dmake/dmstring.c

   1 /* RCS  $Id: dmstring.c,v 1.2 2007-01-18 09:29:40 vg Exp $
   2 --
   3 -- SYNOPSIS
   4 --      String handling code
   5 --
   6 -- DESCRIPTION
   7 --  Routines to handle string manipulation.  This code is not specific
   8 --  to dmake and has/and will be used in other programs.  The string
   9 --  "" is considered the NULL string, if NIL(char) is received instead
  10 --  undefined results may occurr.  (In reality NIL(char) is checked for
  11 --  but in general it is not safe to assume NIL(char) ==  NULL)
  12 --
  13 -- AUTHOR
  14 --      Dennis Vadura, dvadura@dmake.wticorp.com
  15 --
  16 -- WWW
  17 --      http://dmake.wticorp.com/
  18 --
  19 -- COPYRIGHT
  20 --      Copyright (c) 1996,1997 by WTI Corp.  All rights reserved.
  21 --
  22 --      This program is NOT free software; you can redistribute it and/or
  23 --      modify it under the terms of the Software License Agreement Provided
  24 --      in the file <distribution-root>/readme/license.txt.
  25 --
  26 -- LOG
  27 --      Use cvs log to obtain detailed change logs.
  28 */
  29
  30 #include "extern.h"
  31
  32 PUBLIC char *
  33 DmStrJoin( src, data, n, fr )/*
  34 ===============================
  35    Join data to src according to value of n.
  36
  37       n = -1   - return strcat( src, data )
  38       n >= 0   - return strncat( src, data, n )
  39
  40    FREE original src if fr == TRUE, else leave it alone */
  41
  42 char *src;
  43 char *data;
  44 int  n;
  45 int  fr;
  46 {
  47    char *t;
  48    int  l;
  49    int  flag = FALSE;
  50
  51    DB_ENTER( "DmStrJoin" );
  52
  53    if( src  == NIL(char) ) { src = ""; flag = TRUE; }
  54    if( data == NIL(char) ) data = "";
  55    DB_PRINT( "str", ("Joining [%s] [%s] %d", src, data, n) );
  56
  57    if( n == -1 )  n = strlen( data );
  58
  59    l = strlen( src ) + n + 1;
  60    if( (t = MALLOC( l, char )) == NIL(char) ) No_ram();
  61
  62    strcpy( t, src );
  63    if (n) strncat( t, data, n );
  64    t[ l-1 ] = '\0';
  65
  66    if( !flag && fr ) FREE( src );
  67
  68    DB_PRINT( "str", ("Result  [%s]", t) );
  69    DB_RETURN( t );
  70 }
  71
  72
  73
  74
  75 PUBLIC char *
  76 DmStrAdd( src, data, fr )/*
  77 ===========================
  78    append data to src with space in between if src is not NIL(char) or ""
  79    and free both src and data if fr == TRUE, otherwise leave them be */
  80
  81 char *src;
  82 char *data;
  83 int  fr;
  84 {
  85    char *t;
  86    int  l;
  87    int  sflag;
  88    int  dflag;
  89
  90    DB_ENTER( "DmStrAdd" );
  91
  92    sflag = dflag = fr;
  93
  94    if( src  == NIL(char) ) { src  = ""; sflag = FALSE; }
  95    if( data == NIL(char) ) { data = ""; dflag = FALSE; }
  96    DB_PRINT( "str", ("Adding [%s] [%s] %d", src, data, fr) );
  97
  98    l = strlen(src) + strlen(data) + 1;
  99    if( *src ) l++;
 100
 101    if( (t = MALLOC( l, char )) == NIL(char) ) No_ram();
 102
 103    strcpy( t, src );
 104
 105    if( *data )
 106    {
 107       if( *src ) strcat( t,  " " );
 108       strcat( t, data );
 109    }
 110
 111    if( sflag )  FREE( src  );
 112    if( dflag )  FREE( data );
 113
 114    DB_PRINT( "str", ("Result  [%s]", t) );
 115    DB_RETURN( t );
 116 }
 117
 118
 119
 120 PUBLIC char *
 121 DmStrApp( src1, src2 )/*
 122 ========================
 123    Append two strings together, and return the result with a space between
 124    the two strings.  FREE the first string if it is not NIL and always
 125    leave the second string be. */
 126 char *src1;
 127 char *src2;
 128 {
 129    src2 = DmStrAdd( src1, src2, FALSE );
 130    if( src1 != NIL(char) ) FREE( src1 );
 131    return( src2 );
 132 }
 133
 134
 135 PUBLIC char *
 136 DmStrDup( str )/*
 137 =================  Duplicate the contents of a string, by using malloc */
