1 files changed, 337 insertions, 0 deletions
diff --git a/alsa-lib/src/input.c b/alsa-lib/src/input.c
new file mode 100644
index 0000000..7cfbe56
--- /dev/null
+++ b/alsa-lib/src/input.c
@@ -0,0 +1,337 @@
+/**
+ * \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., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
+ *
+ */
+
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include "local.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;
+}
+