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