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-rw-r--r--busybox/coreutils/printf.c316
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diff --git a/busybox/coreutils/printf.c b/busybox/coreutils/printf.c
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1/* vi: set sw=4 ts=4: */
2/* printf - format and print data
3 Copyright (C) 90, 91, 92, 93, 94, 95, 1996 Free Software Foundation, Inc.
4
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2, or (at your option)
8 any later version.
9
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
14
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software Foundation,
17 Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
18
19/* Usage: printf format [argument...]
20
21 A front end to the printf function that lets it be used from the shell.
22
23 Backslash escapes:
24
25 \" = double quote
26 \\ = backslash
27 \a = alert (bell)
28 \b = backspace
29 \c = produce no further output
30 \f = form feed
31 \n = new line
32 \r = carriage return
33 \t = horizontal tab
34 \v = vertical tab
35 \0ooo = octal number (ooo is 0 to 3 digits)
36 \xhhh = hexadecimal number (hhh is 1 to 3 digits)
37
38 Additional directive:
39
40 %b = print an argument string, interpreting backslash escapes
41
42 The `format' argument is re-used as many times as necessary
43 to convert all of the given arguments.
44
45 David MacKenzie <djm@gnu.ai.mit.edu> */
46
47
48// 19990508 Busy Boxed! Dave Cinege
49
50#include <unistd.h>
51#include <stdio.h>
52#include <sys/types.h>
53#include <string.h>
54#include <errno.h>
55#include <stdlib.h>
56#include <fcntl.h>
57#include <ctype.h>
58#include <assert.h>
59#include "busybox.h"
60
61static double xstrtod __P((char *s));
62static long xstrtol __P((char *s));
63static unsigned long xstrtoul __P((char *s));
64static void print_esc_string __P((char *str));
65static int print_formatted __P((char *format, int argc, char **argv));
66static void print_direc __P( (char *start, size_t length,
67 int field_width, int precision, char *argument));
68
69int printf_main(int argc, char **argv)
70{
71 char *format;
72 int args_used;
73
74 if (argc <= 1 || **(argv + 1) == '-') {
75 bb_show_usage();
76 }
77
78 format = argv[1];
79 argc -= 2;
80 argv += 2;
81
82 do {
83 args_used = print_formatted(format, argc, argv);
84 argc -= args_used;
85 argv += args_used;
86 }
87 while (args_used > 0 && argc > 0);
88
89/*
90 if (argc > 0)
91 fprintf(stderr, "excess args ignored");
92*/
93
94 return EXIT_SUCCESS;
95}
96
97/* Print the text in FORMAT, using ARGV (with ARGC elements) for
98 arguments to any `%' directives.
99 Return the number of elements of ARGV used. */
100
101static int print_formatted(char *format, int argc, char **argv)
102{
103 int save_argc = argc; /* Preserve original value. */
104 char *f; /* Pointer into `format'. */
105 char *direc_start; /* Start of % directive. */
106 size_t direc_length; /* Length of % directive. */
107 int field_width; /* Arg to first '*', or -1 if none. */
108 int precision; /* Arg to second '*', or -1 if none. */
109
110 for (f = format; *f; ++f) {
111 switch (*f) {
112 case '%':
113 direc_start = f++;
114 direc_length = 1;
115 field_width = precision = -1;
116 if (*f == '%') {
117 putchar('%');
118 break;
119 }
120 if (*f == 'b') {
121 if (argc > 0) {
122 print_esc_string(*argv);
123 ++argv;
124 --argc;
125 }
126 break;
127 }
128 if (strchr("-+ #", *f)) {
129 ++f;
130 ++direc_length;
131 }
132 if (*f == '*') {
133 ++f;
134 ++direc_length;
135 if (argc > 0) {
136 field_width = xstrtoul(*argv);
137 ++argv;
