author | Markus Bröker <mbroeker@largo.dyndns.tv> |
Thu, 16 Apr 2009 12:49:13 +0200 | |
changeset 60 | 47c13ca8c4d0 |
parent 58 | 9609c54a54d3 |
child 62 | b7061c0e239f |
permissions | -rw-r--r-- |
58
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myprintf.c added - replaces varargs.c
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1 |
/** |
9609c54a54d3
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* test/demos/myprintf.c |
9609c54a54d3
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3 |
* Copyright (C) 2008 Markus Broeker |
9609c54a54d3
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4 |
*/ |
9609c54a54d3
myprintf.c added - replaces varargs.c
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5 |
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9609c54a54d3
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#include <stdio.h> |
9609c54a54d3
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#include <stdlib.h> |
9609c54a54d3
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#include <stdarg.h> |
9609c54a54d3
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#include <string.h> |
9609c54a54d3
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60 | 11 |
#define BUF_SIZE 1024 |
12 |
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int myprintf (char *fmt, ...) |
9609c54a54d3
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{ |
60 | 15 |
int i, value, pos = 0, size = 1; |
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char c; |
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char *ptr; |
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char *s; |
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char *s_str; |
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char v_str[28]; |
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va_list list; |
9609c54a54d3
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60 | 25 |
if ((s_str = malloc (BUF_SIZE)) == NULL) { |
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return EOF; |
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} |
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28 |
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va_start (list, fmt); |
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9609c54a54d3
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while (*fmt) { |
9609c54a54d3
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switch (*fmt) { |
9609c54a54d3
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case '%': |
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switch (*++fmt) { |
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35 |
case 'c': |
9609c54a54d3
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c = va_arg (list, int); |
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s_str[pos++] = c; |
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break; |
60 | 39 |
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case 's': |
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s = va_arg (list, char *); |
60 | 42 |
while ((pos + strlen (s)) > (size * BUF_SIZE)) { |
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if ((ptr = realloc (s_str, ++size * BUF_SIZE)) == NULL) { |
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s_str[pos] = '\0'; |
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fputs (s_str, stdout); /* print it anyway... */ |
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return EOF; |
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} |
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s_str = ptr; |
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} |
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for (i = 0; i < strlen (s); i++) { |
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s_str[pos++] = s[i]; |
9609c54a54d3
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} |
9609c54a54d3
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break; |
60 | 54 |
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case 'd': |
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value = va_arg (list, int); |
60 | 57 |
sprintf (v_str, "%d", value); |
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for (i = 0; i < strlen (v_str); i++) { |
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s_str[pos++] = v_str[i]; |
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} |
9609c54a54d3
myprintf.c added - replaces varargs.c
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break; |
60 | 62 |
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default: |
60 | 64 |
s_str[pos++] = *fmt; |
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} |
60 | 66 |
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c = *fmt++; |
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default: |
9609c54a54d3
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s_str[pos++] = *fmt++; |
9609c54a54d3
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} |
60 | 71 |
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if (pos > (size * BUF_SIZE / 2)) { |
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if ((ptr = realloc (s_str, ++size * BUF_SIZE)) == NULL) { |
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return EOF; |
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} |
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s_str = ptr; |
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} |
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va_end (list); |
9609c54a54d3
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80 |
} |
9609c54a54d3
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81 |
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s_str[pos] = '\0'; |
60 | 83 |
fputs (s_str, stdout); |
84 |
free (s_str); |
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return pos; |
9609c54a54d3
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} |
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88 |
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int main (int argc, char **argv) |
9609c54a54d3
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90 |
{ |
9609c54a54d3
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int len; |
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60 | 93 |
len = myprintf ("Printf replacement %% [Version %d - %s]...\n", 5, "LSF Rostock"); |
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return EXIT_SUCCESS; |
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} |