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1 | /* |
2 | * Copyright (c) 1989, 1993 | |
3 | * The Regents of the University of California. All rights reserved. | |
4 | * | |
5 | * Redistribution and use in source and binary forms, with or without | |
6 | * modification, are permitted provided that the following conditions | |
7 | * are met: | |
8 | * 1. Redistributions of source code must retain the above copyright | |
9 | * notice, this list of conditions and the following disclaimer. | |
10 | * 2. Redistributions in binary form must reproduce the above copyright | |
11 | * notice, this list of conditions and the following disclaimer in the | |
12 | * documentation and/or other materials provided with the distribution. | |
13 | * 3. All advertising materials mentioning features or use of this software | |
14 | * must display the following acknowledgement: | |
15 | * This product includes software developed by the University of | |
16 | * California, Berkeley and its contributors. | |
17 | * 4. Neither the name of the University nor the names of its contributors | |
18 | * may be used to endorse or promote products derived from this software | |
19 | * without specific prior written permission. | |
20 | * | |
21 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |
22 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
23 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
24 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
25 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
26 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
27 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
28 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
29 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
30 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
31 | * SUCH DAMAGE. | |
32 | */ | |
33 | ||
34 | #if !defined(BUILTIN) && !defined(SHELL) | |
35 | #ifndef lint | |
36 | static char copyright[] = | |
37 | "@(#) Copyright (c) 1989, 1993\n\ | |
38 | The Regents of the University of California. All rights reserved.\n"; | |
39 | #endif /* not lint */ | |
40 | #endif | |
41 | ||
42 | #ifndef lint | |
43 | static char sccsid[] = "@(#)printf.c 8.1 (Berkeley) 7/20/93"; | |
44 | #endif /* not lint */ | |
45 | ||
46 | #include <sys/types.h> | |
47 | ||
48 | #include <errno.h> | |
49 | #include <limits.h> | |
50 | #include <stdio.h> | |
51 | ||
52 | #include "bashansi.h" | |
53 | #include "shell.h" | |
54 | #include "builtins.h" | |
55 | #include "stdc.h" | |
56 | ||
57 | #if !defined (errno) | |
58 | extern int errno; | |
59 | #endif | |
60 | ||
61 | #define PF(f, func) { \ | |
62 | if (fieldwidth) \ | |
63 | if (precision) \ | |
64 | (void)printf(f, fieldwidth, precision, func); \ | |
65 | else \ | |
66 | (void)printf(f, fieldwidth, func); \ | |
67 | else if (precision) \ | |
68 | (void)printf(f, precision, func); \ | |
69 | else \ | |
70 | (void)printf(f, func); \ | |
71 | } | |
72 | ||
73 | static int asciicode __P((void)); | |
74 | static void escape __P((char *)); | |
75 | static int getchr __P((void)); | |
76 | static double getdouble __P((void)); | |
77 | static int getint __P((int *)); | |
78 | static int getlong __P((long *)); | |
79 | static char *getstr __P((void)); | |
80 | static char *mklong __P((char *, int)); | |
