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/* See LICENSE file for copyright and license details. */
#ifndef UTIL_H
#define UTIL_H
#include "types-output.h"
#ifndef GCC_ONLY
# if defined(__GNUC__) && !defined(__clang__)
# define GCC_ONLY(...) __VA_ARGS__
# else
# define GCC_ONLY(...) /* nothing */
# endif
#endif
/**
* Duplicate a memory segment
*
* @param src The memory segment, must not be `NULL`
* @param n The size of the memory segment, must not be zero
* @return The duplicate of the memory segment,
* `NULL` on error
*/
GCC_ONLY(__attribute__((__malloc__, __nonnull__)))
void *memdup(const void *restrict src, size_t n);
/**
* Read an entire file
*
* Not cancelled by `EINTR`
*
* @param fd The file descriptor
* @param n Output for the size of the file
* @return The read content, plus a NUL byte at
* the end (not counted in `*n`)
*/
GCC_ONLY(__attribute__((__malloc__)))
void *nread(int fd, size_t *restrict n);
/**
* Write an entire buffer to a file
*
* Not cancelled by `EINTR`
*
* @param fd The file descriptor
* @param buf The buffer which shall be written to the fail
* @param n The size of the buffer
* @return The number of written bytes, less than `n`
* on error, cannot exceed `n`
*/
size_t nwrite(int fd, const void *restrict buf, size_t n);
/**
* Perform a timed suspention of the process.
* The process resumes when the timer expires,
* or when it is interrupted.
*
* @param ms The number of milliseconds to sleep,
* must be less than 1000
*/
void msleep(unsigned ms);
/**
* Check whether a NUL-terminated string is encoded in UTF-8
*
* @param string The string
* @return Zero if good, -1 on encoding error
*/
GCC_ONLY(__attribute__((__pure__, __nonnull__)))
int verify_utf8(const char *restrict string);
/**
* Make identity mapping ramps
*
* @param ramps Output parameter for the ramps
* @param output The output for which the ramps shall be configured
* @return Zero on success, -1 on error
*/
GCC_ONLY(__attribute__((__nonnull__)))
int make_plain_ramps(union gamma_ramps *restrict ramps, struct output *restrict output);
#endif
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