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93 lines
2.6 KiB
C
93 lines
2.6 KiB
C
/* This software was written by Dirk Engling <erdgeist@erdgeist.org>
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It is considered beerware. Prost. Skol. Cheers or whatever.
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$id$ */
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/* System */
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#include <stdlib.h>
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#include <sys/types.h>
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#include <sys/uio.h>
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#include <unistd.h>
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/* Libowfat */
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/* Opentracker */
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#include "ot_iovec.h"
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void *iovec_increase(int *iovec_entries, struct iovec **iovector, size_t new_alloc) {
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void *new_data;
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int new_entries = 1 + *iovec_entries;
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struct iovec *new_vec = realloc(*iovector, new_entries * sizeof(struct iovec));
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if (!new_vec)
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return NULL;
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/* Only allocate after we have a place to store the pointer */
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new_data = malloc(new_alloc);
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if (!new_data)
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return NULL;
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new_vec[new_entries - 1].iov_base = new_data;
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new_vec[new_entries - 1].iov_len = new_alloc;
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*iovector = new_vec;
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++*iovec_entries;
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return new_data;
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}
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void *iovec_append(int *iovec_entries, struct iovec **iovector, struct iovec *append_iovector) {
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int new_entries = *iovec_entries + 1;
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struct iovec *new_vec = realloc(*iovector, new_entries * sizeof(struct iovec));
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if (!new_vec)
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return NULL;
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/* Take over data from appended iovec */
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new_vec[*iovec_entries].iov_base = append_iovector->iov_base;
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new_vec[*iovec_entries].iov_len = append_iovector->iov_len;
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append_iovector->iov_base = NULL;
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append_iovector->iov_len = 0;
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*iovector = new_vec;
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*iovec_entries = new_entries;
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return new_vec;
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}
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void iovec_free(int *iovec_entries, struct iovec **iovector) {
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int i;
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for (i = 0; i < *iovec_entries; ++i)
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free(((*iovector)[i]).iov_base);
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*iovector = NULL;
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*iovec_entries = 0;
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}
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void iovec_fixlast(int *iovec_entries, struct iovec **iovector, void *last_ptr) {
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if (*iovec_entries) {
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char *base = (char *)((*iovector)[*iovec_entries - 1]).iov_base;
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size_t new_alloc = ((char *)last_ptr) - base;
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((*iovector)[*iovec_entries - 1]).iov_base = realloc(base, new_alloc);
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((*iovector)[*iovec_entries - 1]).iov_len = new_alloc;
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}
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}
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void *iovec_fix_increase_or_free(int *iovec_entries, struct iovec **iovector, void *last_ptr, size_t new_alloc) {
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void *new_data;
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iovec_fixlast(iovec_entries, iovector, last_ptr);
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if (!(new_data = iovec_increase(iovec_entries, iovector, new_alloc)))
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iovec_free(iovec_entries, iovector);
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return new_data;
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}
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size_t iovec_length(const int *iovec_entries, const struct iovec **iovector) {
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size_t length = 0;
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int i;
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for (i = 0; i < *iovec_entries; ++i)
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length += ((*iovector)[i]).iov_len;
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return length;
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}
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