81 | static void usage __P((void)); | |
82 | ||
83 | static char **gargv; | |
84 | ||
85 | int printf_builtin (); | |
86 | static int printf_main (); | |
87 | extern char *this_command_name; | |
88 | extern char *single_quote (); | |
89 | extern char **make_builtin_argv (); | |
90 | ||
91 | static char *printf_doc[] = { | |
92 | "printf formats and prints its arguments, after the first, under control", | |
93 | "of the format. The format is a character string which contains three", | |
94 | "types of objects: plain characters, which are simply copied to standard", | |
95 | "output, character escape sequences which are converted and copied to the", | |
96 | "standard output, and format specifications, each of which causes printing", | |
97 | "of the next successive argument. In addition to the standard printf(1)", | |
98 | "formats, %%b means to expand escapes in the corresponding argument, and", | |
99 | "%%q means to quote the argument in a way that can be reused as shell input.", | |
100 | (char *)NULL | |
101 | }; | |
102 | ||
103 | struct builtin printf_struct = { | |
104 | "printf", | |
105 | printf_builtin, | |
106 | BUILTIN_ENABLED, | |
107 | printf_doc, | |
108 | "printf format [arguments]", | |
109 | (char *)0 | |
110 | }; | |
111 | ||
112 | int | |
113 | printf_builtin (list) | |
114 | WORD_LIST *list; | |
115 | { | |
116 | int c, r; | |
117 | char **v; | |
118 | WORD_LIST *l; | |
119 | ||
120 | v = make_builtin_argv (list, &c); | |
121 | r = printf_main (c, v); | |
122 | free (v); | |
123 | fflush(stdout); | |
124 | ||
125 | return r; | |
126 | } | |
127 | ||
128 | static int | |
129 | printf_main(argc, argv) | |
130 | int argc; | |
131 | char *argv[]; | |
132 | { | |
133 | extern int optind; | |
134 | static char *skip1, *skip2; | |
135 | int ch, end, fieldwidth, precision; | |
136 | char convch, nextch, *format, *fmt, *start; | |
137 | ||
138 | while ((ch = getopt(argc, argv, "")) != EOF) | |
139 | switch (ch) { | |
140 | case '?': | |
141 | default: | |
142 | usage(); | |
143 | return (1); | |
144 | } | |
145 | argc -= optind; | |
146 | argv += optind; | |
147 | ||
148 | if (argc < 1) { | |
149 | usage(); | |
150 | return (1); | |
151 | } | |
152 | ||
153 | /* | |
154 | * Basic algorithm is to scan the format string for conversion | |
155 | * specifications -- once one is found, find out if the field | |
156 | * width or precision is a '*'; if it is, gather up value. Note, | |
157 | * format strings are reused as necessary to use up the provided | |
158 | * arguments, arguments of zero/null string are provided to use | |
159 | * up the format string. | |
160 | */ | |
161 | skip1 = "#-+ 0"; | |
162 | skip2 = "*0123456789"; | |
163 | ||
164 | escape(fmt = format = *argv); /* backslash interpretation */ | |
165 | gargv = ++argv; | |
166 | for (;;) { | |
167 | end = 0; | |
168 | /* find next format specification */ | |
169 | next: for (start = fmt;; ++fmt) { | |
170 | if (!*fmt) { | |
171 | /* avoid infinite loop */ | |
172 | if (end == 1) { | |
173 | warnx("missing format character", | |
174 | NULL, NULL); | |
175 | return (1); | |
176 | } | |
177 | end = 1; | |
178 | if (fmt > start) | |
179 | (void)printf("%s", start); | |
180 | if (!*gargv) | |
181 | return (0); | |
182 | fmt = format; | |
183 | goto next; | |
184 | } | |
