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337 lines (309 loc) · 8.91 KB
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/**
* \file input.c
* \brief Generic stdio-like input interface
* \author Abramo Bagnara <abramo@alsa-project.org>
* \date 2000
*
* Generic stdio-like input interface
*/
/*
* Input object
* Copyright (c) 2000 by Abramo Bagnara <abramo@alsa-project.org>
*
*
* This library is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
*/
#include "local.h"
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#ifndef DOC_HIDDEN
typedef struct _snd_input_ops {
int (*close)(snd_input_t *input);
int (*scan)(snd_input_t *input, const char *format, va_list args);
char *(*(gets))(snd_input_t *input, char *str, size_t size);
int (*getch)(snd_input_t *input);
int (*ungetch)(snd_input_t *input, int c);
} snd_input_ops_t;
struct _snd_input {
snd_input_type_t type;
const snd_input_ops_t *ops;
void *private_data;
};
#endif
/**
* \brief Closes an input handle.
* \param input The input handle to be closed.
* \return Zero if successful, otherwise a negative error code.
*/
int snd_input_close(snd_input_t *input)
{
int err = input->ops->close(input);
free(input);
return err;
}
/**
* \brief Reads formatted input (like \c fscanf(3)) from an input handle.
* \param input The input handle.
* \param format Format string in \c fscanf format.
* \param ... Other \c fscanf arguments.
* \return The number of input items assigned, or \c EOF.
*
* \bug Reading from a memory buffer doesn't work.
*/
int snd_input_scanf(snd_input_t *input, const char *format, ...)
{
int result;
va_list args;
va_start(args, format);
result = input->ops->scan(input, format, args);
va_end(args);
return result;
}
/**
* \brief Reads a line from an input handle (like \c fgets(3)).
* \param input The input handle.
* \param str Address of the destination buffer.
* \param size The size of the destination buffer.
* \return Pointer to the buffer if successful, otherwise \c NULL.
*
* Like \c fgets, the returned string is zero-terminated, and contains
* the new-line character \c '\\n' if the line fits into the buffer.
*/
char *snd_input_gets(snd_input_t *input, char *str, size_t size)
{
return (input->ops->gets)(input, str, size);
}
/**
* \brief Reads a character from an input handle (like \c fgetc(3)).
* \param input The input handle.
* \return The character read, or \c EOF on end of file or error.
*/
int snd_input_getc(snd_input_t *input)
{
return input->ops->getch(input);
}
/**
* \brief Puts the last character read back to an input handle (like \c ungetc(3)).
* \param input The input handle.
* \param c The character to push back.
* \return The character pushed back, or \c EOF on error.
*/
int snd_input_ungetc(snd_input_t *input, int c)
{
return input->ops->ungetch(input, c);
}
#ifndef DOC_HIDDEN
typedef struct _snd_input_stdio {
int close;
FILE *fp;
} snd_input_stdio_t;
static int snd_input_stdio_close(snd_input_t *input ATTRIBUTE_UNUSED)
{
snd_input_stdio_t *stdio = input->private_data;
if (stdio->close)
fclose(stdio->fp);
free(stdio);
return 0;
}
static int snd_input_stdio_scan(snd_input_t *input, const char *format, va_list args)
{
snd_input_stdio_t *stdio = input->private_data;
extern int vfscanf(FILE *, const char *, va_list);
return vfscanf(stdio->fp, format, args);
}
static char *snd_input_stdio_gets(snd_input_t *input, char *str, size_t size)
{
snd_input_stdio_t *stdio = input->private_data;
return fgets(str, (int) size, stdio->fp);
}
static int snd_input_stdio_getc(snd_input_t *input)
{
snd_input_stdio_t *stdio = input->private_data;
return getc(stdio->fp);
}
static int snd_input_stdio_ungetc(snd_input_t *input, int c)
{
snd_input_stdio_t *stdio = input->private_data;
return ungetc(c, stdio->fp);
}
static const snd_input_ops_t snd_input_stdio_ops = {
.close = snd_input_stdio_close,
.scan = snd_input_stdio_scan,
.gets = snd_input_stdio_gets,
.getch = snd_input_stdio_getc,
.ungetch = snd_input_stdio_ungetc,
};
#endif
/**
* \brief Creates a new input object using an existing stdio \c FILE pointer.
* \param inputp The function puts the pointer to the new input object
* at the address specified by \p inputp.
* \param fp The \c FILE pointer to read from.
* Reading begins at the current file position.
* \param _close Close flag. Set this to 1 if #snd_input_close should close
* \p fp by calling \c fclose.
