myprintf.c
author Markus Bröker <mbroeker@largo.dyndns.tv>
Tue, 09 Jun 2009 12:43:34 +0200
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/**
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 * myprintf.c
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 * Copyright (C) 2008 Markus Broeker
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 */
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdarg.h>
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#include <string.h>
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#define BUF_SIZE 1024
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int myvfprintf (FILE * fp, const char *fmt, va_list list)
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{
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    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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    if ((s_str = malloc (BUF_SIZE)) == NULL) {
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        return EOF;
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    }
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    while (*fmt) {
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        switch (*fmt) {
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        case '%':
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            switch (*++fmt) {
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            case 'c':
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                c = va_arg (list, int);
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                s_str[pos++] = c;
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                break;
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            case 's':
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                s = va_arg (list, char *);
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                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, fp);  /* print it anyway... */
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                        free (s_str);
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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];
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                }
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                break;
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            case 'd':
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                value = va_arg (list, int);
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                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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                }
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                break;
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            default:
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                s_str[pos++] = *fmt;
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            }
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            c = *fmt++;
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        default:
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            s_str[pos++] = *fmt++;
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        }
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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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                free (s_str);
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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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    }
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    va_end (list);
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    s_str[pos] = '\0';
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    fputs (s_str, fp);
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    free (s_str);
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    return pos;
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}
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int myfprintf (FILE * fp, const char *fmt, ...)
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{
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    va_list list;
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    int ret;
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    va_start (list, fmt);
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    ret = myvfprintf (fp, fmt, list);
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    va_end (list);
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    return ret;
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}
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int myprintf (const char *fmt, ...)
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{
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    va_list list;
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    int ret;
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    va_start (list, fmt);
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    ret = myvfprintf (stdout, fmt, list);
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    va_end (list);
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    return ret;
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}
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int main (int argc, char **argv)
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{
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    int len;
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    len = myprintf ("Printf replacement %% [Version %d - %s]...\n", 5, "LSF Rostock");
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    return EXIT_SUCCESS;
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}