 138 char *str;
 139 {
 140    char *t;
 141
 142    if( str == NIL(char) ) return( NIL(char) );
 143
 144    if( (t = MALLOC( strlen( str )+1, char )) == NIL(char) ) No_ram();
 145    strcpy( t, str );
 146
 147    return( t );
 148 }
 149
 150
 151
 152 PUBLIC char *
 153 DmStrDup2( str )/*
 154 ==================
 155    This function is used solely to properly quote command line arguments when
 156    they are reinserted int MAKEMACROS so that they can be used further in
 157    a processing line. */
 158 char *str;
 159 {
 160    char *t;
 161    size_t size;
 162    size_t alloced;
 163    char *tmp;
 164    char *dest;
 165    int seen_equal = 0;
 166
 167    if(str == NIL(char)) return(NIL(char));
 168    size = strlen(str) + 1;
 169    alloced = size + 2;      /* for two quotes */
 170
 171    for(tmp = str; *tmp; tmp++)
 172       if(*tmp == '"')
 173          alloced++;
 174
 175    if((t = MALLOC(alloced, char)) == NIL(char)) No_ram();
 176
 177    for(tmp = str, dest = t; *tmp; tmp++, dest++) {
 178       if(*tmp == '=' && !seen_equal) {
 179      seen_equal = 1;
 180      *dest++ = *tmp;
 181      *dest = '"';
 182      continue;
 183       }
 184       if(*tmp == '"')
 185      *dest++ = '\\';
 186       *dest = *tmp;
 187    }
 188
 189    if(!seen_equal)
 190       Fatal("DmStrDup2 invoked without argument of form x=y\n");
 191
 192    *dest++ = '"';
 193    *dest = 0;
 194
 195    return t;
 196 }
 197
 198
 199
 200 PUBLIC char *
 201 DmStrPbrk( s1, s2 )/*
 202 ====================
 203    find first occurrence of char in s2 in string s1.
 204    Returns a pointer to the first occurrence.  NOTE '\0' is considered part
 205    of s2 and a pointer to it is returned if no other chars match. */
 206
 207 char *s1;
 208 char *s2;
 209 {
 210    register char *t;
 211
 212    if( s1 == NIL(char) || s2 == NIL(char) ) return( "" );
 213
 214    for( t=s1; *t && (strchr( s2, *t ) == NIL(char)); t++ );
 215    return( t );
 216 }
 217
 218
 219
 220
 221 PUBLIC char *
 222 DmStrSpn( s1, s2 )/*
 223 ====================
 224    return pointer to first char in s1 that does not belong to s2.
 225    Returns the pointer if match found, else returns pointer to null char
 226    in s1. (ie. "" ) */
 227
 228 char *s1;
 229 char *s2;
 230 {
 231    register char *t;
 232
 233    if( s1 == NIL(char) || s2 == NIL(char) ) return( "" );
 234
 235    for( t=s1; *t && (strchr( s2, *t ) != NIL(char)); t++ );
 236    return( t );
 237 }
 238
 239
 240
 241
 242 PUBLIC char *
 243 DmStrStr( s1, s2 )/*
 244 ====================  find first occurrence in s1 of s2 */
 245 char *s1;
 246 char *s2;
 247 {
 248    register char *s;
 249    register char *p;
 250    register char *r;
 251
 252    if( s1 != NIL(char) && s2 != NIL(char) )
 253       for( s=s1; *s; s++ )
 254      if( *s == *s2 )
 255      {
 256         for( r=s+1, p = s2+1; *p && (*r == *p); r++, p++ );
 257         if( !*p ) return( s );
 258      }
 259
 260    return( NIL(char) );
 261 }
 262
 263
 264
 265 PUBLIC char *
 266 DmSubStr( s, e )/*
 267 ==================
 268       Return the string between the two pointers s and e, not including the
 269       char that e points to.  NOTE:  This routine assumes that s and e point
 270       into the same string. */
 271
 272 char *s;
 273 char *e;
 274 {
 275    char save;
 276    int  len = e-s;
 277
 278    if( len < 0 || len > strlen(s) )
 279       Fatal( "Internal Error:  SubStr fails consistency test" );
 280
 281    save = *e;
 282    *e   = '\0';
 283    s    = DmStrDup( s );
 284    *e   = save;
 285
 286    return( s );
 287 }
 288
 289
 290 /* Provide "missing" string function. */
 291 #ifndef HAVE_STRLWR
 292 char *
 293 strlwr(char *s)
 294 {
 295    char *p;
 296    for(p=s; *p; p++ )
 297       *p = tolower(*p);
 298    return s;
 299 }
 300 #endif