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#include <assert.h>
#include <errno.h>
#include <stdarg.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "eprintf.h"
static char *pname;
// doprintf: print error message
__attribute__((format(printf, 1, 0)))
static void doprintf(const char *fmt, va_list va, int errnum)
{
assert(fmt != NULL);
if (pname != NULL)
fprintf(stderr, "%s: ", pname);
vfprintf(stderr, fmt, va);
if (fmt[0] != '\0' && fmt[strlen(fmt) - 1] == ':')
fprintf(stderr, " %s", strerror(errnum));
fputc('\n', stderr);
}
// eprintf: print error and exit, a trailing : in fmt prints strerror(errno)
void eprintf(const char *fmt, ...)
{
va_list va;
va_start(va, fmt);
doprintf(fmt, va, errno); // TODO: can va_start set errno
va_end(va);
exit(EXIT_FAILURE);
}
// weprintf: print warning, a trailing : in fmt prints strerror(errno)
void weprintf(const char *fmt, ...)
{
va_list va;
va_start(va, fmt);
doprintf(fmt, va, errno); // TODO: Ditto
va_end(va);
}
// estrdup: attempt to strdup a string or exit on error
char *estrdup(const char *s)
{
size_t len;
char *dup;
assert(s != NULL);
len = strlen(s);
if (len == SIZE_MAX)
eprintf("estrdup(\"%.20s\") failed: Too long", s);
dup = malloc(len + 1);
if (dup == NULL)
eprintf("estrdup(\"%.20s\") failed:", s);
strcpy(dup, s);
return dup;
}
// emalloc: attempt to allocate memory or exit on error
void *emalloc(size_t n)
{
void *p;
p = malloc(n);
if (p == NULL)
eprintf("emalloc(%zu) failed:", n);
return p;
}
// ecalloc: attempt to allocate memory or exit on error
void *ecalloc(size_t nmemb, size_t size)
{
void *p;
p = calloc(nmemb, size);
if (p == NULL)
eprintf("ecalloc(%zu, %zu) failed:", nmemb, size);
return p;
}
// erealloc: attempt to reallocate memory or exit on error
void *erealloc(void *p, size_t n)
{
void *r;
r = realloc(p, n);
if (r == NULL)
eprintf("erealloc(%p, %zu) failed:", p, n);
return r;
}
// setprogname: set stored name of program
void setprogname(const char *s)
{
assert(s != NULL);
if (pname != NULL) {
weprintf("setprogname(\"%.20s\") called more than once", s);
return;
}
pname = estrdup(s);
}
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