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/* SPDX-License-Identifier: LGPL-2.1-or-later */
#pragma once
#include <stdbool.h>
#include <sys/types.h>
#include <sys/uio.h>
#include "alloc-util.h"
#include "macro.h"
/* An iovec pointing to a single NUL byte */
#define IOVEC_NUL_BYTE (const struct iovec) { \
.iov_base = (void*) (const uint8_t[1]) { 0 }, \
.iov_len = 1, \
}
size_t iovec_total_size(const struct iovec *iovec, size_t n);
bool iovec_increment(struct iovec *iovec, size_t n, size_t k);
/* This accepts both const and non-const pointers */
#define IOVEC_MAKE(base, len) \
(struct iovec) { \
.iov_base = (void*) (base), \
.iov_len = (len), \
}
static inline struct iovec* iovec_make_string(struct iovec *iovec, const char *s) {
assert(iovec);
/* We don't use strlen_ptr() here, because we don't want to include string-util.h for now */
*iovec = IOVEC_MAKE(s, s ? strlen(s) : 0);
return iovec;
}
#define IOVEC_MAKE_STRING(s) \
*iovec_make_string(&(struct iovec) {}, s)
#define CONST_IOVEC_MAKE_STRING(s) \
(const struct iovec) { \
.iov_base = (char*) s, \
.iov_len = STRLEN(s), \
}
static inline void iovec_done(struct iovec *iovec) {
/* A _cleanup_() helper that frees the iov_base in the iovec */
assert(iovec);
iovec->iov_base = mfree(iovec->iov_base);
iovec->iov_len = 0;
}
static inline void iovec_done_erase(struct iovec *iovec) {
assert(iovec);
iovec->iov_base = erase_and_free(iovec->iov_base);
iovec->iov_len = 0;
}
static inline bool iovec_is_set(const struct iovec *iovec) {
/* Checks if the iovec points to a non-empty chunk of memory */
return iovec && iovec->iov_len > 0 && iovec->iov_base;
}
static inline bool iovec_is_valid(const struct iovec *iovec) {
/* Checks if the iovec is either NULL, empty or points to a valid bit of memory */
return !iovec || (iovec->iov_base || iovec->iov_len == 0);
}
char* set_iovec_string_field(struct iovec *iovec, size_t *n_iovec, const char *field, const char *value);
char* set_iovec_string_field_free(struct iovec *iovec, size_t *n_iovec, const char *field, char *value);
void iovec_array_free(struct iovec *iovec, size_t n_iovec);
static inline int iovec_memcmp(const struct iovec *a, const struct iovec *b) {
if (a == b)
return 0;
return memcmp_nn(a ? a->iov_base : NULL,
a ? a->iov_len : 0,
b ? b->iov_base : NULL,
b ? b->iov_len : 0);
}
static inline struct iovec *iovec_memdup(const struct iovec *source, struct iovec *ret) {
assert(ret);
if (!iovec_is_set(source))
*ret = (struct iovec) {};
else {
void *p = memdup(source->iov_base, source->iov_len);
if (!p)
return NULL;
*ret = IOVEC_MAKE(p, source->iov_len);
}
return ret;
}
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