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Dependencies:   FastAnalogIn MODSERIAL PID QEI RPCInterface Servo mbed-rtos mbed telemetry

Fork of Sequential_Timing by EE192 Team 4

printf-stdarg.c@10:716484b1ddb5, 2016-04-05 (annotated)

Committer:
vsutardja
Date:
Tue Apr 05 18:30:41 2016 +0000
Revision:
10:716484b1ddb5
latest

Who changed what in which revision?

UserRevisionLine numberNew contents of line
vsutardja 10:716484b1ddb5 1 /*
vsutardja 10:716484b1ddb5 2 Copyright 2001, 2002 Georges Menie (www.menie.org)
vsutardja 10:716484b1ddb5 3 stdarg version contributed by Christian Ettinger
vsutardja 10:716484b1ddb5 4
vsutardja 10:716484b1ddb5 5 This program is free software; you can redistribute it and/or modify
vsutardja 10:716484b1ddb5 6 it under the terms of the GNU Lesser General Public License as published by
vsutardja 10:716484b1ddb5 7 the Free Software Foundation; either version 2 of the License, or
vsutardja 10:716484b1ddb5 8 (at your option) any later version.
vsutardja 10:716484b1ddb5 9
vsutardja 10:716484b1ddb5 10 This program is distributed in the hope that it will be useful,
vsutardja 10:716484b1ddb5 11 but WITHOUT ANY WARRANTY; without even the implied warranty of
vsutardja 10:716484b1ddb5 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
vsutardja 10:716484b1ddb5 13 GNU Lesser General Public License for more details.
vsutardja 10:716484b1ddb5 14
vsutardja 10:716484b1ddb5 15 You should have received a copy of the GNU Lesser General Public License
vsutardja 10:716484b1ddb5 16 along with this program; if not, write to the Free Software
vsutardja 10:716484b1ddb5 17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
vsutardja 10:716484b1ddb5 18 */
vsutardja 10:716484b1ddb5 19
vsutardja 10:716484b1ddb5 20 /*
vsutardja 10:716484b1ddb5 21 putchar is the only external dependency for this file,
vsutardja 10:716484b1ddb5 22 if you have a working putchar, leave it commented out.
vsutardja 10:716484b1ddb5 23 If not, uncomment the define below and
vsutardja 10:716484b1ddb5 24 replace outbyte(c) by your own function call. */
vsutardja 10:716484b1ddb5 25
vsutardja 10:716484b1ddb5 26 #define putchar(c) putcharNB(c)
vsutardja 10:716484b1ddb5 27
vsutardja 10:716484b1ddb5 28
vsutardja 10:716484b1ddb5 29 #include <stdarg.h>
vsutardja 10:716484b1ddb5 30
vsutardja 10:716484b1ddb5 31 static void printchar(char **str, int c)
vsutardja 10:716484b1ddb5 32 {
vsutardja 10:716484b1ddb5 33 extern int putchar(int c);
vsutardja 10:716484b1ddb5 34
vsutardja 10:716484b1ddb5 35 if (str) {
vsutardja 10:716484b1ddb5 36 **str = c;
vsutardja 10:716484b1ddb5 37 ++(*str);
vsutardja 10:716484b1ddb5 38 }
vsutardja 10:716484b1ddb5 39 else (void)putchar(c);
vsutardja 10:716484b1ddb5 40 }
vsutardja 10:716484b1ddb5 41
vsutardja 10:716484b1ddb5 42 #define PAD_RIGHT 1
