strsplit.c

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/* 
   String splitter functions
   Copyright (C) 1999, Joe Orton <[e-mail]>
                                                                     
   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.
  
   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty 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.

   $Id: strsplit.c,v 1.11.2.1 1999/07/20 12:53:58 joe Exp $
*/

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif
#ifdef HAVE_STRING_H
#include <string.h>
#endif
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif

/* glibc2.1 has strdup as a macro */
#ifndef strdup
char *strdup (const char *);
#endif

#include "strsplit.h"

char **strsplit( const char *str, const char separator,
		 const char *quotes, const char *whitespace ) {
    char **comps;
    const char *pnt, *quot = NULL,
	*start, *end; /* The start of the current component */
    int count, /* The number of components */
	iswhite, /* is it whitespace */
	issep, /* is it the separator */
	curr, /* current component index */
	length, /* length of component */
	leading_wspace; /* in leading whitespace still? */

    /* Inefficient, but easier - first off, count the number of 
     * components we have. */
    count = 1;
    for( pnt = str; *pnt!='\0'; pnt++ ) {
	if( quotes != NULL ) {
	    quot = strchr( quotes, *pnt );
	}
	if( quot != NULL ) {
	    /* We found a quote, so skip till the next quote */
	    for( pnt++; (*pnt!=*quot) && (*pnt!='\0'); pnt++ )
		/* nullop */;
	} else if( *pnt == separator ) {
	    count++;
	}
    }

    /* Now, have got the number of components.
     * Allocate the comps array. +1 for the NULL */
    comps = malloc( sizeof(char *) * (count + 1) );
    comps[count] = NULL;
    
    quot = end = start = NULL;
    curr = 0;
    leading_wspace = 1;

    /* Now fill in the array */
    for( pnt = str; *pnt != '\0'; pnt++ ) {
	/* What is the current character - quote, whitespace, separator? */
	if( quotes != NULL ) {
	    quot = strchr( quotes, *pnt );
	}
	iswhite = (whitespace!=NULL) && 
	    (strchr( whitespace, *pnt ) != NULL );
	issep = (*pnt == separator);
	/* What to do? */
	if( leading_wspace ) {
	    if( quot!=NULL ) {
		/* Quoted bit */
		start = pnt;
		length = 1;
		leading_wspace = 0;
	    } else if( issep ) {
		/* Zero-length component */
		comps[curr++] = strdup("");
	    } else if( !iswhite ) {
		start = end = pnt;
		length = 1;
		leading_wspace = 0;
	    }
	} else {
	    if( quot!=NULL ) {
		/* Quoted bit */
		length++;
	    } else if( issep ) {
		/* End of component - enter it into the array */
		length = (end - start) + 1;
		comps[curr] = malloc( length+1 );
		memcpy( comps[curr], start, length );
		comps[curr][length] = '\0';
		curr++;
		leading_wspace = 1;
	    } else if( !iswhite ) {
		/* Not whitespace - update end marker */
		end = pnt;
	    }
	}
	if( quot != NULL ) {
	    /* Skip to closing quote */
	    for( pnt++; *pnt!=*quot && *pnt != '\0'; ++pnt )
		/* nullop */;
	    /* Last non-wspace char is closing quote */
	    end = pnt;
	}
    }
    /* Handle final component */
    if( leading_wspace ) {
	comps[curr] = strdup( "" );
    } else {
	/* End of component - enter it into the array */
	length = (end - start) + 1;
	comps[curr] = malloc( length+1 );
	memcpy( comps[curr], start, length );
	comps[curr][length] = '\0';
    }
    return comps;
}

