/*
Copyright © 1998. The Regents of the University of California (Regents). 
All Rights Reserved.

Written by Matt Wright, The Center for New Music and Audio Technologies,
University of California, Berkeley.

Permission to use, copy, modify, distribute, and distribute modified versions
of this software and its documentation without fee and without a signed
licensing agreement, is hereby granted, provided that the above copyright
notice, this paragraph and the following two paragraphs appear in all copies,
modifications, and distributions.

IN NO EVENT SHALL REGENTS BE LIABLE TO ANY PARTY FOR DIRECT, INDIRECT,
SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, INCLUDING LOST PROFITS, ARISING
OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF REGENTS HAS
BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

REGENTS SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
PURPOSE. THE SOFTWARE AND ACCOMPANYING DOCUMENTATION, IF ANY, PROVIDED
HEREUNDER IS PROVIDED "AS IS". REGENTS HAS NO OBLIGATION TO PROVIDE
MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.

The OpenSound Control WWW page is 
    http://www.cnmat.berkeley.edu/OpenSoundControl
*/


/* OSC-string-help.c
   Procedures that could be useful to programmers writing OSC methods that
   take string arguments.

   by Matt Wright, 3/19/98
*/

#include <inttypes.h>

#include <libOSC/OSC-common.h>  /* For Boolean */

#define STRING_ALIGN_PAD 4

char *OSCDataAfterAlignedString(const char *string, const char *boundary, char **errorMsg) {

    int i;

    if ((boundary - string) %4 != 0) {
	fatal_error("DataAfterAlignedString: bad boundary\n");
    }

    for (i = 0; string[i] != '\0'; i++) {
	if (string + i >= boundary) {
	    (*errorMsg) = "DataAfterAlignedString: Unreasonably long string";
	    return 0;
	}
    }

    /* Now string[i] is the first null character */
    i++;

    for (; (i % STRING_ALIGN_PAD) != 0; i++) {
	if (string + i >= boundary) {
	    (*errorMsg) = "Unreasonably long string";
	    return 0;
	}
	if (string[i] != '\0') {
	    (*errorMsg) = "Incorrectly padded string.";
	    return 0;
	}
    }

    return (char *) (string+i);
}

int OSCPaddedStrlen(const char *s) {
    int i;

    for (i = 0; *s != '\0'; s++, i++) {
	/* do nothing */
    }

    /* Now i is the length with no null bytes.  We need 1-4 null bytes,
       to make the total length a multiple of 4.   So we add 4, as if
       we need 4 null bytes, then & 0xfffffffc to round down to the nearest 
       multiple of 4. */

    return (i + 4) & 0xfffffffc;
}

char *OSCPaddedStrcpy(char *target, const char *source) {
  while ((*target++ = *source++)) {
	/* do nothing */
    }

    /* That copied one null byte */
    while (((uint64_t) target) % 4 != 0) {
	*target = '\0';
	target++;
    }
    return target;
}

Boolean OSCParseStringList(const char *result[], int *numStrings, int maxStrings,
			   const char *args, int numBytes) {
    int numFound;
    const char *p;
    const char *boundary = args + numBytes;
    char *errorMessage;

    p = args;

    for (numFound = 0; numFound < maxStrings; ++numFound) {
	if (p == boundary) {
	    *numStrings = numFound;
	    return TRUE;
	}

	result[numFound] = p;
	p = OSCDataAfterAlignedString(p, boundary, &errorMessage);
	if (p == 0) return FALSE;
    }
    return FALSE;
}