vsutardja 10:716484b1ddb5 43 #define PAD_ZERO 2
vsutardja 10:716484b1ddb5 44
vsutardja 10:716484b1ddb5 45 static int prints(char **out, const char *string, int width, int pad)
vsutardja 10:716484b1ddb5 46 {
vsutardja 10:716484b1ddb5 47 register int pc = 0, padchar = ' ';
vsutardja 10:716484b1ddb5 48
vsutardja 10:716484b1ddb5 49 if (width > 0) {
vsutardja 10:716484b1ddb5 50 register int len = 0;
vsutardja 10:716484b1ddb5 51 register const char *ptr;
vsutardja 10:716484b1ddb5 52 for (ptr = string; *ptr; ++ptr) ++len;
vsutardja 10:716484b1ddb5 53 if (len >= width) width = 0;
vsutardja 10:716484b1ddb5 54 else width -= len;
vsutardja 10:716484b1ddb5 55 if (pad & PAD_ZERO) padchar = '0';
vsutardja 10:716484b1ddb5 56 }
vsutardja 10:716484b1ddb5 57 if (!(pad & PAD_RIGHT)) {
vsutardja 10:716484b1ddb5 58 for ( ; width > 0; --width) {
vsutardja 10:716484b1ddb5 59 printchar (out, padchar);
vsutardja 10:716484b1ddb5 60 ++pc;
vsutardja 10:716484b1ddb5 61 }
vsutardja 10:716484b1ddb5 62 }
vsutardja 10:716484b1ddb5 63 for ( ; *string ; ++string) {
vsutardja 10:716484b1ddb5 64 printchar (out, *string);
vsutardja 10:716484b1ddb5 65 ++pc;
vsutardja 10:716484b1ddb5 66 }
vsutardja 10:716484b1ddb5 67 for ( ; width > 0; --width) {
vsutardja 10:716484b1ddb5 68 printchar (out, padchar);
vsutardja 10:716484b1ddb5 69 ++pc;
vsutardja 10:716484b1ddb5 70 }
vsutardja 10:716484b1ddb5 71
vsutardja 10:716484b1ddb5 72 return pc;
vsutardja 10:716484b1ddb5 73 }
vsutardja 10:716484b1ddb5 74
vsutardja 10:716484b1ddb5 75 /* the following should be enough for 32 bit int */
vsutardja 10:716484b1ddb5 76 #define PRINT_BUF_LEN 12
vsutardja 10:716484b1ddb5 77
vsutardja 10:716484b1ddb5 78 static int printi(char **out, int i, int b, int sg, int width, int pad, int letbase)
vsutardja 10:716484b1ddb5 79 {
vsutardja 10:716484b1ddb5 80 char print_buf[PRINT_BUF_LEN];
vsutardja 10:716484b1ddb5 81 register char *s;
vsutardja 10:716484b1ddb5 82 register int t, neg = 0, pc = 0;
vsutardja 10:716484b1ddb5 83 register unsigned int u = i;
vsutardja 10:716484b1ddb5 84
vsutardja 10:716484b1ddb5 85 if (i == 0) {
vsutardja 10:716484b1ddb5 86 print_buf[0] = '0';
vsutardja 10:716484b1ddb5 87 print_buf[1] = '\0';
vsutardja 10:716484b1ddb5 88 return prints (out, print_buf, width, pad);
vsutardja 10:716484b1ddb5 89 }
vsutardja 10:716484b1ddb5 90
vsutardja 10:716484b1ddb5 91 if (sg && b == 10 && i < 0) {
vsutardja 10:716484b1ddb5 92 neg = 1;
vsutardja 10:716484b1ddb5 93 u = -i;
vsutardja 10:716484b1ddb5 94 }
vsutardja 10:716484b1ddb5 95
vsutardja 10:716484b1ddb5 96 s = print_buf + PRINT_BUF_LEN-1;
vsutardja 10:716484b1ddb5 97 *s = '\0';
vsutardja 10:716484b1ddb5 98
vsutardja 10:716484b1ddb5 99 while (u) {
vsutardja 10:716484b1ddb5 100 t = u % b;
vsutardja 10:716484b1ddb5 101 if( t >= 10 )
vsutardja 10:716484b1ddb5 102 t += letbase - '0' - 10;
