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97 lines
2.1 KiB
C
97 lines
2.1 KiB
C
/*********************************************************************
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* Copyright 1993, UCAR/Unidata
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* See netcdf/COPYRIGHT file for copying and redistribution conditions.
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* $Header: /upc/share/CVS/netcdf-3/ncgen3/escapes.c,v 1.2 1997/03/19 23:15:09 davis Exp $
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*********************************************************************/
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#include <stdlib.h>
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#include <netcdf.h>
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#include "generic.h"
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#include "ncgen.h"
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#include "genlib.h"
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/*
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* "Expands" valid escape sequences in yystring (read by lex) into the
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* appropriate characters in termstring. For example, the two character
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* sequence "\t" in yystring would be converted into a single tab character
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* in termstring. On return, termstring is properly terminated.
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*/
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void
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expand_escapes(
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char *termstring, /* returned, with escapes expanded */
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char *yytext,
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int yyleng)
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{
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char *s, *t, *endp;
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yytext[yyleng-1]='\0'; /* don't copy quotes */
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/* expand "\" escapes, e.g. "\t" to tab character */
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s = termstring;
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t = yytext+1;
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while(*t) {
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if (*t == '\\') {
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t++;
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switch (*t) {
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case 'a':
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*s++ = '\007'; t++; /* will use '\a' when STDC */
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break;
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case 'b':
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*s++ = '\b'; t++;
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break;
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case 'f':
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*s++ = '\f'; t++;
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break;
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case 'n':
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*s++ = '\n'; t++;
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break;
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case 'r':
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*s++ = '\r'; t++;
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break;
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case 't':
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*s++ = '\t'; t++;
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break;
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case 'v':
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*s++ = '\v'; t++;
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break;
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case '\\':
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*s++ = '\\'; t++;
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break;
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case '?':
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*s++ = '\177'; t++;
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break;
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case '\'':
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*s++ = '\''; t++;
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break;
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case '\"':
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*s++ = '\"'; t++;
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break;
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case 'x':
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t++; /* now t points to one or more hex digits */
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*s++ = (char) strtol(t, &endp, 16);
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t = endp;
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break;
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case '0':
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case '1':
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case '2':
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case '3':
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case '4':
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case '5':
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case '6':
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case '7':
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/* t now points to octal digits */
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*s++ = (char) strtol(t, &endp, 8);
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t = endp;
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break;
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default:
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*s++ = *t++;
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break;
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}
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} else {
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*s++ = *t++;
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}
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}
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*s = '\0';
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return;
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}
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