2 * charfuncs.c - Routines for dealing with character streams.
4 * Jonathan McDowell <noodles@earth.li>
6 * Copyright 2002 Project Purple
8 * $Id: charfuncs.c,v 1.4 2003/10/04 10:21:40 noodles Exp $
12 #include <sys/types.h>
16 #include "charfuncs.h"
19 * buffer_fetchchar - Fetches a char from a buffer.
20 * @ctx: Our buffer context structure.
21 * @count: The number of characters to get from the buffer.
22 * @c: Where to put the characters retrieved.
24 int buffer_fetchchar(void *ctx, size_t count, unsigned char *c)
26 struct buffer_ctx *buf = NULL;
29 buf = (struct buffer_ctx *) ctx;
30 for (i = 0; i < count; i++) {
31 c[i] = buf->buffer[buf->offset++];
34 return (((buf->offset) == (buf->size)) ? 1 : 0);
38 * buffer_putchar - Puts a char to a buffer.
39 * @ctx: Our buffer context structure.
40 * @count: The number of characters to put into the buffer.
41 * @c: The characters to add to the buffer.
43 * Adds characters to the buffer references by the buffer context. If we
44 * fill it then we double the size of the current buffer and then add the
47 int buffer_putchar(void *ctx, size_t count, unsigned char *c)
49 struct buffer_ctx *buf = NULL;
53 buf = (struct buffer_ctx *) ctx;
55 for (newsize = buf->size; newsize < (buf->offset + count);
58 if (newsize != buf->size) {
59 buf->buffer = realloc(buf->buffer, newsize);
63 for (i = 0; i < count; i++) {
64 buf->buffer[buf->offset++] = c[i];
71 * file_fetchchar - Fetches a char from a file.
73 int file_fetchchar(void *fd, size_t count, unsigned char *c)
75 return !(read( *(int *) fd, c, count));
79 * file_putchar - Puts a char to a file.
81 int file_putchar(void *fd, size_t count, unsigned char *c)
83 return !(write( *(int *) fd, c, count));
87 * stdin_getchar - Gets a char from stdin.
89 int stdin_getchar(void *ctx, size_t count, unsigned char *c)
91 return (fread(c, 1, count, stdin) != count);
95 * stdout_putchar - Puts a char to stdout.
97 int stdout_putchar(void *ctx, size_t count, unsigned char *c)
99 return (fwrite(c, 1, count, stdout) != count);