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#include <errno.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "warnp.h"
static int initialized = 0;
static char * name = NULL;
/* Free the name string. */
static void
done(void)
{
free(name);
name = NULL;
}
/**
* warnp_setprogname(progname):
* Set the program name to be used by warn() and warnx() to ${progname}.
*/
void
warnp_setprogname(const char * progname)
{
const char * p;
/* Free the name if we already have one. */
free(name);
/* Find the last segment of the program name. */
for (p = progname; progname[0] != '\0'; progname++)
if (progname[0] == '/')
p = progname + 1;
/* Copy the name string. */
name = strdup(p);
/* If we haven't already done so, register our exit handler. */
if (initialized == 0) {
atexit(done);
initialized = 1;
}
}
void
warn(const char * fmt, ...)
{
va_list ap;
va_start(ap, fmt);
fprintf(stderr, "%s", (name != NULL) ? name : "(unknown)");
if (fmt != NULL) {
fprintf(stderr, ": ");
vfprintf(stderr, fmt, ap);
}
fprintf(stderr, ": %s\n", strerror(errno));
va_end(ap);
}
void
warnx(const char * fmt, ...)
{
va_list ap;
va_start(ap, fmt);
fprintf(stderr, "%s", (name != NULL) ? name : "(unknown)");
if (fmt != NULL) {
fprintf(stderr, ": ");
vfprintf(stderr, fmt, ap);
}
fprintf(stderr, "\n");
va_end(ap);
}
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