) { | |
388 | int n, ch, l, r, m; | |
389 | const char *q, *start = ptr; | |
390 | ||
391 | memset(c, 0, sizeof *c); | |
392 | /* flags */ | |
393 | while(*ptr && (q = strchr(flags, *ptr))) { | |
394 | c->flags |= (1 << (q - flags)); | |
395 | ++ptr; | |
396 | } | |
397 | /* minimum field width */ | |
398 | if(*ptr >= '0' && *ptr <= '9') { | |
399 | if((n = get_integer(&c->width, ptr)) < 0) return -1; | |
400 | ptr += n; | |
401 | c->flags |= f_width; | |
402 | } else if(*ptr == '*') { | |
403 | ++ptr; | |
404 | c->width = -1; | |
405 | c->flags |= f_width; | |
406 | } | |
407 | /* precision */ | |
408 | if(*ptr == '.') { | |
409 | ++ptr; | |
410 | if(*ptr >= '0' && *ptr <= '9') { | |
411 | if((n = get_integer(&c->precision, ptr)) < 0) return -1; | |
412 | ptr += n; | |
413 | } else if(*ptr == '*') { | |
414 | ++ptr; | |
415 | c->precision = -1; | |
416 | } else | |
417 | return -1; | |
418 | c->flags |= f_precision; | |
419 | } | |
420 | /* length modifier */ | |
421 | switch(ch = *ptr++) { | |
422 | case 'h': | |
423 | if((ch = *ptr++) == 'h') { c->length = l_char; ch = *ptr++; } | |
424 | else c->length = l_short; | |
425 | break; | |
426 | case 'l': | |
427 | if((ch = *ptr++) == 'l') { c->length = l_longlong; ch = *ptr++; } | |
428 | else c->length = l_long; | |
429 | break; | |
430 | case 'q': c->length = l_longlong; ch = *ptr++; break; | |
431 | case 'j': c->length = l_intmax_t; ch = *ptr++; break; | |
432 | case 'z': c->length = l_size_t; ch = *ptr++; break; | |
433 | case 't': c->length = l_ptrdiff_t; ch = *ptr++; break; | |
434 | case 'L': c->length = l_longdouble; ch = *ptr++; break; | |
435 | } | |
436 | /* conversion specifier */ | |
437 | l = 0; | |
438 | r = sizeof specifiers / sizeof *specifiers; | |
439 | while(l <= r && (specifiers[m = (l + r) / 2].ch != ch)) | |
440 | if(ch < specifiers[m].ch) r = m - 1; | |
441 | else l = m + 1; | |
442 | if(specifiers[m].ch != ch) return -1; | |
443 | if(specifiers[m].check(c)) return -1; | |
444 | c->specifier = &specifiers[m]; | |
445 | return ptr - start; | |
446 | } | |
447 | ||
448 | /* ISO/IEC 9899:1999 7.19.6.1 */ | |
449 | /* http://www.opengroup.org/onlinepubs/009695399/functions/fprintf.html */ | |
450 | ||
451 | int byte_vsinkprintf(struct sink *output, | |
452 | const char *fmt, | |
453 | va_list ap) { | |
454 | int n; | |
455 | const char *ptr; | |
456 | struct state s; | |
457 | struct conversion c; | |
458 | ||
459 | memset(&s, 0, sizeof s); | |
460 | s.output = output; | |
6a6b327d | 461 | va_copy(s.ap,ap); |
460b9539 | 462 | while(*fmt) { |
463 | /* output text up to next conversion specification */ | |
464 | for(ptr = fmt; *fmt && *fmt != '%'; ++fmt) | |
465 | ; | |
466 | if((n = fmt - ptr)) | |
6a6b327d | 467 | if(do_write(&s, ptr, n) < 0) goto error; |
460b9539 | 468 | if(!*fmt) |
469 | break; | |
470 | ++fmt; | |
471 | /* parse conversion */ | |
6a6b327d | 472 | if((n = parse_conversion(&c, fmt)) < 0) goto error; |
460b9539 | 473 | fmt += n; |
474 | /* fill in width and precision */ | |
475 | if((c.flags & f_width) && c.width == -1) | |
6a6b327d | 476 | if((c.width = va_arg(s.ap, int)) < 0) { |
460b9539 | 477 | c.width = -c.width; |
478 | c.flags |= f_left; | |
479 | } | |
480 | if((c.flags & f_precision) && c.precision == -1) | |
6a6b327d | 481 | if((c.precision = va_arg(s.ap, int)) < 0) |
460b9539 | 482 | c.flags ^= f_precision; |
483 | /* generate the output */ | |
6a6b327d | 484 | if(c.specifier->output(&s, &c) < 0) goto error; |
460b9539 | 485 | } |
6a6b327d | 486 | va_end(s.ap); |
460b9539 | 487 | return s.bytes; |
6a6b327d RK |
488 | error: |
489 | va_end(s.ap); | |
490 | return -1; | |
460b9539 | 491 | } |
492 | ||
493 | /* | |
494 | Local Variables: | |
495 | c-basic-offset:2 | |
496 | comment-column:40 | |
497 | End: | |
498 | */ |