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/* See LICENSE file for copyright and license details. */
#ifndef LIBABORT_H
#define LIBABORT_H
#include <stdarg.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#if defined(__GNUC__)
# if defined(__clang__)
# define LIBABORT_PRINTF__(FMT, ARGS) __attribute__((__format__(__printf__, FMT, ARGS)))
# else
# define LIBABORT_PRINTF__(FMT, ARGS) __attribute__((__format__(__gnu_printf__, FMT, ARGS)))
# endif
# define LIBABORT_NONNULL__(INDEX) __attribute__((__nonnull__(INDEX)))
# define LIBABORT_ALL_NONNULL__ __attribute__((__nonnull__))
# define LIBABORT_PURE__ __attribute__((__pure__))
#else
# define LIBABORT_PRINTF__(FMT, ARGS)
# define LIBABORT_NONNULL__(INDEX)
# define LIBABORT_ALL_NONNULL__
# define LIBABORT_PURE__
#endif
#ifndef LIBABORT_NO_SHORTHANDS
# ifndef stracpy
# define stracpy libabort_stracpy
# endif
# ifndef saprintf
# define saprintf libabort_saprintf
# endif
# ifndef vsaprintf
# define vsaprintf libabort_vsaprintf
# endif
# ifndef stpacpy
# define stpacpy libabort_stpacpy
# endif
# ifndef stracat
# define stracat libabort_stracat
# endif
# ifndef stralen
# define stralen libabort_stralen
# endif
# ifndef stpacat
# define stpacat libabort_stpacat
# endif
#endif
/**
* libabort_stracpy
*
* Copy a string like strncpy(3), but abort if truncation would occur
*
* @param dst The destination buffer
* @param src The source string
* @param size The size of `dst`, in bytes
* @return `dst`
*/
LIBABORT_ALL_NONNULL__
inline char *
libabort_stracpy(char *dst, const char *src, size_t size)
{
size_t i;
for (i = 0; i < size; i++)
if ((dst[i] = src[i]) == '\0')
return dst;
abort();
}
/**
* libabort_stpacpy
*
* Copy a string like stpcpy(3), but abort if truncation would occur.
*
* @param dst The destination buffer
* @param src The source string
* @param size The size of `dst`, in bytes
* @return A pointer to the terminating NUL byte in `dst`
*/
LIBABORT_ALL_NONNULL__
inline char *
libabort_stpacpy(char *dst, const char *src, size_t size)
{
size_t i;
for (i = 0; i < size; i++)
if ((dst[i] = src[i]) == '\0')
return &dst[i];
abort();
}
/**
* libabort_stracat
*
* Concatenate strings like strcat(3), but abort if truncation would occur.
*
* @param dst The destination buffer (must contain a NUL-terminated string)
* @param src The source string
* @param size The size of `dst`, in bytes
* @return `dst`
*/
LIBABORT_ALL_NONNULL__
inline char *
libabort_stracat(char *dst, const char *src, size_t size)
{
size_t i, j;
for (i = 0; i < size; i++)
if (dst[i] == '\0')
break;
if (i == size)
abort();
for (j = 0; i < size; i++, j++)
if ((dst[i] = src[j]) == '\0')
return dst;
abort();
}
/**
* libabort_stralen
*
* Get the length of a string like strlen(3), but abort if no NUL byte is found
* within `size` bytes.
*
* @param str The string
* @param size The maximum number of bytes to examine
* @return The length of the string, excluding the terminating NUL byte
*/
LIBABORT_PURE__
LIBABORT_ALL_NONNULL__
inline size_t
libabort_stralen(const char *str, size_t size)
{
size_t i;
for (i = 0; i < size; i++)
if (!str[i])
return i;
abort();
}
/**
* libabort_stpacat
*
* Concatenate strings like stpcat(3) would (non-standard), but abort if
* truncation would occur.
*
* @param dst The destination buffer (must contain a NUL-terminated string)
* @param src The source string
* @param size The size of `dst`, in bytes
* @return A pointer to the terminating NUL byte in `dst`
*/
LIBABORT_ALL_NONNULL__
inline char *
libabort_stpacat(char *dst, const char *src, size_t size)
{
size_t i, j;
for (i = 0; i < size; i++)
if (dst[i] == '\0')
break;
if (i == size)
abort();
for (j = 0; i < size; i++, j++)
if ((dst[i] = src[j]) == '\0')
return &dst[i];
abort();
}
/**
* libabort_vsaprintf
*
* Format a string like vsnprintf(3), but abort if truncation would occur
*
* @param buf The output buffer
* @param size The size of `buf`, in bytes
* @param fmt The format string
* @param ap The format arguments
* @return The number of bytes written excluding the terminating NUL byte
*
* NB! This function aborts if `size` is 0, use vsnprintf(3) get the size required for `buf`
*/
LIBABORT_NONNULL__(1)
LIBABORT_NONNULL__(3)
LIBABORT_PRINTF__(3, 0)
inline int
libabort_vsaprintf(char *buf, size_t size, const char *fmt, va_list ap)
{
int n = vsnprintf(buf, size, fmt, ap);
if (n < 0 || (size_t)n >= size)
abort();
return n;
}
/**
* libabort_saprintf
*
* Format a string like snprintf(3), but abort if truncation would occur
*
* @param buf The output buffer
* @param size The size of `buf`, in bytes
* @param fmt The format string
* @return The number of bytes written excluding the terminating NUL byte
*
* NB! This function aborts if `size` is 0, use snprintf(3) get the size required for `buf`
*/
LIBABORT_NONNULL__(1)
LIBABORT_NONNULL__(3)
LIBABORT_PRINTF__(3, 4)
inline int
libabort_saprintf(char *buf, size_t size, const char *fmt, ...)
{
va_list ap;
int r;
va_start(ap, fmt);
r = libabort_vsaprintf(buf, size, fmt, ap);
va_end(ap);
return r;
}
#undef LIBABORT_PRINTF__
#undef LIBABORT_NONNULL__
#undef LIBABORT_ALL_NONNULL__
#endif
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