* \return Zero if successful, otherwise a negative error code.
*/
int snd_input_stdio_attach(snd_input_t **inputp, FILE *fp, int _close)
{
snd_input_t *input;
snd_input_stdio_t *stdio;
assert(inputp && fp);
stdio = calloc(1, sizeof(*stdio));
if (!stdio)
return -ENOMEM;
input = calloc(1, sizeof(*input));
if (!input) {
free(stdio);
return -ENOMEM;
}
stdio->fp = fp;
stdio->close = _close;
input->type = SND_INPUT_STDIO;
input->ops = &snd_input_stdio_ops;
input->private_data = stdio;
*inputp = input;
return 0;
}
/**
* \brief Creates a new input object reading from a file.
* \param inputp The functions puts the pointer to the new input object
* at the address specified by \p inputp.
* \param file The name of the file to read from.
* \param mode The open mode, like \c fopen(3).
* \return Zero if successful, otherwise a negative error code.
*/
int snd_input_stdio_open(snd_input_t **inputp, const char *file, const char *mode)
{
int err;
FILE *fp = fopen(file, mode);
if (!fp) {
//SYSERR("fopen");
return -errno;
}
err = snd_input_stdio_attach(inputp, fp, 1);
if (err < 0)
fclose(fp);
return err;
}
#ifndef DOC_HIDDEN
typedef struct _snd_input_buffer {
unsigned char *buf;
unsigned char *ptr;
size_t size;
} snd_input_buffer_t;
static int snd_input_buffer_close(snd_input_t *input)
{
snd_input_buffer_t *buffer = input->private_data;
free(buffer->buf);
free(buffer);
return 0;
}
static int snd_input_buffer_scan(snd_input_t *input, const char *format, va_list args)
{
snd_input_buffer_t *buffer = input->private_data;
extern int vsscanf(const char *, const char *, va_list);
/* FIXME: how can I obtain consumed chars count? */
assert(0);
return vsscanf((char *)buffer->ptr, format, args);
}
static char *snd_input_buffer_gets(snd_input_t *input, char *str, size_t size)
{
snd_input_buffer_t *buffer = input->private_data;
size_t bsize = buffer->size;
while (--size > 0 && bsize > 0) {
unsigned char c = *buffer->ptr++;
bsize--;
*str++ = c;
if (c == '\n')
break;
}
if (bsize == buffer->size)
return NULL;
buffer->size = bsize;
*str = '\0';
return str;
}
static int snd_input_buffer_getc(snd_input_t *input)
{
snd_input_buffer_t *buffer = input->private_data;
if (buffer->size == 0)
return EOF;
buffer->size--;
return *buffer->ptr++;
}
static int snd_input_buffer_ungetc(snd_input_t *input, int c)
{
snd_input_buffer_t *buffer = input->private_data;
if (buffer->ptr == buffer->buf)
return EOF;
buffer->ptr--;
assert(*buffer->ptr == (unsigned char) c);
buffer->size++;
return c;
}
static const snd_input_ops_t snd_input_buffer_ops = {
.close = snd_input_buffer_close,
.scan = snd_input_buffer_scan,
.gets = snd_input_buffer_gets,
.getch = snd_input_buffer_getc,
.ungetch = snd_input_buffer_ungetc,
};
#endif
/**
* \brief Creates a new input object from a memory buffer.
* \param inputp The function puts the pointer to the new input object
* at the address specified by \p inputp.
* \param buf Address of the input buffer.
* \param size Size of the input buffer.
* \return Zero if successful, otherwise a negative error code.
*
* This functions creates a copy of the input buffer, so the application is
* not required to preserve the buffer after this function has been called.
*/
int snd_input_buffer_open(snd_input_t **inputp, const char *buf, ssize_t size)
{
snd_input_t *input;
snd_input_buffer_t *buffer;
assert(inputp);
buffer = calloc(1, sizeof(*buffer));
if (!buffer)
return -ENOMEM;
input = calloc(1, sizeof(*input));
if (!input) {
free(buffer);
return -ENOMEM;
}
if (size < 0)
size = strlen(buf);
buffer->buf = malloc((size_t)size + 1);
if (!buffer->buf) {
free(input);
free(buffer);
return -ENOMEM;
}
memcpy(buffer->buf, buf, (size_t) size);
buffer->buf[size] = 0;
buffer->ptr = buffer->buf;
buffer->size = size;
input->type = SND_INPUT_BUFFER;
input->ops = &snd_input_buffer_ops;
input->private_data = buffer;
*inputp = input;
return 0;
}
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