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96 lines
2.6 KiB
C
96 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 <sys/types.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <sys/uio.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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const char *g_version_iovec_c = "$Source$: $Revision$\n";
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