printf.c revision 1.1.1.2 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 8.2 (Berkeley) 3/22/95";
44 #endif /* not lint */
45
46 #include <sys/types.h>
47
48 #include <err.h>
49 #include <errno.h>
50 #include <limits.h>
51 #ifdef SHELL
52 #define EOF -1
53 #else
54 #include <stdio.h>
55 #endif
56 #include <stdlib.h>
57 #include <string.h>
58
59 /*
60 * XXX
61 * This *has* to go away. TK.
62 */
63 #ifdef SHELL
64 #define main printfcmd
65 #define warnx(a, b, c) { \
66 char buf[64]; \
67 (void)sprintf(buf, sizeof(buf), a, b, c); \
68 error(buf); \
69 }
70 #include "../../bin/sh/bltin/bltin.h"
71 #endif
72
73 #define PF(f, func) { \
74 if (fieldwidth) \
75 if (precision) \
76 (void)printf(f, fieldwidth, precision, func); \
77 else \
78 (void)printf(f, fieldwidth, func); \
79 else if (precision) \
80 (void)printf(f, precision, func); \
81 else \
82 (void)printf(f, func); \
83 }
84
85 static int asciicode __P((void));
86 static void escape __P((char *));
87 static int getchr __P((void));
88 static double getdouble __P((void));
89 static int getint __P((int *));
90 static int getlong __P((long *));
91 static char *getstr __P((void));
92 static char *mklong __P((char *, int));
93 static void usage __P((void));
94
95 static char **gargv;
96
97 int
98 #ifdef BUILTIN
99 progprintf(argc, argv)
100 #else
101 main(argc, argv)
102 #endif
103 int argc;
104 char *argv[];
105 {
106 extern int optind;
107 static char *skip1, *skip2;
108 int ch, end, fieldwidth, precision;
109 char convch, nextch, *format, *fmt, *start;
110
111 while ((ch = getopt(argc, argv, "")) != EOF)
112 switch (ch) {
113 case '?':
114 default:
115 usage();
116 return (1);
117 }
118 argc -= optind;
119 argv += optind;
120
121 if (argc < 1) {
122 usage();
123 return (1);
124 }
125
126 /*
127 * Basic algorithm is to scan the format string for conversion
128 * specifications -- once one is found, find out if the field
129 * width or precision is a '*'; if it is, gather up value. Note,
130 * format strings are reused as necessary to use up the provided
131 * arguments, arguments of zero/null string are provided to use
132 * up the format string.
133 */
134 skip1 = "#-+ 0";
135 skip2 = "*0123456789";
136
137 escape(fmt = format = *argv); /* backslash interpretation */
138 gargv = ++argv;
139 for (;;) {
140 end = 0;
141 /* find next format specification */
142 next: for (start = fmt;; ++fmt) {
143 if (!*fmt) {
144 /* avoid infinite loop */
145 if (end == 1) {
146 warnx("missing format character",
147 NULL, NULL);
148 return (1);
149 }
150 end = 1;
151 if (fmt > start)
152 (void)printf("%s", start);
153 if (!*gargv)
154 return (0);
155 fmt = format;
156 goto next;
157 }
158 /* %% prints a % */
159 if (*fmt == '%') {
160 if (*++fmt != '%')
161 break;
162 *fmt++ = '\0';
163 (void)printf("%s", start);
164 goto next;
165 }
166 }
167
168 /* skip to field width */
169 for (; strchr(skip1, *fmt); ++fmt);
170 if (*fmt == '*') {
171 if (getint(&fieldwidth))
172 return (1);
173 } else
174 fieldwidth = 0;
175
176 /* skip to possible '.', get following precision */
177 for (; strchr(skip2, *fmt); ++fmt);
178 if (*fmt == '.')
