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/* $Id: chresc.c,v 1.1.1.1 2004/12/23 04:04:19 ellson Exp $ $Revision: 1.1.1.1 $ */
/* vim:set shiftwidth=4 ts=8: */
/**********************************************************
* This software is part of the graphviz package *
* http://www.graphviz.org/ *
* *
* Copyright (c) 1994-2004 AT&T Corp. *
* and is licensed under the *
* Common Public License, Version 1.0 *
* by AT&T Corp. *
* *
* Information and Software Systems Research *
* AT&T Research, Florham Park NJ *
**********************************************************/
/*
* Glenn Fowler
* AT&T Research
*
* return the next character in the string s
* \ character constants are converted
* p is updated to point to the next character in s
*/
#include <ast.h>
/* #include <ccode.h> */
int chresc(register const char *s, char **p)
{
register const char *q;
register int c;
switch (c = *s++) {
case 0:
s--;
break;
case '\\':
switch (c = *s++) {
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
c -= '0';
q = s + 2;
while (s < q)
switch (*s) {
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
c = (c << 3) + *s++ - '0';
break;
default:
q = s;
break;
}
break;
case 'a':
c = CC_bel;
break;
case 'b':
c = '\b';
break;
case 'f':
c = '\f';
break;
case 'n':
c = '\n';
break;
case 'r':
c = '\r';
break;
case 's':
c = ' ';
break;
case 't':
c = '\t';
break;
case 'v':
c = CC_vt;
break;
case 'x':
c = 0;
q = s;
while (q)
switch (*s) {
case 'a':
case 'b':
case 'c':
case 'd':
case 'e':
case 'f':
c = (c << 4) + *s++ - 'a' + 10;
break;
case 'A':
case 'B':
case 'C':
case 'D':
case 'E':
case 'F':
c = (c << 4) + *s++ - 'A' + 10;
break;
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
c = (c << 4) + *s++ - '0';
break;
default:
q = 0;
break;
}
break;
case 'E':
c = CC_esc;
break;
case 0:
s--;
break;
}
break;
}
if (p)
*p = (char *) s;
return c;
}
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