185 | /* %% prints a % */ | |
186 | if (*fmt == '%') { | |
187 | if (*++fmt != '%') | |
188 | break; | |
189 | *fmt++ = '\0'; | |
190 | (void)printf("%s", start); | |
191 | goto next; | |
192 | } | |
193 | } | |
194 | ||
195 | /* skip to field width */ | |
196 | for (; strchr(skip1, *fmt); ++fmt); | |
197 | if (*fmt == '*') { | |
198 | if (getint(&fieldwidth)) | |
199 | return (1); | |
200 | } else | |
201 | fieldwidth = 0; | |
202 | ||
203 | /* skip to possible '.', get following precision */ | |
204 | for (; strchr(skip2, *fmt); ++fmt); | |
205 | if (*fmt == '.') | |
206 | ++fmt; | |
207 | if (*fmt == '*') { | |
208 | if (getint(&precision)) | |
209 | return (1); | |
210 | } else | |
211 | precision = 0; | |
212 | ||
213 | /* skip to conversion char */ | |
214 | for (; strchr(skip2, *fmt); ++fmt); | |
215 | if (!*fmt) { | |
216 | warnx("missing format character", NULL, NULL); | |
217 | return (1); | |
218 | } | |
219 | ||
220 | convch = *fmt; | |
221 | nextch = *++fmt; | |
222 | *fmt = '\0'; | |
223 | switch(convch) { | |
224 | case 'c': { | |
225 | char p; | |
226 | ||
227 | p = getchr(); | |
228 | PF(start, p); | |
229 | break; | |
230 | } | |
231 | case 's': { | |
232 | char *p; | |
233 | ||
234 | p = getstr(); | |
235 | PF(start, p); | |
236 | break; | |
237 | } | |
238 | case 'b': { /* expand escapes in argument */ | |
239 | char *p; | |
240 | ||
241 | p = getstr(); | |
242 | escape(p); | |
243 | PF("%s", p); | |
244 | break; | |
245 | } | |
246 | case 'q': { /* print with shell single quoting */ | |
247 | char *p, *p2; | |
248 | ||
249 | p = getstr(); | |
250 | p2 = single_quote(p); | |
251 | PF("%s", p2); | |
252 | free(p2); | |
253 | break; | |
254 | } | |
255 | case 'd': case 'i': case 'o': case 'u': case 'x': case 'X': { | |
256 | long p; | |
257 | char *f; | |
258 | ||
259 | if ((f = mklong(start, convch)) == NULL) | |
260 | return (1); | |
261 | if (getlong(&p)) | |
262 | return (1); | |
263 | PF(f, p); | |
264 | break; | |
265 | } | |
266 | case 'e': case 'E': case 'f': case 'g': case 'G': { | |
267 | double p; | |
268 | ||
269 | p = getdouble(); | |
270 | PF(start, p); | |
271 | break; | |
272 | } | |
273 | default: | |
274 | warnx("illegal format character", NULL, NULL); | |
275 | return (1); | |
276 | } | |
277 | *fmt = nextch; | |
278 | } | |
279 | /* NOTREACHED */ | |
280 | } | |
281 | ||
282 | static char * | |
283 | mklong(str, ch) | |
284 | char *str; | |
285 | int ch; | |
286 | { | |
287 | static char copy[64]; | |
288 | int len; | |
289 | ||
290 | len = strlen(str) + 2; | |
291 | memmove(copy, str, len - 3); | |
292 | copy[len - 3] = 'l'; | |
293 | copy[len - 2] = ch; | |
294 | copy[len - 1] = '\0'; | |
295 | return (copy); | |
296 | } | |
297 | ||
298 | static void | |
299 | escape(fmt) | |
300 | register char *fmt; | |
301 | { | |
302 | register char *store; | |
303 | register int value, c; | |
304 | ||
305 | for (store = fmt; c = *fmt; ++fmt, ++store) { | |
306 | if (c != '\\') { | |
307 | *store = c; | |
308 | continue; | |
309 | } | |
310 | switch (*++fmt) { | |
311 | case '\0': /* EOS, user error */ | |
312 | *store = '\\'; | |
313 | *++store = '\0'; | |
314 | return; | |
315 | case '\\': /* backslash */ | |
316 | case '\'': /* single quote */ | |
317 | *store = *fmt; | |
318 | break; | |
319 | case 'a': /* bell/alert */ | |
