130 lines
2.4 KiB
C
130 lines
2.4 KiB
C
#include <stdlib.h>
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#include <stdio.h>
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#include <stdarg.h>
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#include <string.h>
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#include "buffer.h"
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/* -------------------------------------------------------------------------- */
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buffer_t
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buffer_new( size_t initial_size )
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{
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buffer_t self;
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if ( (self = calloc(1, sizeof(struct buffer))) != NULL)
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{
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if ( (self->size = initial_size) > 0 )
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{
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if ( !(self->data = calloc( initial_size+1, sizeof(char) )) )
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{
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free(self);
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self = NULL;
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}
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}
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}
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return self;
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}
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/* -------------------------------------------------------------------------- */
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void
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buffer_free( buffer_t self )
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{
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if (self->data)
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free(self->data);
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free(self);
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}
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/* -------------------------------------------------------------------------- */
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size_t
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buffer_add( buffer_t self, const char * data, size_t size )
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{
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size_t result = size+self->size;
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char * ptr;
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if ( (ptr = realloc(self->data, result+1)) != NULL )
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{
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memcpy( &ptr[self->size], data, size );
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ptr[ result ] = 0;
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self->data = ptr;
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self->size = result;
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}
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else
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result = BUFFER_EOB;
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return result;
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}
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/* -------------------------------------------------------------------------- */
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size_t
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buffer_clear( buffer_t self, size_t to_alloc )
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{
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char * data;
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self->size = 0;
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if (to_alloc)
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{
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if ( (data = realloc(self->data, to_alloc)) != NULL )
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{
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self->data = data;
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return to_alloc;
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}
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}
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free(self->data);
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self->data = NULL;
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return 0;
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}
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/* -------------------------------------------------------------------------- */
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size_t
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buffer_shift( buffer_t self, size_t size )
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{
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size_t result;
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if (size && !(size > self->size))
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{
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result = self->size - size;
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memmove(self->data, &self->data[size], result);
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self->size = result;
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}
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else
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result = BUFFER_EOB;
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return result;
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}
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/* -------------------------------------------------------------------------- */
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size_t
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buffer_insert( buffer_t self, size_t offset, const char * data, size_t size )
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{
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size_t result = size + self->size;
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char * ptr;
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if ( (ptr = realloc(self->data, result+1)) != NULL )
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{
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memmove( &ptr[offset+size], &ptr[offset], self->size - offset );
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memcpy( &ptr[offset], data, size );
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ptr[ result ] = 0;
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self->data = ptr;
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self->size = result;
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}
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else
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result = BUFFER_EOB;
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return result;
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}
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/* -------------------------------------------------------------------------- */
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