vsutardja 10:716484b1ddb5 103 *--s = t + '0';
vsutardja 10:716484b1ddb5 104 u /= b;
vsutardja 10:716484b1ddb5 105 }
vsutardja 10:716484b1ddb5 106
vsutardja 10:716484b1ddb5 107 if (neg) {
vsutardja 10:716484b1ddb5 108 if( width && (pad & PAD_ZERO) ) {
vsutardja 10:716484b1ddb5 109 printchar (out, '-');
vsutardja 10:716484b1ddb5 110 ++pc;
vsutardja 10:716484b1ddb5 111 --width;
vsutardja 10:716484b1ddb5 112 }
vsutardja 10:716484b1ddb5 113 else {
vsutardja 10:716484b1ddb5 114 *--s = '-';
vsutardja 10:716484b1ddb5 115 }
vsutardja 10:716484b1ddb5 116 }
vsutardja 10:716484b1ddb5 117
vsutardja 10:716484b1ddb5 118 return pc + prints (out, s, width, pad);
vsutardja 10:716484b1ddb5 119 }
vsutardja 10:716484b1ddb5 120
vsutardja 10:716484b1ddb5 121 static int print(char **out, const char *format, va_list args )
vsutardja 10:716484b1ddb5 122 {
vsutardja 10:716484b1ddb5 123 register int width, pad;
vsutardja 10:716484b1ddb5 124 register int pc = 0;
vsutardja 10:716484b1ddb5 125 char scr[2];
vsutardja 10:716484b1ddb5 126
vsutardja 10:716484b1ddb5 127 for (; *format != 0; ++format) {
vsutardja 10:716484b1ddb5 128 if (*format == '%') {
vsutardja 10:716484b1ddb5 129 ++format;
vsutardja 10:716484b1ddb5 130 width = pad = 0;
vsutardja 10:716484b1ddb5 131 if (*format == '\0') break;
vsutardja 10:716484b1ddb5 132 if (*format == '%') goto out;
vsutardja 10:716484b1ddb5 133 if (*format == '-') {
vsutardja 10:716484b1ddb5 134 ++format;
vsutardja 10:716484b1ddb5 135 pad = PAD_RIGHT;
vsutardja 10:716484b1ddb5 136 }
vsutardja 10:716484b1ddb5 137 while (*format == '0') {
vsutardja 10:716484b1ddb5 138 ++format;
vsutardja 10:716484b1ddb5 139 pad |= PAD_ZERO;
vsutardja 10:716484b1ddb5 140 }
vsutardja 10:716484b1ddb5 141 for ( ; *format >= '0' && *format <= '9'; ++format) {
vsutardja 10:716484b1ddb5 142 width *= 10;
vsutardja 10:716484b1ddb5 143 width += *format - '0';
vsutardja 10:716484b1ddb5 144 }
vsutardja 10:716484b1ddb5 145 if( *format == 's' ) {
vsutardja 10:716484b1ddb5 146 register char *s = (char *)va_arg( args, int );
vsutardja 10:716484b1ddb5 147 pc += prints (out, s?s:"(null)", width, pad);
vsutardja 10:716484b1ddb5 148 continue;
vsutardja 10:716484b1ddb5 149 }
vsutardja 10:716484b1ddb5 150 if( *format == 'd' ) {
vsutardja 10:716484b1ddb5 151 pc += printi (out, va_arg( args, int ), 10, 1, width, pad, 'a');
vsutardja 10:716484b1ddb5 152 continue;
vsutardja 10:716484b1ddb5 153 }
vsutardja 10:716484b1ddb5 154 if( *format == 'x' ) {
vsutardja 10:716484b1ddb5 155 pc += printi (out, va_arg( args, int ), 16, 0, width, pad, 'a');
vsutardja 10:716484b1ddb5 156 continue;
vsutardja 10:716484b1ddb5 157 }
vsutardja 10:716484b1ddb5 158 if( *format == 'X' ) {
vsutardja 10:716484b1ddb5 159 pc += printi (out, va_arg( args, int ), 16, 0, width, pad, 'A');
