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1.14 ! martynas 1: /* $OpenBSD: printf.c,v 1.13 2008/06/19 16:24:00 millert Exp $ */
1.2 deraadt 2:
1.1 deraadt 3: /*
4: * Copyright (c) 1989 The Regents of the University of California.
5: * All rights reserved.
6: *
7: * Redistribution and use in source and binary forms, with or without
8: * modification, are permitted provided that the following conditions
9: * are met:
10: * 1. Redistributions of source code must retain the above copyright
11: * notice, this list of conditions and the following disclaimer.
12: * 2. Redistributions in binary form must reproduce the above copyright
13: * notice, this list of conditions and the following disclaimer in the
14: * documentation and/or other materials provided with the distribution.
1.9 millert 15: * 3. Neither the name of the University nor the names of its contributors
1.1 deraadt 16: * may be used to endorse or promote products derived from this software
17: * without specific prior written permission.
18: *
19: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29: * SUCH DAMAGE.
30: */
31:
32: #ifndef lint
33: #if !defined(SHELL) && !defined(BUILTIN)
34: char copyright[] =
35: "@(#) Copyright (c) 1989 The Regents of the University of California.\n\
36: All rights reserved.\n";
37: #endif
38: #endif /* not lint */
39:
40: #ifndef lint
41: /*static char sccsid[] = "from: @(#)printf.c 5.9 (Berkeley) 6/1/90";*/
1.14 ! martynas 42: static char rcsid[] = "$OpenBSD: printf.c,v 1.13 2008/06/19 16:24:00 millert Exp $";
1.1 deraadt 43: #endif /* not lint */
44:
45: #include <ctype.h>
46: #include <stdio.h>
47: #include <stdlib.h>
48: #include <string.h>
49: #include <limits.h>
50: #include <locale.h>
51: #include <errno.h>
52: #include <err.h>
53:
1.6 millert 54: static int print_escape_str(const char *);
55: static int print_escape(const char *);
1.1 deraadt 56:
1.6 millert 57: static int getchr(void);
58: static double getdouble(void);
59: static int getint(void);
60: static long getlong(void);
61: static unsigned long getulong(void);
62: static char *getstr(void);
63: static char *mklong(const char *, int);
64: static void check_conversion(const char *, const char *);
65: static void usage(void);
1.1 deraadt 66:
67: static int rval;
68: static char **gargv;
69:
70: #define isodigit(c) ((c) >= '0' && (c) <= '7')
71: #define octtobin(c) ((c) - '0')
72: #define hextobin(c) ((c) >= 'A' && (c) <= 'F' ? c - 'A' + 10 : (c) >= 'a' && (c) <= 'f' ? c - 'a' + 10 : c - '0')
73:
74: #ifdef SHELL
75: #define main printfcmd
76: #include "../../bin/sh/bltin/bltin.h"
77: #include <stdarg.h>
78:
79: static void
80: warnx(const char *fmt, ...)
81: {
82:
83: char buf[64];
84: va_list ap;
85:
86: va_start(ap, fmt);
1.8 deraadt 87: vsnprintf(buf, sizeof buf, fmt, ap);
1.1 deraadt 88: va_end(ap);
89:
90: error(buf);
91: }
92: #endif /* SHELL */
93:
94: #define PF(f, func) { \
95: if (fieldwidth) \
96: if (precision) \
97: (void)printf(f, fieldwidth, precision, func); \
98: else \
99: (void)printf(f, fieldwidth, func); \
100: else if (precision) \
101: (void)printf(f, precision, func); \
102: else \
103: (void)printf(f, func); \
104: }
105:
106: int
107: #ifdef BUILTIN
1.10 deraadt 108: progprintf(int argc, char *argv[])
1.1 deraadt 109: #else
1.10 deraadt 110: main(int argc, char *argv[])
1.1 deraadt 111: #endif
112: {
1.5 mpech 113: char *fmt, *start;
114: int fieldwidth, precision;
1.1 deraadt 115: char convch, nextch;
116: char *format;
117:
118: #if !defined(SHELL) && !defined(BUILTIN)
119: setlocale (LC_ALL, "");
120: #endif
1.13 millert 121:
122: /* Need to accept/ignore "--" option. */
123: if (argc > 1 && strcmp(argv[1], "--") == 0) {
124: argc--;
125: argv++;
126: }
1.1 deraadt 127:
1.11 millert 128: if (argc < 2) {
1.1 deraadt 129: usage();
130: return (1);
131: }
132:
1.11 millert 133: format = *++argv;
1.1 deraadt 134: gargv = ++argv;
135:
136: #define SKIP1 "#-+ 0"
137: #define SKIP2 "*0123456789"
138: do {
139: /*
140: * Basic algorithm is to scan the format string for conversion
141: * specifications -- once one is found, find out if the field
142: * width or precision is a '*'; if it is, gather up value.
