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/*
* No copyright is claimed. This code is in the public domain; do with
* it what you wish.
*
* Authors 2010 Davidlohr Bueso <dave@gnu.org>
* 2010-2025 Karel Zak <kzak@redhat.com>
*
* General memory allocation wrappers for malloc, realloc, calloc and strdup
*/
#ifndef UTIL_LINUX_XALLOC_H
#define UTIL_LINUX_XALLOC_H
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "c.h"
#include "strutils.h"
#ifndef XALLOC_EXIT_CODE
# define XALLOC_EXIT_CODE EXIT_FAILURE
#endif
static inline
__ul_alloc_size(1)
__ul_returns_nonnull
void *xmalloc(const size_t size)
{
void *ret = malloc(size);
if (!ret && size)
err(XALLOC_EXIT_CODE, "cannot allocate %zu bytes", size);
return ret;
}
static inline
__ul_alloc_size(2)
__ul_returns_nonnull
void *xrealloc(void *ptr, const size_t size)
{
void *ret = realloc(ptr, size);
if (!ret && size)
err(XALLOC_EXIT_CODE, "cannot allocate %zu bytes", size);
return ret;
}
static inline
__ul_calloc_size(2, 3)
__ul_returns_nonnull
void *xreallocarray(void *ptr, const size_t nelems, const size_t size)
{
void *ret = reallocarray(ptr, nelems, size);
if (!ret && size && nelems)
err(XALLOC_EXIT_CODE, "cannot allocate %zu bytes", size);
return ret;
}
static inline
__ul_calloc_size(1, 2)
__ul_returns_nonnull
void *xcalloc(const size_t nelems, const size_t size)
{
void *ret = calloc(nelems, size);
if (!ret && size && nelems)
err(XALLOC_EXIT_CODE, "cannot allocate %zu bytes", size);
return ret;
}
static inline
__attribute__((warn_unused_result))
__ul_alloc_size(2)
__ul_returns_nonnull
void *xmemdup(const void *ptr, size_t size)
{
void *ret = xmalloc(size);
memcpy(ret, ptr, size);
return ret;
}
static inline
__attribute__((warn_unused_result))
__ul_returns_nonnull
char *xstrdup(const char *str)
{
char *ret;
assert(str);
ret = strdup(str);
if (!ret)
err(XALLOC_EXIT_CODE, "cannot duplicate string");
return ret;
}
static inline
__attribute__((warn_unused_result))
__ul_returns_nonnull
char *xstrndup(const char *str, size_t size)
{
char *ret;
assert(str);
ret = strndup(str, size);
if (!ret)
err(XALLOC_EXIT_CODE, "cannot duplicate string");
return ret;
}
static inline
__attribute__((__format__(printf, 2, 3)))
int xasprintf(char **strp, const char *fmt, ...)
{
int ret;
va_list args;
va_start(args, fmt);
ret = vasprintf(&(*strp), fmt, args);
va_end(args);
if (ret < 0)
err(XALLOC_EXIT_CODE, "cannot allocate string");
return ret;
}
static inline
__attribute__((__format__(printf, 2, 0)))
int xvasprintf(char **strp, const char *fmt, va_list ap)
{
int ret = vasprintf(&(*strp), fmt, ap);
if (ret < 0)
err(XALLOC_EXIT_CODE, "cannot allocate string");
return ret;
}
static inline void xstrappend(char **a, const char *b)
{
if (ul_strappend(a, b) < 0)
err(XALLOC_EXIT_CODE, "cannot allocate string");
}
static inline void xstrputc(char **a, char c)
{
char b[] = {c, '\0'};
xstrappend(a, b);
}
static inline
__attribute__((__format__(printf, 2, 0)))
int xstrvfappend(char **a, const char *format, va_list ap)
{
int ret = ul_strvfappend(a, format, ap);
if (ret < 0)
err(XALLOC_EXIT_CODE, "cannot allocate string");
return ret;
}
static inline
__attribute__ ((__format__ (__printf__, 2, 3)))
int xstrfappend(char **a, const char *format, ...)
{
va_list ap;
int ret;
va_start(ap, format);
ret = xstrvfappend(a, format, ap);
va_end(ap);
return ret;
}
static inline
__attribute__((warn_unused_result))
char *xgethostname(void)
{
char *name;
size_t sz = get_hostname_max() + 1;
name = xmalloc(sizeof(char) * sz);
if (gethostname(name, sz) != 0) {
free(name);
return NULL;
}
name[sz - 1] = '\0';
return name;
}
static inline
__attribute__((warn_unused_result))
char *xgethosturi(const char *proto)
{
char *n = xgethostname();
char *uri = NULL;
if (!proto)
proto = "file://";
if (!n)
return xstrdup(proto);
xasprintf(&uri, "%s%s", proto, n);
free(n);
return uri;
}
#endif
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