vsutardja 10:716484b1ddb5 160 continue;
vsutardja 10:716484b1ddb5 161 }
vsutardja 10:716484b1ddb5 162 if( *format == 'u' ) {
vsutardja 10:716484b1ddb5 163 pc += printi (out, va_arg( args, int ), 10, 0, width, pad, 'a');
vsutardja 10:716484b1ddb5 164 continue;
vsutardja 10:716484b1ddb5 165 }
vsutardja 10:716484b1ddb5 166 if( *format == 'c' ) {
vsutardja 10:716484b1ddb5 167 /* char are converted to int then pushed on the stack */
vsutardja 10:716484b1ddb5 168 scr[0] = (char)va_arg( args, int );
vsutardja 10:716484b1ddb5 169 scr[1] = '\0';
vsutardja 10:716484b1ddb5 170 pc += prints (out, scr, width, pad);
vsutardja 10:716484b1ddb5 171 continue;
vsutardja 10:716484b1ddb5 172 }
vsutardja 10:716484b1ddb5 173 }
vsutardja 10:716484b1ddb5 174 else {
vsutardja 10:716484b1ddb5 175 out:
vsutardja 10:716484b1ddb5 176 printchar (out, *format);
vsutardja 10:716484b1ddb5 177 ++pc;
vsutardja 10:716484b1ddb5 178 }
vsutardja 10:716484b1ddb5 179 }
vsutardja 10:716484b1ddb5 180 if (out) **out = '\0';
vsutardja 10:716484b1ddb5 181 va_end( args );
vsutardja 10:716484b1ddb5 182 return pc;
vsutardja 10:716484b1ddb5 183 }
vsutardja 10:716484b1ddb5 184
vsutardja 10:716484b1ddb5 185 int printfNB(const char *format, ...)
vsutardja 10:716484b1ddb5 186 {
vsutardja 10:716484b1ddb5 187 va_list args;
vsutardja 10:716484b1ddb5 188
vsutardja 10:716484b1ddb5 189 va_start( args, format );
vsutardja 10:716484b1ddb5 190 return print( 0, format, args );
vsutardja 10:716484b1ddb5 191 }
vsutardja 10:716484b1ddb5 192
vsutardja 10:716484b1ddb5 193 int sprintf(char *out, const char *format, ...)
vsutardja 10:716484b1ddb5 194 {
vsutardja 10:716484b1ddb5 195 va_list args;
vsutardja 10:716484b1ddb5 196
vsutardja 10:716484b1ddb5 197 va_start( args, format );
vsutardja 10:716484b1ddb5 198 return print( &out, format, args );
vsutardja 10:716484b1ddb5 199 }
vsutardja 10:716484b1ddb5 200
vsutardja 10:716484b1ddb5 201 #ifdef TEST_PRINTF
vsutardja 10:716484b1ddb5 202 int main(void)
vsutardja 10:716484b1ddb5 203 {
vsutardja 10:716484b1ddb5 204 char *ptr = "Hello world!";
vsutardja 10:716484b1ddb5 205 char *np = 0;
vsutardja 10:716484b1ddb5 206 int i = 5;
vsutardja 10:716484b1ddb5 207 unsigned int bs = sizeof(int)*8;
vsutardja 10:716484b1ddb5 208 int mi;
vsutardja 10:716484b1ddb5 209 char buf[80];
vsutardja 10:716484b1ddb5 210
vsutardja 10:716484b1ddb5 211 mi = (1 << (bs-1)) + 1;
vsutardja 10:716484b1ddb5 212 printf("%s\n", ptr);
vsutardja 10:716484b1ddb5 213 printf("printf test\n");
vsutardja 10:716484b1ddb5 214 printf("%s is null pointer\n", np);
vsutardja 10:716484b1ddb5 215 printf("%d = 5\n", i);
vsutardja 10:716484b1ddb5 216 printf("%d = - max int\n", mi);
vsutardja 10:716484b1ddb5 217 printf("char %c = 'a'\n", 'a');
vsutardja 10:716484b1ddb5 218 printf("hex %x = ff\n", 0xff);
vsutardja 10:716484b1ddb5 219 printf("hex %02x = 00\n", 0);
