source: MondoRescue/trunk/mindi-busybox/coreutils/printf.c@ 929

Last change on this file since 929 was 821, checked in by Bruno Cornec, 18 years ago

Addition of busybox 1.2.1 as a mindi-busybox new package
This should avoid delivering binary files in mindi not built there (Fedora and Debian are quite serious about that)
File size: 6.2 KB
Line 
1/* vi: set sw=4 ts=4: */
2/* printf - format and print data
3
4 Copyright 1999 Dave Cinege
5 Portions copyright (C) 1990-1996 Free Software Foundation, Inc.
6
7 Licensed under GPL v2 or later, see file LICENSE in this tarball for details.
8*/
9
10/* Usage: printf format [argument...]
11
12 A front end to the printf function that lets it be used from the shell.
13
14 Backslash escapes:
15
16 \" = double quote
17 \\ = backslash
18 \a = alert (bell)
19 \b = backspace
20 \c = produce no further output
21 \f = form feed
22 \n = new line
23 \r = carriage return
24 \t = horizontal tab
25 \v = vertical tab
26 \0ooo = octal number (ooo is 0 to 3 digits)
27 \xhhh = hexadecimal number (hhh is 1 to 3 digits)
28
29 Additional directive:
30
31 %b = print an argument string, interpreting backslash escapes
32
33 The `format' argument is re-used as many times as necessary
34 to convert all of the given arguments.
35
36 David MacKenzie <djm@gnu.ai.mit.edu> */
37
38
39// 19990508 Busy Boxed! Dave Cinege
40
41#include <unistd.h>
42#include <stdio.h>
43#include <sys/types.h>
44#include <string.h>
45#include <errno.h>
46#include <stdlib.h>
47#include <fcntl.h>
48#include <ctype.h>
49#include <assert.h>
50#include "busybox.h"
51
52static int print_formatted (char *format, int argc, char **argv);
53static void print_direc (char *start, size_t length,
54 int field_width, int precision, char *argument);
55
56typedef int (*converter)(char *arg, void *result);
57static void multiconvert(char *arg, void *result, converter convert)
58{
59 char s[16];
60 if (*arg == '"' || *arg == '\'') {
61 sprintf(s,"%d",(unsigned)*(++arg));
62 arg=s;
63 }
64 if(convert(arg,result)) fprintf(stderr, "%s", arg);
65}
66
67static unsigned long xstrtoul(char *arg)
68{
69 unsigned long result;
70
71 multiconvert(arg,&result, (converter)safe_strtoul);
72 return result;
73}
74
75static long xstrtol(char *arg)
76{
77 long result;
78 multiconvert(arg, &result, (converter)safe_strtol);
79 return result;
80}
81
82static double xstrtod(char *arg)
83{
84 double result;
85 multiconvert(arg, &result, (converter)safe_strtod);
86 return result;
87}
88
89static void print_esc_string(char *str)
90{
91 for (; *str; str++) {
92 if (*str == '\\') {
93 str++;
94 putchar(bb_process_escape_sequence((const char **)&str));
95 } else {
96 putchar(*str);
97 }
98
99 }
100}
101
102int printf_main(int argc, char **argv)
103{
104 char *format;
105 int args_used;
106
107 if (argc <= 1 || **(argv + 1) == '-') {
108 bb_show_usage();
109 }
110
111 format = argv[1];
112 argc -= 2;
113 argv += 2;
114
115 do {
116 args_used = print_formatted(format, argc, argv);
117 argc -= args_used;
118 argv += args_used;
119 }
120 while (args_used > 0 && argc > 0);
121
122/*
123 if (argc > 0)
124 fprintf(stderr, "excess args ignored");
125*/
126
127 return EXIT_SUCCESS;
128}
129
130/* Print the text in FORMAT, using ARGV (with ARGC elements) for
131 arguments to any `%' directives.