179 ++fmt;
180 if (*fmt == '*') {
181 if (getint(&precision))
182 return (1);
183 } else
184 precision = 0;
185
186 /* skip to conversion char */
187 for (; strchr(skip2, *fmt); ++fmt);
188 if (!*fmt) {
189 warnx("missing format character", NULL, NULL);
190 return (1);
191 }
192
193 convch = *fmt;
194 nextch = *++fmt;
195 *fmt = '\0';
196 switch(convch) {
197 case 'c': {
198 char p;
199
200 p = getchr();
201 PF(start, p);
202 break;
203 }
204 case 's': {
205 char *p;
206
207 p = getstr();
208 PF(start, p);
209 break;
210 }
211 case 'd': case 'i': case 'o': case 'u': case 'x': case 'X': {
212 long p;
213 char *f;
214
215 if ((f = mklong(start, convch)) == NULL)
216 return (1);
217 if (getlong(&p))
218 return (1);
219 PF(f, p);
220 break;
221 }
222 case 'e': case 'E': case 'f': case 'g': case 'G': {
223 double p;
224
225 p = getdouble();
226 PF(start, p);
227 break;
228 }
229 default:
230 warnx("illegal format character", NULL, NULL);
231 return (1);
232 }
233 *fmt = nextch;
234 }
235 /* NOTREACHED */
236 }
237
238 static char *
239 mklong(str, ch)
240 char *str;
241 int ch;
242 {
243 static char copy[64];
244 int len;
245
246 len = strlen(str) + 2;
247 memmove(copy, str, len - 3);
248 copy[len - 3] = 'l';
249 copy[len - 2] = ch;
250 copy[len - 1] = '\0';
251 return (copy);
252 }
253
254 static void
255 escape(fmt)
256 register char *fmt;
257 {
258 register char *store;
259 register int value, c;
260
261 for (store = fmt; (c = *fmt) != '\0'; ++fmt, ++store) {
262 if (c != '\\') {
263 *store = c;
264 continue;
265 }
266 switch (*++fmt) {
267 case '\0': /* EOS, user error */
268 *store = '\\';
269 *++store = '\0';
270 return;
271 case '\\': /* backslash */
272 case '\'': /* single quote */
273 *store = *fmt;
274 break;
275 case 'a': /* bell/alert */
276 *store = '\7';
277 break;
278 case 'b': /* backspace */
279 *store = '\b';
280 break;
281 case 'f': /* form-feed */
282 *store = '\f';
283 break;
284 case 'n': /* newline */
285 *store = '\n';
286 break;
287 case 'r': /* carriage-return */
288 *store = '\r';
289 break;
290 case 't': /* horizontal tab */
291 *store = '\t';
292 break;
293 case 'v': /* vertical tab */
294 *store = '\13';
295 break;
296 /* octal constant */
297 case '0': case '1': case '2': case '3':
298 case '4': case '5': case '6': case '7':
299 for (c = 3, value = 0;
300 c-- && *fmt >= '0' && *fmt <= '7'; ++fmt) {
301 value <<= 3;
302 value += *fmt - '0';
303 }
304 --fmt;
305 *store = value;
306 break;
307 default:
308 *store = *fmt;
309 break;
310 }
311 }
312 *store = '\0';
313 }
314
315 static int
316 getchr()
317 {
318 if (!*gargv)
319 return ('\0');
320 return ((int)**gargv++);
321 }
322
323 static char *
324 getstr()
325 {
326 if (!*gargv)
327 return ("");
328 return (*gargv++);
329 }
330
331 static char *Number = "+-.0123456789";
332 static int
333 getint(ip)
334 int *ip;
335 {
336 long val;
337
338 if (getlong(&val))
339 return (1);
340 if (val > INT_MAX) {
341 warnx("%s: %s", *gargv, strerror(ERANGE));
342 return (1);
343 }
344 *ip = val;
345 return (0);
346 }
347
348 static int
349 getlong(lp)
350 long *lp;
351 {
352 long val;
353 char *ep;
354
355 if (!*gargv) {
356 *lp = 0;
357 return (0);
358 }
359 if (strchr(Number, **gargv)) {
360 errno = 0;
361 val = strtol(*gargv, &ep, 0);
362 if (*ep != '\0') {
363 warnx("%s: illegal number", *gargv, NULL);
364 return (1);
365 }
366 if (errno == ERANGE)
367 if (val == LONG_MAX) {
368 warnx("%s: %s", *gargv, strerror(ERANGE));
369 return (1);
370 }
371 if (val == LONG_MIN) {
372 warnx("%s: %s", *gargv, strerror(ERANGE));
373 return (1);
374 }
375
376 *lp = val;
377 ++gargv;
378 return (0);
379 }
380 *lp = (long)asciicode();
381 return (0);
382 }
383
384 static double
385 getdouble()
386 {
387 if (!*gargv)
388 return ((double)0);
389 if (strchr(Number, **gargv))
390 return (atof(*gargv++));
391 return ((double)asciicode());
392 }
393
394 static int
395 asciicode()
396 {
397 register int ch;
398
399 ch = **gargv;
400 if (ch == '\'' || ch == '"')
401 ch = (*gargv)[1];
402 ++gargv;
403 return (ch);
404 }
405
406 static void
407 usage()
408 {
409 (void)fprintf(stderr, "usage: printf format [arg ...]\n");
410 }
411