2 * charfuncs.c - Routines for dealing with character streams.
4 * Copyright 2002 Jonathan McDowell <noodles@earth.li>
6 * This program is free software: you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the Free
8 * Software Foundation; version 2 of the License.
10 * This program is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
15 * You should have received a copy of the GNU General Public License along with
16 * this program. If not, see <https://www.gnu.org/licenses/>.
23 #include "charfuncs.h"
26 * Fetches a char from a buffer.
27 * @ctx: Our buffer context structure.
28 * @count: The number of characters to get from the buffer.
29 * @c: Where to put the characters retrieved.
31 int buffer_fetchchar(void *ctx, size_t count, void *c)
33 struct buffer_ctx *buf = NULL;
35 buf = (struct buffer_ctx *) ctx;
37 if (buf->offset + count > buf->size) {
41 memcpy(c, &buf->buffer[buf->offset], count);
48 * buffer_putchar - Puts a char to a buffer.
49 * @ctx: Our buffer context structure.
50 * @count: The number of characters to put into the buffer.
51 * @c: The characters to add to the buffer.
53 * Adds characters to the buffer references by the buffer context. If we
54 * fill it then we double the size of the current buffer and then add the
57 int buffer_putchar(void *ctx, size_t count, void *c)
59 struct buffer_ctx *buf = NULL;
62 buf = (struct buffer_ctx *) ctx;
64 for (newsize = buf->size; newsize < (buf->offset + count);
67 if (newsize != buf->size) {
68 buf->buffer = realloc(buf->buffer, newsize);
72 memcpy(&buf->buffer[buf->offset], c, count);
79 * Fetches a char from a file.
81 int file_fetchchar(void *fd, size_t count, void *c)
83 return !(read( *(int *) fd, c, count));
87 * Puts a char to a file.
89 int file_putchar(void *fd, size_t count, void *c)
91 return !(write( *(int *) fd, c, count));
95 * Gets a char from stdin.
97 int stdin_getchar(void *ctx, size_t count, void *c)
99 return (fread(c, 1, count, stdin) != count);
103 * Puts a char to stdout.
105 int stdout_putchar(void *ctx, size_t count, void *c)
107 return (fwrite(c, 1, count, stdout) != count);