mirror of https://github.com/ericonr/sndio.git
139 lines
2.9 KiB
C
139 lines
2.9 KiB
C
/* $OpenBSD: tools.c,v 1.1 2010/11/06 20:25:42 ratchov Exp $ */
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/*
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* Copyright (c) 2008 Alexandre Ratchov <alex@caoua.org>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <sndio.h>
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#include "tools.h"
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/*
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* Generate a string corresponding to the encoding in par,
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* return the length of the resulting string
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*/
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int
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enctostr(struct sio_par *par, char *ostr)
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{
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char *p = ostr;
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*p++ = par->sig ? 's' : 'u';
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if (par->bits > 9)
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*p++ = '0' + par->bits / 10;
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*p++ = '0' + par->bits % 10;
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if (par->bps > 1) {
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*p++ = par->le ? 'l' : 'b';
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*p++ = 'e';
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if (par->bps != SIO_BPS(par->bits) ||
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par->bits < par->bps * 8) {
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*p++ = par->bps + '0';
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if (par->bits < par->bps * 8) {
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*p++ = par->msb ? 'm' : 'l';
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*p++ = 's';
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*p++ = 'b';
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}
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}
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}
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*p++ = '\0';
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return p - ostr - 1;
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}
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/*
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* Parse an encoding string, examples: s8, u8, s16, s16le, s24be ...
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* Return the number of bytes consumed
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*/
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int
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strtoenc(struct sio_par *par, char *istr)
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{
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char *p = istr;
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int i, sig, bits, le, bps, msb;
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#define IS_SEP(c) \
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(((c) < 'a' || (c) > 'z') && \
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((c) < 'A' || (c) > 'Z') && \
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((c) < '0' || (c) > '9'))
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/*
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* get signedness
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*/
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if (*p == 's') {
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sig = 1;
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} else if (*p == 'u') {
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sig = 0;
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} else
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return 0;
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p++;
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/*
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* get number of bits per sample
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*/
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bits = 0;
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for (i = 0; i < 2; i++) {
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if (*p < '0' || *p > '9')
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break;
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bits = (bits * 10) + *p - '0';
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p++;
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}
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if (bits < 1 || bits > 32)
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return 0;
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bps = SIO_BPS(bits);
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le = SIO_LE_NATIVE;
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msb = 1;
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/*
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* get (optional) endianness
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*/
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if (p[0] == 'l' && p[1] == 'e') {
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le = 1;
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p += 2;
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} else if (p[0] == 'b' && p[1] == 'e') {
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le = 0;
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p += 2;
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} else if (IS_SEP(*p)) {
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goto done;
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} else
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return 0;
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/*
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* get (optional) number of bytes
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*/
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if (*p >= '1' && *p <= '4') {
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bps = *p - '0';
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if (bps * 8 < bits)
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return 0;
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p++;
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/*
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* get (optional) alignment
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*/
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if (p[0] == 'm' && p[1] == 's' && p[2] == 'b') {
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msb = 1;
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p += 3;
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} else if (p[0] == 'l' && p[1] == 's' && p[2] == 'b') {
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msb = 0;
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p += 3;
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} else if (IS_SEP(*p)) {
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goto done;
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} else
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return 0;
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} else if (!IS_SEP(*p))
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return 0;
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done:
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par->msb = msb;
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par->sig = sig;
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par->bits = bits;
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par->bps = bps;
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par->le = le;
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return p - istr;
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}
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