143: * Note, format strings are reused as necessary to use up the
144: * provided arguments, arguments of zero/null string are
145: * provided to use up the format string.
146: */
147:
148: /* find next format specification */
149: for (fmt = format; *fmt; fmt++) {
150: switch (*fmt) {
151: case '%':
152: start = fmt++;
153:
154: if (*fmt == '%') {
155: putchar ('%');
156: break;
157: } else if (*fmt == 'b') {
158: char *p = getstr();
159: if (print_escape_str(p)) {
160: return (rval);
161: }
162: break;
163: }
164:
165: /* skip to field width */
1.3 millert 166: for (; strchr(SKIP1, *fmt); ++fmt) ;
1.1 deraadt 167: fieldwidth = *fmt == '*' ? getint() : 0;
168:
169: /* skip to possible '.', get following precision */
1.3 millert 170: for (; strchr(SKIP2, *fmt); ++fmt) ;
1.1 deraadt 171: if (*fmt == '.')
172: ++fmt;
173: precision = *fmt == '*' ? getint() : 0;
174:
1.3 millert 175: for (; strchr(SKIP2, *fmt); ++fmt) ;
1.1 deraadt 176: if (!*fmt) {
177: warnx ("missing format character");
178: return(1);
179: }
180:
181: convch = *fmt;
182: nextch = *(fmt + 1);
183: *(fmt + 1) = '\0';
184: switch(convch) {
185: case 'c': {
186: char p = getchr();
187: PF(start, p);
188: break;
189: }
190: case 's': {
191: char *p = getstr();
192: PF(start, p);
193: break;
194: }
195: case 'd':
196: case 'i': {
1.4 deraadt 197: long p;
1.1 deraadt 198: char *f = mklong(start, convch);
1.4 deraadt 199: if (!f) {
200: warnx("out of memory");
201: return (1);
202: }
203: p = getlong();
1.1 deraadt 204: PF(f, p);
205: break;
206: }
207: case 'o':
208: case 'u':
209: case 'x':
210: case 'X': {
1.4 deraadt 211: unsigned long p;
1.1 deraadt 212: char *f = mklong(start, convch);
1.4 deraadt 213: if (!f) {
214: warnx("out of memory");
215: return (1);
216: }
217: p = getulong();
1.1 deraadt 218: PF(f, p);
219: break;
220: }
1.14 ! martynas 221: case 'a':
! 222: case 'A':
1.1 deraadt 223: case 'e':
224: case 'E':
225: case 'f':
1.14 ! martynas 226: case 'F':
1.1 deraadt 227: case 'g':
228: case 'G': {
229: double p = getdouble();
230: PF(start, p);
231: break;
232: }
233: default:
234: warnx ("%s: invalid directive", start);
235: return(1);
236: }
237: *(fmt + 1) = nextch;
238: break;
239:
240: case '\\':
241: fmt += print_escape(fmt);
242: break;
243:
244: default:
245: putchar (*fmt);
246: break;
247: }
248: }
249: } while (gargv > argv && *gargv);
250:
251: return (rval);
252: }
253:
254:
255: /*
256: * Print SysV echo(1) style escape string
257: * Halts processing string and returns 1 if a \c escape is encountered.
258: */
259: static int
1.10 deraadt 260: print_escape_str(const char *str)
1.1 deraadt 261: {
262: int value;
263: int c;
264:
265: while (*str) {
266: if (*str == '\\') {
267: str++;
268: /*
269: * %b string octal constants are not like those in C.
270: * They start with a \0, and are followed by 0, 1, 2,
271: * or 3 octal digits.
