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MPW dmake 4.0
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dmstring.c
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1995-06-02
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/* RCS -- $Header: /u5/dvadura/src/public/dmake/src/RCS/dmstring.c,v 1.1 1994/10/06 17:42:52 dvadura Exp $
-- SYNOPSIS -- string handling code
--
-- DESCRIPTION
-- Routines to handle string manipulation. This code is not specific
-- to dmake and has/and will be used in other programs. The string
-- "" is considered the NULL string, if NIL(char) is received instead
-- undefined results may occurr. (In reality NIL(char) is checked for
-- but in general it is not safe to assume NIL(char) == NULL)
--
-- AUTHOR
-- Dennis Vadura, dvadura@watdragon.uwaterloo.ca
-- CS DEPT, University of Waterloo, Waterloo, Ont., Canada
--
-- COPYRIGHT
-- Copyright (c) 1992,1994 by Dennis Vadura. All rights reserved.
--
-- This program is free software; you can redistribute it and/or
-- modify it under the terms of the GNU General Public License
-- (version 1), as published by the Free Software Foundation, and
-- found in the file 'LICENSE' included with this distribution.
--
-- This program is distributed in the hope that it will be useful,
-- but WITHOUT ANY WARRANTY; without even the implied warrant of
-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-- GNU General Public License for more details.
--
-- You should have received a copy of the GNU General Public License
-- along with this program; if not, write to the Free Software
-- Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
--
-- LOG
-- $Log: dmstring.c,v $
* Revision 1.1 1994/10/06 17:42:52 dvadura
* dmake Release Version 4.0, Initial revision
*
*/
#include "extern.h"
PUBLIC char *
DmStrJoin( src, data, n, fr )/*
===============================
Join data to src according to value of n.
n = -1 - return strcat( src, data )
n >= 0 - return strncat( src, data, n )
FREE original src if fr == TRUE, else leave it alone */
char *src;
char *data;
int n;
int fr;
{
char *t;
int l;
int flag = FALSE;
DB_ENTER( "DmStrJoin" );
if( src == NIL(char) ) { src = ""; flag = TRUE; }
if( data == NIL(char) ) data = "";
DB_PRINT( "str", ("Joining [%s] [%s] %d", src, data, n) );
if( n == -1 ) n = strlen( data );
l = strlen( src ) + n + 1;
if( (t = MALLOC( l, char )) == NIL(char) ) No_ram();
strcpy( t, src );
if (n) strncat( t, data, n );
t[ l-1 ] = '\0';
if( !flag && fr ) FREE( src );
DB_PRINT( "str", ("Result [%s]", t) );
DB_RETURN( t );
}
PUBLIC char *
DmStrAdd( src, data, fr )/*
===========================
append data to src with space in between if src is not NIL(char) or ""
and free both src and data if fr == TRUE, otherwise leave them be */
char *src;
char *data;
int fr;
{
char *t;
int l;
int sflag;
int dflag;
DB_ENTER( "DmStrAdd" );
sflag = dflag = fr;
if( src == NIL(char) ) { src = ""; sflag = FALSE; }
if( data == NIL(char) ) { data = ""; dflag = FALSE; }
DB_PRINT( "str", ("Adding [%s] [%s] %d", src, data, fr) );
l = strlen(src) + strlen(data) + 1;
if( *src ) l++;
if( (t = MALLOC( l, char )) == NIL(char) ) No_ram();
strcpy( t, src );
if( *data )
{
if( *src ) strcat( t, " " );
strcat( t, data );
}
if( sflag ) FREE( src );
if( dflag ) FREE( data );
DB_PRINT( "str", ("Result [%s]", t) );
DB_RETURN( t );
}
PUBLIC char *
DmStrApp( src1, src2 )/*
========================
Append two strings together, and return the result with a space between
the two strings. FREE the first string if it is not NIL and always
leave the second string be. */
char *src1;
char *src2;
{
src2 = DmStrAdd( src1, src2, FALSE );
if( src1 != NIL(char) ) FREE( src1 );
return( src2 );
}
PUBLIC char *
DmStrDup( str )/*
================= Duplicate the contents of a string, by using malloc */
char *str;
{
char *t;
if( str == NIL(char) ) return( NIL(char) );
if( (t = MALLOC( strlen( str )+1, char )) == NIL(char) ) No_ram();
strcpy( t, str );
return( t );
}
PUBLIC char *
DmStrDup2( str )/*
==================
This function is used solely to properly quote command line arguments when
they are reinserted int MAKEMACROS so that they can be used further in
a processing line. */
char *str;
{
char *t;
size_t size;
size_t alloced;
char *tmp;
char *dest;
int seen_equal = 0;
if(str == NIL(char)) return(NIL(char));
size = strlen(str) + 1;
alloced = size + 2; /* for two quotes */
for(tmp = str; *tmp; tmp++)
if(*tmp == '"')
alloced++;
if((t = MALLOC(alloced, char)) == NIL(char)) No_ram();
for(tmp = str, dest = t; *tmp; tmp++, dest++) {
if(*tmp == '=' && !seen_equal) {
seen_equal = 1;
*dest++ = *tmp;
*dest = '"';
continue;
}
if(*tmp == '"')
*dest++ = '\\';
*dest = *tmp;
}
if(!seen_equal)
Fatal("DmStrDup2 invoked without argument of form x=y\n");
*dest++ = '"';
*dest = 0;
return t;
}
PUBLIC char *
DmStrPbrk( s1, s2 )/*
====================
find first occurence of char in s2 in string s1.
Returns a pointer to the first occurrence. NOTE '\0' is considered part
of s2 and a pointer to it is returned if no other chars match. */
char *s1;
char *s2;
{
register char *t;
if( s1 == NIL(char) || s2 == NIL(char) ) return( "" );
for( t=s1; *t && (strchr( s2, *t ) == NIL(char)); t++ );
return( t );
}
PUBLIC char *
DmStrSpn( s1, s2 )/*
====================
return pointer to first char in s1 that does not belong to s2.
Returns the pointer if match found, else returns pointer to null char
in s1. (ie. "" ) */
char *s1;
char *s2;
{
register char *t;
if( s1 == NIL(char) || s2 == NIL(char) ) return( "" );
for( t=s1; *t && (strchr( s2, *t ) != NIL(char)); t++ );
return( t );
}
PUBLIC char *
DmStrStr( s1, s2 )/*
==================== find first occurrence in s1 of s2 */
char *s1;
char *s2;
{
register char *s;
register char *p;
register char *r;
if( s1 != NIL(char) && s2 != NIL(char) )
for( s=s1; *s; s++ )
if( *s == *s2 )
{
for( r=s+1, p = s2+1; *p && (*r == *p); r++, p++ );
if( !*p ) return( s );
}
return( NIL(char) );
}
PUBLIC char *
DmSubStr( s, e )/*
==================
Return the string between the two pointers s and e, not including the
char that e points to. NOTE: This routine assumes that s and e point
into the same string. */
char *s;
char *e;
{
char save;
int len = e-s;
if( len < 0 || len > strlen(s) )
Fatal( "Internal Error: SubStr fails consistency test" );
save = *e;
*e = '\0';
s = DmStrDup( s );
*e = save;
return( s );
}