138 --argc;
139 } else
140 field_width = 0;
141 } else
142 while (isdigit(*f)) {
143 ++f;
144 ++direc_length;
145 }
146 if (*f == '.') {
147 ++f;
148 ++direc_length;
149 if (*f == '*') {
150 ++f;
151 ++direc_length;
152 if (argc > 0) {
153 precision = xstrtoul(*argv);
154 ++argv;
155 --argc;
156 } else
157 precision = 0;
158 } else
159 while (isdigit(*f)) {
160 ++f;
161 ++direc_length;
162 }
163 }
164 if (*f == 'l' || *f == 'L' || *f == 'h') {
165 ++f;
166 ++direc_length;
167 }
168 /*
169 if (!strchr ("diouxXfeEgGcs", *f))
170 fprintf(stderr, "%%%c: invalid directive", *f);
171 */
172 ++direc_length;
173 if (argc > 0) {
174 print_direc(direc_start, direc_length, field_width,
175 precision, *argv);
176 ++argv;
177 --argc;
178 } else
179 print_direc(direc_start, direc_length, field_width,
180 precision, "");
181 break;
182
183 case '\\':
184 if (*++f == 'c')
185 exit(0);
186 putchar(bb_process_escape_sequence((const char **)&f));
187 f--;
188 break;
189
190 default:
191 putchar(*f);
192 }
193 }
194
195 return save_argc - argc;
196}
197
198static void
199print_direc(char *start, size_t length, int field_width, int precision,
200 char *argument)
201{
202 char *p; /* Null-terminated copy of % directive. */
203
204 p = xmalloc((unsigned) (length + 1));
205 strncpy(p, start, length);
206 p[length] = 0;
207
208 switch (p[length - 1]) {
209 case 'd':
210 case 'i':
211 if (field_width < 0) {
212 if (precision < 0)
213 printf(p, xstrtol(argument));
214 else
215 printf(p, precision, xstrtol(argument));
216 } else {
217 if (precision < 0)
218 printf(p, field_width, xstrtol(argument));
219 else
220 printf(p, field_width, precision, xstrtol(argument));
221 }
222 break;
223
224 case 'o':
225 case 'u':
226 case 'x':
227 case 'X':
228 if (field_width < 0) {
229 if (precision < 0)
230 printf(p, xstrtoul(argument));
231 else
232 printf(p, precision, xstrtoul(argument));
233 } else {
234 if (precision < 0)
235 printf(p, field_width, xstrtoul(argument));
236 else
237 printf(p, field_width, precision, xstrtoul(argument));
238 }
239 break;
240
241 case 'f':
242 case 'e':
243 case 'E':
244 case 'g':
245 case 'G':
246 if (field_width < 0) {
247 if (precision < 0)
248 printf(p, xstrtod(argument));
249 else
250 printf(p, precision, xstrtod(argument));
251 } else {
252 if (precision < 0)
253 printf(p, field_width, xstrtod(argument));
254 else
255 printf(p, field_width, precision, xstrtod(argument));
256 }
257 break;
258
259 case 'c':
260 printf(p, *argument);
261 break;
262
263 case 's':
264 if (field_width < 0) {
265 if (precision < 0)
266 printf(p, argument);
267 else
268 printf(p, precision, argument);
269 } else {
270 if (precision < 0)
271 printf(p, field_width, argument);
272 else
273 printf(p, field_width, precision, argument);
274 }
275 break;
276 }
277
278 free(p);
279}
280
281static unsigned long xstrtoul(char *arg)
282{
283 unsigned long result;
284 if (safe_strtoul(arg, &result))
285 fprintf(stderr, "%s", arg);
286 return result;
287}
288
289static long xstrtol(char *arg)
290{
291 long result;
292 if (safe_strtol(arg, &result))
293 fprintf(stderr, "%s", arg);
294 return result;
295}
296
297static double xstrtod(char *arg)
298{
299 double result;
300 if (safe_strtod(arg, &result))
301 fprintf(stderr, "%s", arg);
302 return result;
303}
304
305static void print_esc_string(char *str)
306{
307 for (; *str; str++) {
308 if (*str == '\\') {
309 str++;
310 putchar(bb_process_escape_sequence((const char **)&str));
311 } else {
312 putchar(*str);
313 }
314
315 }
316}
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