1 /**

     2  * test/demos/myprintf.c

     3  * Copyright (C) 2008 Markus Broeker

     4  */

     5 

     6 #include <stdio.h>

     7 #include <stdlib.h>

     8 #include <stdarg.h>

     9 #include <string.h>

    10 

    11 int myprintf (char *fmt, ...)

    12 {

    13     int i, pos = 0;

    14     va_list list;

    15 

    16     char c;

    17     char *s;

    18     char s_str[1024];

    19 

    20     char v[12];

    21     int value;

    22 

    23     va_start (list, fmt);

    24 

    25     while (*fmt) {

    26         switch (*fmt) {

    27         case '%':

    28             switch (*++fmt) {

    29             case 'c':

    30                 c = va_arg (list, int);

    31                 s_str[pos++] = c;

    32                 c = *fmt++;

    33                 break;

    34             case 's':

    35                 s = va_arg (list, char *);

    36                 for (i = 0; i < strlen (s); i++) {

    37                     s_str[pos++] = s[i];

    38                 }

    39                 c = *fmt++;

    40                 break;

    41             case 'd':

    42                 value = va_arg (list, int);

    43                 sprintf (v, "%d", value);

    44                 for (i = 0; i < strlen (v); i++) {

    45                     s_str[pos++] = v[i];

    46                 }

    47                 c = *fmt++;

    48                 break;

    49             default:

    50                 puts ("Unknown character");

    51             }

    52         default:

    53             s_str[pos++] = *fmt++;

    54         }

    55         va_end (list);

    56     }

    57 

    58     s_str[pos] = '\0';

    59 

    60     puts (s_str);

    61     return pos;

    62 }

    63 

    64 int main (int argc, char **argv)

    65 {

    66     int len;

    67 

    68     len = myprintf ("Bugfix needed: %s\t[%d:%d]", "Lines", 20, 30);

    69     return EXIT_SUCCESS;

    70 }