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/*
* charfuncs.c - Routines for dealing with character streams.
*
* Copyright 2002 Jonathan McDowell <noodles@earth.li>
*
* This program is free software: you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the Free
* Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along with
* this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include "build-config.h"
#include "charfuncs.h"
/*
* Fetches a char from a buffer.
* @ctx: Our buffer context structure.
* @count: The number of characters to get from the buffer.
* @c: Where to put the characters retrieved.
*/
size_t buffer_fetchchar(void *ctx, size_t count, void *c)
{
struct buffer_ctx *buf = NULL;
buf = (struct buffer_ctx *) ctx;
if (buf->offset + count > buf->size) {
count = buf->size - buf->offset;
}
memcpy(c, &buf->buffer[buf->offset], count);
buf->offset += count;
return count;
}
/*
* buffer_putchar - Puts a char to a buffer.
* @ctx: Our buffer context structure.
* @count: The number of characters to put into the buffer.
* @c: The characters to add to the buffer.
*
* Adds characters to the buffer references by the buffer context. If we
* fill it then we double the size of the current buffer and then add the
* rest.
*/
size_t buffer_putchar(void *ctx, size_t count, void *c)
{
struct buffer_ctx *buf = NULL;
size_t newsize = 0;
buf = (struct buffer_ctx *) ctx;
for (newsize = buf->size; newsize < (buf->offset + count);
newsize *= 2) ;
if (newsize != buf->size) {
buf->buffer = realloc(buf->buffer, newsize);
buf->size = newsize;
}
memcpy(&buf->buffer[buf->offset], c, count);
buf->offset += count;
return count;
}
/*
* Fetches a char from a file.
*/
size_t file_fetchchar(void *fd, size_t count, void *c)
{
ssize_t ret = read( *(int *) fd, c, count);
return (ret > 0) ? ret : 0;
}
/*
* Puts a char to a file.
*/
size_t file_putchar(void *fd, size_t count, void *c)
{
size_t ret = write( *(int *) fd, c, count);
return (ret > 0) ? ret : 0;
}
/*
* Gets a char from stdin.
*/
size_t stdin_getchar(__unused void *ctx, size_t count, void *c)
{
return fread(c, 1, count, stdin);
}
/*
* Puts a char to stdout.
*/
size_t stdout_putchar(__unused void *ctx, size_t count, void *c)
{
return fwrite(c, 1, count, stdout);
}
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