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1.13 ! millert 1: /* $OpenBSD: printf.c,v 1.12 2004/05/31 15:48:26 pedro 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";*/
1.13 ! millert 42: static char rcsid[] = "$OpenBSD: printf.c,v 1.12 2004/05/31 15:48:26 pedro 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: }
221: case 'e':
222: case 'E':
223: case 'f':
224: case 'g':
225: case 'G': {
226: double p = getdouble();
227: PF(start, p);
228: break;
229: }
230: default:
231: warnx ("%s: invalid directive", start);
232: return(1);
233: }
234: *(fmt + 1) = nextch;
235: break;
236:
237: case '\\':
238: fmt += print_escape(fmt);
239: break;
240:
241: default:
242: putchar (*fmt);
243: break;
244: }
245: }
246: } while (gargv > argv && *gargv);
247:
248: return (rval);
249: }
250:
251:
252: /*
253: * Print SysV echo(1) style escape string
254: * Halts processing string and returns 1 if a \c escape is encountered.
255: */
256: static int
1.10 deraadt 257: print_escape_str(const char *str)
1.1 deraadt 258: {
259: int value;
260: int c;
261:
262: while (*str) {
263: if (*str == '\\') {
264: str++;
265: /*
266: * %b string octal constants are not like those in C.
267: * They start with a \0, and are followed by 0, 1, 2,
268: * or 3 octal digits.
269: */
270: if (*str == '0') {
271: str++;
272: for (c = 3, value = 0; c-- && isodigit(*str); str++) {
273: value <<= 3;
274: value += octtobin(*str);
275: }
276: putchar (value);
277: str--;
278: } else if (*str == 'c') {
279: return 1;
280: } else {
281: str--;
282: str += print_escape(str);
283: }
284: } else {
285: putchar (*str);
286: }
287: str++;
288: }
289:
290: return 0;
291: }
292:
293: /*
294: * Print "standard" escape characters
295: */
296: static int
1.10 deraadt 297: print_escape(const char *str)
1.1 deraadt 298: {
299: const char *start = str;
300: int value;
301: int c;
302:
303: str++;
304:
305: switch (*str) {
306: case '0': case '1': case '2': case '3':
307: case '4': case '5': case '6': case '7':
308: for (c = 3, value = 0; c-- && isodigit(*str); str++) {
309: value <<= 3;
310: value += octtobin(*str);
311: }
312: putchar(value);
313: return str - start - 1;
314: /* NOTREACHED */
315:
316: case 'x':
317: str++;
318: for (value = 0; isxdigit(*str); str++) {
319: value <<= 4;
320: value += hextobin(*str);
321: }
322: if (value > UCHAR_MAX) {
323: warnx ("escape sequence out of range for character");
324: rval = 1;
325: }
326: putchar (value);
327: return str - start - 1;
328: /* NOTREACHED */
329:
330: case '\\': /* backslash */
331: putchar('\\');
332: break;
333:
334: case '\'': /* single quote */
335: putchar('\'');
336: break;
337:
338: case '"': /* double quote */
339: putchar('"');
340: break;
341:
342: case 'a': /* alert */
343: putchar('\a');
344: break;
345:
346: case 'b': /* backspace */
347: putchar('\b');
348: break;
349:
350: case 'e': /* escape */
351: #ifdef __GNUC__
352: putchar('\e');
353: #else
354: putchar(033);
355: #endif
356: break;
357:
358: case 'f': /* form-feed */
359: putchar('\f');
360: break;
361:
362: case 'n': /* newline */
363: putchar('\n');
364: break;
365:
366: case 'r': /* carriage-return */
367: putchar('\r');
368: break;
369:
370: case 't': /* tab */
371: putchar('\t');
372: break;
373:
374: case 'v': /* vertical-tab */
375: putchar('\v');
376: break;
377:
378: default:
379: putchar(*str);
380: warnx("unknown escape sequence `\\%c'", *str);
381: rval = 1;
382: }
383:
384: return 1;
385: }
386:
387: static char *
1.10 deraadt 388: mklong(const char *str, int ch)
1.1 deraadt 389: {
1.4 deraadt 390: static char *copy;
391: static int copysize;
1.1 deraadt 392: int len;
393:
394: len = strlen(str) + 2;
1.4 deraadt 395: if (copysize < len) {
396: char *newcopy;
397: copysize = len + 256;
398:
399: newcopy = realloc(copy, copysize);
400: if (newcopy == NULL) {
401: copysize = 0;
402: free(copy);
403: copy = NULL;
404: return (NULL);
405: }
406: copy = newcopy;
407: }
1.1 deraadt 408: (void) memmove(copy, str, len - 3);
409: copy[len - 3] = 'l';
410: copy[len - 2] = ch;
411: copy[len - 1] = '\0';
412: return (copy);
413: }
414:
415: static int
1.10 deraadt 416: getchr(void)
1.1 deraadt 417: {
418: if (!*gargv)
419: return((int)'\0');
420: return((int)**gargv++);
421: }
422:
423: static char *
1.10 deraadt 424: getstr(void)
1.1 deraadt 425: {
426: if (!*gargv)
427: return("");
428: return(*gargv++);
429: }
430:
431: static char *number = "+-.0123456789";
432: static int
1.10 deraadt 433: getint(void)
1.1 deraadt 434: {
435: if (!*gargv)
436: return(0);
437:
1.3 millert 438: if (strchr(number, **gargv))
1.1 deraadt 439: return(atoi(*gargv++));
440:
441: return 0;
442: }
443:
444: static long
1.10 deraadt 445: getlong(void)
1.1 deraadt 446: {
447: long val;
448: char *ep;
449:
450: if (!*gargv)
451: return(0L);
452:
453: if (**gargv == '\"' || **gargv == '\'')
454: return (long) *((*gargv++)+1);
455:
456: errno = 0;
457: val = strtol (*gargv, &ep, 0);
458: check_conversion(*gargv++, ep);
459: return val;
460: }
461:
462: static unsigned long
1.10 deraadt 463: getulong(void)
1.1 deraadt 464: {
465: unsigned long val;
466: char *ep;
467:
468: if (!*gargv)
469: return(0UL);
470:
471: if (**gargv == '\"' || **gargv == '\'')
472: return (unsigned long) *((*gargv++)+1);
473:
474: errno = 0;
475: val = strtoul (*gargv, &ep, 0);
476: check_conversion(*gargv++, ep);
477: return val;
478: }
479:
480: static double
1.10 deraadt 481: getdouble(void)
1.1 deraadt 482: {
483: double val;
484: char *ep;
485:
486: if (!*gargv)
487: return(0.0);
488:
489: if (**gargv == '\"' || **gargv == '\'')
490: return (double) *((*gargv++)+1);
491:
492: errno = 0;
493: val = strtod (*gargv, &ep);
494: check_conversion(*gargv++, ep);
495: return val;
496: }
497:
498: static void
1.10 deraadt 499: check_conversion(const char *s, const char *ep)
1.1 deraadt 500: {
501: if (*ep) {
502: if (ep == s)
503: warnx ("%s: expected numeric value", s);
504: else
505: warnx ("%s: not completely converted", s);
506: rval = 1;
507: } else if (errno == ERANGE) {
508: warnx ("%s: %s", s, strerror(ERANGE));
509: rval = 1;
510: }
511: }
512:
513: static void
1.10 deraadt 514: usage(void)
1.1 deraadt 515: {
516: (void)fprintf(stderr, "usage: printf format [arg ...]\n");
517: }