vsutardja 10:716484b1ddb5 220 printf("signed %d = unsigned %u = hex %x\n", -3, -3, -3);
vsutardja 10:716484b1ddb5 221 printf("%d %s(s)%", 0, "message");
vsutardja 10:716484b1ddb5 222 printf("\n");
vsutardja 10:716484b1ddb5 223 printf("%d %s(s) with %%\n", 0, "message");
vsutardja 10:716484b1ddb5 224 sprintf(buf, "justif: \"%-10s\"\n", "left"); printf("%s", buf);
vsutardja 10:716484b1ddb5 225 sprintf(buf, "justif: \"%10s\"\n", "right"); printf("%s", buf);
vsutardja 10:716484b1ddb5 226 sprintf(buf, " 3: %04d zero padded\n", 3); printf("%s", buf);
vsutardja 10:716484b1ddb5 227 sprintf(buf, " 3: %-4d left justif.\n", 3); printf("%s", buf);
vsutardja 10:716484b1ddb5 228 sprintf(buf, " 3: %4d right justif.\n", 3); printf("%s", buf);
vsutardja 10:716484b1ddb5 229 sprintf(buf, "-3: %04d zero padded\n", -3); printf("%s", buf);
vsutardja 10:716484b1ddb5 230 sprintf(buf, "-3: %-4d left justif.\n", -3); printf("%s", buf);
vsutardja 10:716484b1ddb5 231 sprintf(buf, "-3: %4d right justif.\n", -3); printf("%s", buf);
vsutardja 10:716484b1ddb5 232
vsutardja 10:716484b1ddb5 233 return 0;
vsutardja 10:716484b1ddb5 234 }
vsutardja 10:716484b1ddb5 235
vsutardja 10:716484b1ddb5 236 /*
vsutardja 10:716484b1ddb5 237 * if you compile this file with
vsutardja 10:716484b1ddb5 238 * gcc -Wall $(YOUR_C_OPTIONS) -DTEST_PRINTF -c printf.c
vsutardja 10:716484b1ddb5 239 * you will get a normal warning:
vsutardja 10:716484b1ddb5 240 * printf.c:214: warning: spurious trailing `%' in format
vsutardja 10:716484b1ddb5 241 * this line is testing an invalid % at the end of the format string.
vsutardja 10:716484b1ddb5 242 *
vsutardja 10:716484b1ddb5 243 * this should display (on 32bit int machine) :
vsutardja 10:716484b1ddb5 244 *
vsutardja 10:716484b1ddb5 245 * Hello world!
vsutardja 10:716484b1ddb5 246 * printf test
vsutardja 10:716484b1ddb5 247 * (null) is null pointer
vsutardja 10:716484b1ddb5 248 * 5 = 5
vsutardja 10:716484b1ddb5 249 * -2147483647 = - max int
vsutardja 10:716484b1ddb5 250 * char a = 'a'
vsutardja 10:716484b1ddb5 251 * hex ff = ff
vsutardja 10:716484b1ddb5 252 * hex 00 = 00
vsutardja 10:716484b1ddb5 253 * signed -3 = unsigned 4294967293 = hex fffffffd
vsutardja 10:716484b1ddb5 254 * 0 message(s)
vsutardja 10:716484b1ddb5 255 * 0 message(s) with %
vsutardja 10:716484b1ddb5 256 * justif: "left "
vsutardja 10:716484b1ddb5 257 * justif: " right"
vsutardja 10:716484b1ddb5 258 * 3: 0003 zero padded
vsutardja 10:716484b1ddb5 259 * 3: 3 left justif.
vsutardja 10:716484b1ddb5 260 * 3: 3 right justif.
vsutardja 10:716484b1ddb5 261 * -3: -003 zero padded
vsutardja 10:716484b1ddb5 262 * -3: -3 left justif.
vsutardja 10:716484b1ddb5 263 * -3: -3 right justif.
vsutardja 10:716484b1ddb5 264 */
vsutardja 10:716484b1ddb5 265
vsutardja 10:716484b1ddb5 266 #endif