2 Copyright 2001, 2002 Georges Menie (www.menie.org)
3 stdarg version contributed by Christian Ettinger
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU Lesser General Public License as published by
7 the Free Software Foundation; either version 2 of the License, or
8 (at your option) any later version.
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 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public License
16 along with this program; if not, write to the Free Software
17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 putchar is the only external dependency for this file,
22 if you have a working putchar, leave it commented out.
23 If not, uncomment the define below and
24 replace outbyte(c) by your own function call.
26 #define putchar(c) outbyte(c)
31 static void printchar(char **str, int c)
33 extern int putchar(int c);
39 else (void)putchar(c);
45 static int prints(char **out, const char *string, int width, int pad)
47 register int pc = 0, padchar = ' ';
51 register const char *ptr;
52 for (ptr = string; *ptr; ++ptr) ++len;
53 if (len >= width) width = 0;
55 if (pad & PAD_ZERO) padchar = '0';
57 if (!(pad & PAD_RIGHT)) {
58 for ( ; width > 0; --width) {
59 printchar (out, padchar);
63 for ( ; *string ; ++string) {
64 printchar (out, *string);
67 for ( ; width > 0; --width) {
68 printchar (out, padchar);
75 /* the following should be enough for 32 bit int */
76 #define PRINT_BUF_LEN 12
78 static int printi(char **out, int i, int b, int sg, int width, int pad, int letbase)
80 char print_buf[PRINT_BUF_LEN];
82 register int t, neg = 0, pc = 0;
83 register unsigned int u = i;
88 return prints (out, print_buf, width, pad);
91 if (sg && b == 10 && i < 0) {
96 s = print_buf + PRINT_BUF_LEN-1;
102 t += letbase - '0' - 10;
108 if( width && (pad & PAD_ZERO) ) {
109 printchar (out, '-');
118 return pc + prints (out, s, width, pad);
121 static int print( char **out, const char *format, va_list args )
123 register int width, pad;
127 for (; *format != 0; ++format) {
\r
128 if (*format == '%') {
131 if (*format == '\0') break;
132 if (*format == '%') goto out;
133 if (*format == '-') {
137 while (*format == '0') {
141 for ( ; *format >= '0' && *format <= '9'; ++format) {
143 width += *format - '0';
145 if( *format == 's' ) {
146 register char *s = (char *)va_arg( args, int );
147 pc += prints (out, s?s:"(null)", width, pad);
150 if( *format == 'd' ) {
151 pc += printi (out, va_arg( args, int ), 10, 1, width, pad, 'a');
154 if( *format == 'x' ) {
155 pc += printi (out, va_arg( args, int ), 16, 0, width, pad, 'a');
158 if( *format == 'X' ) {
159 pc += printi (out, va_arg( args, int ), 16, 0, width, pad, 'A');
162 if( *format == 'u' ) {
163 pc += printi (out, va_arg( args, int ), 10, 0, width, pad, 'a');
166 if( *format == 'c' ) {
167 /* char are converted to int then pushed on the stack */
168 scr[0] = (char)va_arg( args, int );
170 pc += prints (out, scr, width, pad);
176 printchar (out, *format);
180 if (out) **out = '\0';
185 int printf(const char *format, ...)
189 va_start( args, format );
190 return print( 0, format, args );
193 int sprintf(char *out, const char *format, ...)
197 va_start( args, format );
198 return print( &out, format, args );
202 int snprintf( char *buf, unsigned int count, const char *format, ... )
\r
208 va_start( args, format );
\r
209 return print( &buf, format, args );
\r
216 char *ptr = "Hello world!";
219 unsigned int bs = sizeof(int)*8;
223 mi = (1 << (bs-1)) + 1;
225 printf("printf test\n");
226 printf("%s is null pointer\n", np);
227 printf("%d = 5\n", i);
228 printf("%d = - max int\n", mi);
229 printf("char %c = 'a'\n", 'a');
230 printf("hex %x = ff\n", 0xff);
231 printf("hex %02x = 00\n", 0);
232 printf("signed %d = unsigned %u = hex %x\n", -3, -3, -3);
233 printf("%d %s(s)%", 0, "message");
235 printf("%d %s(s) with %%\n", 0, "message");
236 sprintf(buf, "justif: \"%-10s\"\n", "left"); printf("%s", buf);
237 sprintf(buf, "justif: \"%10s\"\n", "right"); printf("%s", buf);
238 sprintf(buf, " 3: %04d zero padded\n", 3); printf("%s", buf);
239 sprintf(buf, " 3: %-4d left justif.\n", 3); printf("%s", buf);
240 sprintf(buf, " 3: %4d right justif.\n", 3); printf("%s", buf);
241 sprintf(buf, "-3: %04d zero padded\n", -3); printf("%s", buf);
242 sprintf(buf, "-3: %-4d left justif.\n", -3); printf("%s", buf);
243 sprintf(buf, "-3: %4d right justif.\n", -3); printf("%s", buf);
249 * if you compile this file with
250 * gcc -Wall $(YOUR_C_OPTIONS) -DTEST_PRINTF -c printf.c
251 * you will get a normal warning:
252 * printf.c:214: warning: spurious trailing `%' in format
253 * this line is testing an invalid % at the end of the format string.
255 * this should display (on 32bit int machine) :
259 * (null) is null pointer
261 * -2147483647 = - max int
265 * signed -3 = unsigned 4294967293 = hex fffffffd
267 * 0 message(s) with %
270 * 3: 0003 zero padded
273 * -3: -003 zero padded
274 * -3: -3 left justif.
275 * -3: -3 right justif.