272: */
273: if (*str == '0') {
274: str++;
275: for (c = 3, value = 0; c-- && isodigit(*str); str++) {
276: value <<= 3;
277: value += octtobin(*str);
278: }
279: putchar (value);
280: str--;
281: } else if (*str == 'c') {
282: return 1;
283: } else {
284: str--;
285: str += print_escape(str);
286: }
287: } else {
288: putchar (*str);
289: }
290: str++;
291: }
292:
293: return 0;
294: }
295:
296: /*
297: * Print "standard" escape characters
298: */
299: static int
1.10 deraadt 300: print_escape(const char *str)
1.1 deraadt 301: {
302: const char *start = str;
303: int value;
304: int c;
305:
306: str++;
307:
308: switch (*str) {
309: case '0': case '1': case '2': case '3':
310: case '4': case '5': case '6': case '7':
311: for (c = 3, value = 0; c-- && isodigit(*str); str++) {
312: value <<= 3;
313: value += octtobin(*str);
314: }
315: putchar(value);
316: return str - start - 1;
317: /* NOTREACHED */
318:
319: case 'x':
320: str++;
321: for (value = 0; isxdigit(*str); str++) {
322: value <<= 4;
323: value += hextobin(*str);
324: }
325: if (value > UCHAR_MAX) {
326: warnx ("escape sequence out of range for character");
327: rval = 1;
328: }
329: putchar (value);
330: return str - start - 1;
331: /* NOTREACHED */
332:
333: case '\\': /* backslash */
334: putchar('\\');
335: break;
336:
337: case '\'': /* single quote */
338: putchar('\'');
339: break;
340:
341: case '"': /* double quote */
342: putchar('"');
343: break;
344:
345: case 'a': /* alert */
346: putchar('\a');
347: break;
348:
349: case 'b': /* backspace */
350: putchar('\b');
351: break;
352:
353: case 'e': /* escape */
354: #ifdef __GNUC__
355: putchar('\e');
356: #else
357: putchar(033);
358: #endif
359: break;
360:
361: case 'f': /* form-feed */
362: putchar('\f');
363: break;
364:
365: case 'n': /* newline */
366: putchar('\n');
367: break;
368:
369: case 'r': /* carriage-return */
370: putchar('\r');
371: break;
372:
373: case 't': /* tab */
374: putchar('\t');
375: break;
376:
377: case 'v': /* vertical-tab */
378: putchar('\v');
379: break;
380:
381: default:
382: putchar(*str);
383: warnx("unknown escape sequence `\\%c'", *str);
384: rval = 1;
385: }
386:
387: return 1;
388: }
389:
390: static char *
1.10 deraadt 391: mklong(const char *str, int ch)
1.1 deraadt 392: {
1.4 deraadt 393: static char *copy;
394: static int copysize;
1.1 deraadt 395: int len;
396:
397: len = strlen(str) + 2;
1.4 deraadt 398: if (copysize < len) {
399: char *newcopy;
400: copysize = len + 256;
401:
402: newcopy = realloc(copy, copysize);
403: if (newcopy == NULL) {
404: copysize = 0;
405: free(copy);
406: copy = NULL;
407: return (NULL);
408: }
409: copy = newcopy;
410: }
1.1 deraadt 411: (void) memmove(copy, str, len - 3);
412: copy[len - 3] = 'l';
413: copy[len - 2] = ch;
414: copy[len - 1] = '\0';
415: return (copy);
416: }
417:
418: static int
1.10 deraadt 419: getchr(void)
1.1 deraadt 420: {
421: if (!*gargv)
422: return((int)'\0');
423: return((int)**gargv++);
424: }
425:
426: static char *
1.10 deraadt 427: getstr(void)
1.1 deraadt 428: {
429: if (!*gargv)
430: return("");
431: return(*gargv++);
432: }
433:
434: static char *number = "+-.0123456789";
435: static int
1.10 deraadt 436: getint(void)
1.1 deraadt 437: {
438: if (!*gargv)
439: return(0);
440:
1.3 millert 441: if (strchr(number, **gargv))
1.1 deraadt 442: return(atoi(*gargv++));
443:
444: return 0;
445: }
446:
447: static long
1.10 deraadt 448: getlong(void)
1.1 deraadt 449: {
450: long val;
451: char *ep;
452:
453: if (!*gargv)
454: return(0L);
455:
456: if (**gargv == '\"' || **gargv == '\'')
457: return (long) *((*gargv++)+1);
458:
459: errno = 0;
460: val = strtol (*gargv, &ep, 0);
461: check_conversion(*gargv++, ep);
462: return val;
463: }
464:
465: static unsigned long
1.10 deraadt 466: getulong(void)
1.1 deraadt 467: {
468: unsigned long val;
469: char *ep;
470:
471: if (!*gargv)
472: return(0UL);
473:
474: if (**gargv == '\"' || **gargv == '\'')
475: return (unsigned long) *((*gargv++)+1);
476:
477: errno = 0;
478: val = strtoul (*gargv, &ep, 0);
479: check_conversion(*gargv++, ep);
480: return val;
481: }
482:
483: static double
1.10 deraadt 484: getdouble(void)
1.1 deraadt 485: {
486: double val;
487: char *ep;
488:
489: if (!*gargv)
490: return(0.0);
491:
492: if (**gargv == '\"' || **gargv == '\'')
493: return (double) *((*gargv++)+1);
494:
495: errno = 0;
496: val = strtod (*gargv, &ep);
497: check_conversion(*gargv++, ep);
498: return val;
499: }
500:
501: static void
1.10 deraadt 502: check_conversion(const char *s, const char *ep)
1.1 deraadt 503: {
504: if (*ep) {
505: if (ep == s)
506: warnx ("%s: expected numeric value", s);
507: else
508: warnx ("%s: not completely converted", s);
509: rval = 1;
510: } else if (errno == ERANGE) {
511: warnx ("%s: %s", s, strerror(ERANGE));
512: rval = 1;
513: }
514: }
515:
516: static void
1.10 deraadt 517: usage(void)
1.1 deraadt 518: {
519: (void)fprintf(stderr, "usage: printf format [arg ...]\n");
520: }