320 | *store = '\7'; | |
321 | break; | |
322 | case 'b': /* backspace */ | |
323 | *store = '\b'; | |
324 | break; | |
325 | case 'c': | |
326 | return; | |
327 | case 'e': | |
328 | case 'E': | |
329 | *store = '\033'; | |
330 | break; | |
331 | case 'f': /* form-feed */ | |
332 | *store = '\f'; | |
333 | break; | |
334 | case 'n': /* newline */ | |
335 | *store = '\n'; | |
336 | break; | |
337 | case 'r': /* carriage-return */ | |
338 | *store = '\r'; | |
339 | break; | |
340 | case 't': /* horizontal tab */ | |
341 | *store = '\t'; | |
342 | break; | |
343 | case 'v': /* vertical tab */ | |
344 | *store = '\13'; | |
345 | break; | |
346 | /* octal constant */ | |
347 | case '0': case '1': case '2': case '3': | |
348 | case '4': case '5': case '6': case '7': | |
349 | for (c = 3, value = 0; | |
350 | c-- && *fmt >= '0' && *fmt <= '7'; ++fmt) { | |
351 | value <<= 3; | |
352 | value += *fmt - '0'; | |
353 | } | |
354 | --fmt; | |
355 | *store = value; | |
356 | break; | |
357 | default: | |
358 | *store = *fmt; | |
359 | break; | |
360 | } | |
361 | } | |
362 | *store = '\0'; | |
363 | } | |
364 | ||
365 | static int | |
366 | getchr() | |
367 | { | |
368 | if (!*gargv) | |
369 | return ('\0'); | |
370 | return ((int)**gargv++); | |
371 | } | |
372 | ||
373 | static char * | |
374 | getstr() | |
375 | { | |
376 | if (!*gargv) | |
377 | return (""); | |
378 | return (*gargv++); | |
379 | } | |
380 | ||
381 | static char *Number = "+-.0123456789"; | |
382 | static int | |
383 | getint(ip) | |
384 | int *ip; | |
385 | { | |
386 | long val; | |
387 | ||
388 | if (getlong(&val)) | |
389 | return (1); | |
390 | if (val > INT_MAX) { | |
391 | warnx("%s: %s", *gargv, strerror(ERANGE)); | |
392 | return (1); | |
393 | } | |
394 | *ip = val; | |
395 | return (0); | |
396 | } | |
397 | ||
398 | static int | |
399 | getlong(lp) | |
400 | long *lp; | |
401 | { | |
402 | long val; | |
403 | char *ep; | |
404 | ||
405 | if (!*gargv) { | |
406 | *lp = 0; | |
407 | return (0); | |
408 | } | |
409 | if (strchr(Number, **gargv)) { | |
410 | errno = 0; | |
411 | val = strtol(*gargv, &ep, 0); | |
412 | if (*ep != '\0') { | |
413 | warnx("%s: illegal number", *gargv, NULL); | |
414 | return (1); | |
415 | } | |
416 | if (errno == ERANGE) | |
417 | if (val == LONG_MAX) { | |
418 | warnx("%s: %s", *gargv, strerror(ERANGE)); | |
419 | return (1); | |
420 | } | |
421 | if (val == LONG_MIN) { | |
422 | warnx("%s: %s", *gargv, strerror(ERANGE)); | |
423 | return (1); | |
424 | } | |
425 | ||
426 | *lp = val; | |
427 | ++gargv; | |
428 | return (0); | |
429 | } | |
430 | *lp = (long)asciicode(); | |
431 | return (0); | |
432 | } | |
433 | ||
434 | static double | |
435 | getdouble() | |
436 | { | |
437 | if (!*gargv) | |
438 | return ((double)0); | |
439 | if (strchr(Number, **gargv)) | |
440 | return (atof(*gargv++)); | |
441 | return ((double)asciicode()); | |
442 | } | |
443 | ||
444 | static int | |
445 | asciicode() | |
446 | { | |
447 | register int ch; | |
448 | ||
449 | ch = **gargv; | |
450 | if (ch == '\'' || ch == '"') | |
451 | ch = (*gargv)[1]; | |
452 | ++gargv; | |
453 | return (ch); | |
454 | } | |
455 | ||
456 | static void | |
457 | usage() | |
458 | { | |
459 | (void)fprintf(stderr, "usage: printf format [arg ...]\n"); | |
460 | } |