char **strpairs( const char *str, const char compsep, const char kvsep, 
		 const char *quotes, const char *whitespace ) {
    char **comps, **curr, **pairs, *split;
    int count = 0, n, length;
    comps = strsplit( str, compsep, quotes, whitespace );
    for( curr = comps; *curr!=NULL; curr++ ) {
	count++;
    }
    /* Allocate space for 2* as many components as strsplit returned,
     * +2 for the NULLS. */
    pairs = malloc( (2*count+2) * sizeof(char *) );
    for( n = 0; n < count; n++ ) {
	/* Find the split */
	split = strchr( comps[n], kvsep );
	if( split == NULL ) {
	    /* No seperator found */
	    length = strlen(comps[n]);
	} else {
	    length = split-comps[n];
	}
	/* Enter the key into the array */
	pairs[2*n] = malloc( length+1 );
	memcpy( pairs[2*n], comps[n], length );
	pairs[2*n][length] = '\0';
	/* Now the value. */
	if( split == NULL ) {
	    pairs[2*n+1] = NULL;
	} else {
	    /* Length is -1 to skip the separator. */
	    length = strlen( comps[n] ) - (length+1);
	    pairs[2*n+1] = malloc( length+1 );
	    memcpy( pairs[2*n+1], split+1, length );
	    pairs[2*n+1][length] = '\0';
	}
    }
    pairs[2*count] = pairs[2*count+1] = NULL;    
    return pairs;
}

void strsplit_free( char **components ) {
    char **pnt = components;
    while( *pnt != NULL ) {
	free( *pnt );
	pnt++;
    }
}

void strpairs_free( char **pairs ) {
    int n;
    for( n = 0; pairs[n] != NULL; n+=2 ) {
	free( pairs[n] );
	if( pairs[n+1] != NULL )
	    free( pairs[n+1] );
    }
}

char *strstrip( const char *str, const char ch ) {
    size_t len = strlen( str );
    char *ret;
    if( str[len-1] == ch ) {
	len--;
    }
    if( str[0] == ch ) {
	len--;
	str++;
    }
    ret = malloc( len + 1 );
    memcpy( ret, str, len );
    ret[len] = '\0';
    return ret;
}

#ifdef STRSPLIT_TEST

#include <stdio.h>

int main( int argc, char *argv[] ) {
    char *str, sep, **comps, *wspace, *quotes;
    int count;
    if( argc < 3 ) {
	printf( "Usage: strsplit <sep> <string> [whitespace] [quotes]\n" );
	return -1;
    }
    sep = *argv[1];
    str = argv[2];
    if( argc > 3 ) {
        wspace = argv[3];
    } else {
	wspace = " ";
    }
    if( argc > 4 ) {
	quotes = argv[4];
    } else {
	quotes = "\"";
    }
    printf( "String: [%s]  Separator: `%c'  Whitespace: [%s]  Quotes: [%s]\n", str, sep, wspace, quotes );
    comps = strsplit( str, sep, quotes, wspace );
    count = 0;
    do {
	printf( "Component #%d: [%s]\n", count, comps[count] );
    } while( comps[++count] != NULL );
    return 0;
}

#endif

#ifdef STRPAIRS_TEST

#include <stdio.h>

int main( int argc, char *argv[] ) {
    char *str, compsep, kvsep, **comps, *wspace, *quotes;
    int count;
    if( argc < 4 ) {
	printf( "Usage: strpairs <compsep> <kvsep> <string> [whitespace] [quotes]\n" );
	return -1;
    }
    compsep = *argv[1];
    kvsep = *argv[2];
    str = argv[3];
    if( argc > 4 ) {
        wspace = argv[4];
    } else {
	wspace = " ";
    }
    if( argc > 5 ) {
	quotes = argv[5];
    } else {
	quotes = "\"";
    }
    printf( "String: [%s]  CompSep: `%c' K/VSep: `%c'\nWhitespace: [%s]  Quotes: [%s]\n", str, compsep, kvsep, wspace, quotes );
    comps = strpairs( str, compsep, kvsep, quotes, wspace );
    count = 0;
    do {
	printf( "Component #%d: Key [%s] Value [%s]\n", count, 
		comps[count], comps[count+1] );
    } while( comps[(count+=2)] != NULL );
    return 0;
}

#endif

/* variables:
 *
 * Local variables:
 *  compile-command: "gcc -g -O2 -Wall -I.. -ansi -DHAVE_CONFIG_H -DSTRSPLIT_TEST -o strsplit strsplit.c"
 * End:
 */