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85 lines
2.3 KiB
C
85 lines
2.3 KiB
C
/* snprinterr.c */
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/* Copyright Gerhard Rieger */
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/* a function similar to vsnprintf() but it just handles %m */
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#include "config.h"
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#include <stddef.h> /* ptrdiff_t */
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#include <ctype.h> /* isdigit() */
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#include <stdarg.h>
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#include <stdlib.h>
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#include <errno.h>
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#if HAVE_SYSLOG_H
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#include <syslog.h>
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#endif
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#include <sys/utsname.h>
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#include <time.h> /* time_t, strftime() */
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#include <sys/time.h> /* gettimeofday() */
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#include <stdio.h>
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#include <string.h>
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#if HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#include "snprinterr.h"
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#define HAVE_STRERROR_R 0
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/* replace %m in format with actual strerror() message, write result to *str.
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keep other % formats unchanged!
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writes at most size chars including the terminating \0 to *str
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returns the number of bytes in the output without terminating \0
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result is always \0 terminated except when size==0
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*/
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int snprinterr(char *str, size_t size, const char *format) {
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char c;
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int full = 0; /* 1 means: there is no space left in * str for more data or \0 */
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int count = 0;
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if (size == 0) return 0;
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if (count >= size) full = 1;
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while (c = *format++) {
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if (c == '%') {
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c = *format++;
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switch (c) {
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case '\0':
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++count; if (!full) { (*str++ = '%'); if (count+1 >= size) full = 1; }
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break;
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default:
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++count; if (!full) { (*str++ = '%'); if (count+1 >= size) full = 1; }
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++count; if (!full) { (*str++ = c); if (count+1 >= size) full = 1; }
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break;
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case 'm':
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{
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#if HAVE_STRERROR_R
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# define BUFLEN 64
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char buf[BUFLEN] = "";
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#endif /* HAVE_STRERROR_R */
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char *bufp;
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#if !HAVE_STRERROR_R
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bufp = strerror(errno);
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#else
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/* there are two versions floating around... */
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# if 1 /* GNU version */
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bufp = strerror_r(errno, buf, BUFLEN);
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# else /* standard version */
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strerror_r(errno, buf, BUFLEN);
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bufp = buf;
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# endif
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#endif /* HAVE_STRERROR_R */
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while ((c = *bufp++) != '\0') {
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++count; if (!full) { (*str++ = c); if (count+1 >= size) full = 1; }
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}
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}
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c = ' '; /* not \0 ! */
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break;
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}
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if (c == '\0') break;
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} else {
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++count; if (!full) { (*str++ = c); if (count+1 >= size) full = 1; }
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}
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}
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*str++ = '\0'; /* always write terminating \0 */
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return count;
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#undef BUFLEN
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}
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