132 Return the number of elements of ARGV used. */
133
134static int print_formatted(char *format, int argc, char **argv)
135{
136 int save_argc = argc; /* Preserve original value. */
137 char *f; /* Pointer into `format'. */
138 char *direc_start; /* Start of % directive. */
139 size_t direc_length; /* Length of % directive. */
140 int field_width; /* Arg to first '*', or -1 if none. */
141 int precision; /* Arg to second '*', or -1 if none. */
142
143 for (f = format; *f; ++f) {
144 switch (*f) {
145 case '%':
146 direc_start = f++;
147 direc_length = 1;
148 field_width = precision = -1;
149 if (*f == '%') {
150 putchar('%');
151 break;
152 }
153 if (*f == 'b') {
154 if (argc > 0) {
155 print_esc_string(*argv);
156 ++argv;
157 --argc;
158 }
159 break;
160 }
161 if (strchr("-+ #", *f)) {
162 ++f;
163 ++direc_length;
164 }
165 if (*f == '*') {
166 ++f;
167 ++direc_length;
168 if (argc > 0) {
169 field_width = xstrtoul(*argv);
170 ++argv;
171 --argc;
172 } else
173 field_width = 0;
174 } else
175 while (isdigit(*f)) {
176 ++f;
177 ++direc_length;
178 }
179 if (*f == '.') {
180 ++f;
181 ++direc_length;
182 if (*f == '*') {
183 ++f;
184 ++direc_length;
185 if (argc > 0) {
186 precision = xstrtoul(*argv);
187 ++argv;
188 --argc;
189 } else
190 precision = 0;
191 } else
192 while (isdigit(*f)) {
193 ++f;
194 ++direc_length;
195 }
196 }
197 if (*f == 'l' || *f == 'L' || *f == 'h') {
198 ++f;
199 ++direc_length;
200 }
201 /*
202 if (!strchr ("diouxXfeEgGcs", *f))
203 fprintf(stderr, "%%%c: invalid directive", *f);
204 */
205 ++direc_length;
206 if (argc > 0) {
207 print_direc(direc_start, direc_length, field_width,
208 precision, *argv);
209 ++argv;
210 --argc;
211 } else
212 print_direc(direc_start, direc_length, field_width,
213 precision, "");
214 break;
215
216 case '\\':
217 if (*++f == 'c')
218 exit(0);
219 putchar(bb_process_escape_sequence((const char **)&f));
220 f--;
221 break;
222
223 default:
224 putchar(*f);
225 }
226 }
227
228 return save_argc - argc;
229}
230
231static void
232print_direc(char *start, size_t length, int field_width, int precision,
233 char *argument)
234{
235 char *p; /* Null-terminated copy of % directive. */
236
237 p = xmalloc((unsigned) (length + 1));
238 strncpy(p, start, length);
239 p[length] = 0;
240
241 switch (p[length - 1]) {
242 case 'd':
243 case 'i':
244 if (field_width < 0) {
245 if (precision < 0)
246 printf(p, xstrtol(argument));
247 else
248 printf(p, precision, xstrtol(argument));
249 } else {
250 if (precision < 0)
251 printf(p, field_width, xstrtol(argument));
252 else
253 printf(p, field_width, precision, xstrtol(argument));
254 }
255 break;
256
257 case 'o':
258 case 'u':
259 case 'x':
260 case 'X':
261 if (field_width < 0) {
262 if (precision < 0)
263 printf(p, xstrtoul(argument));
264 else
265 printf(p, precision, xstrtoul(argument));
266 } else {
267 if (precision < 0)
268 printf(p, field_width, xstrtoul(argument));
269 else
270 printf(p, field_width, precision, xstrtoul(argument));
271 }
272 break;
273
274 case 'f':
275 case 'e':
276 case 'E':
277 case 'g':
278 case 'G':
279 if (field_width < 0) {
280 if (precision < 0)
281 printf(p, xstrtod(argument));
282 else
283 printf(p, precision, xstrtod(argument));
284 } else {
285 if (precision < 0)
286 printf(p, field_width, xstrtod(argument));
287 else
288 printf(p, field_width, precision, xstrtod(argument));
289 }
290 break;
291
292 case 'c':
293 printf(p, *argument);
294 break;
295
296 case 's':
297 if (field_width < 0) {
298 if (precision < 0)
299 printf(p, argument);
300 else
301 printf(p, precision, argument);
302 } else {
303 if (precision < 0)
304 printf(p, field_width, argument);
305 else
306 printf(p, field_width, precision, argument);
307 }
308 break;
309 }
310
311 free(p);
312}
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