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/********************************************************************
* $Author: jgoerzen $
* $Revision: 1.1 $
* $Date: 2000/08/19 00:28:56 $
* $Source: /home/jgoerzen/tmp/gopher-umn/gopher/head/object/STRstring.c,v $
* $Status: $
*
* Paul Lindner, University of Minnesota CIS.
*
* Copyright 1991, 1992 by the Regents of the University of Minnesota
* see the file "Copyright" in the distribution for conditions of use.
*********************************************************************
* MODULE: STRstring.c
* Implement dynamic string library functions
*********************************************************************
* Revision History:
* $Log: STRstring.c,v $
* Revision 1.1 2000/08/19 00:28:56 jgoerzen
* Initial revision
*
* Revision 3.11 1995/09/25 22:07:19 lindner
* Ansification
*
* Revision 3.10 1995/06/30 20:32:04 lindner
* start protoing
*
* Revision 3.9 1994/03/17 05:52:49 lindner
* Fix for multiple STRinits
*
* Revision 3.8 1994/03/04 17:31:39 lindner
* Don't assume a char is one byte long
*
* Revision 3.7 1994/02/20 16:23:13 lindner
* Optimize STRinit so that memory isn't freed then reallocated
*
* Revision 3.6 1993/10/27 18:53:23 lindner
* don't forget \0
*
* Revision 3.5 1993/10/22 20:15:52 lindner
* Remove superfulous declaration of len (Fote)
*
* Revision 3.4 1993/10/19 20:46:00 lindner
* Better, tighter STRstring stuff (Fote)
*
* Revision 3.3 1993/08/16 19:35:09 lindner
* Return a correct value for STRcpy
*
* Revision 3.2 1993/03/24 17:07:52 lindner
* STRset with a NULL value will STRinit() the string
*
* Revision 3.1.1.1 1993/02/11 18:03:03 lindner
* Gopher+1.2beta release
*
* Revision 1.1 1992/12/10 23:27:52 lindner
* gopher 1.1 release
*
*
*********************************************************************/
#include "STRstring.h"
#include "String.h"
#include "Malloc.h"
/*
* Make a new string, don't set anything for default yet.
*/
String *
STRnew(void)
{
String *temp;
temp = (String *) malloc(sizeof(String));
temp->data = NULL;
temp->len = 0;
return(temp);
}
/*
* Destroy a string
*/
void
STRdestroy(String *st)
{
if (st != NULL) {
if (st->data != NULL)
free(st->data);
free(st);
} else
perror("STRdestroy: non existant string!\n");
}
/*
* Don't free the memory. Instead, negate the length value and keep the
* memory for later use. More efficient that way.
*/
void
STRinit(String *st)
{
if (st != NULL) {
if (st->len > 0)
st->len = - st->len;
/* if (st->data != NULL) {
free(st->data);
st->data = NULL;
}*/
} else
perror("STRinit, non existant string!");
}
/*
* Set a string value
*/
void
STRset(String *st, char *str)
{
register int len;
/* To set a null value, STRinit the item */
if (str == NULL) {
STRinit(st);
return;
}
/* Negative value for len means memory is initialized, reset to
positive value so the rest of the code works well.
*/
if (st->len < 0)
st->len = -st->len;
if (*str == '\0')
len = 1;
else
len = strlen(str)+1; /** Don't forget the '\0' **/
/* Uninitialized data... */
if (st->data == NULL) {
st->data = (char *) malloc(sizeof(char*) * len);
st->len = len;
}
/** Something's already there... **/
else if (STRsize(st) < len) {
char *temp;
temp = (char *) realloc(st->data, sizeof(char) * len);
/*** Should check for NULL ... ***/
if (temp == NULL)
perror("realloc failed...");
st->data = temp;
st->len = len;
}
/* space is ok and st->len is set, so copy in the new string */
strcpy(st->data, str);
}
/*
* Add a string to the end of the string that's there already
*/
String*
STRcat(String *st, char *cp)
{
int len;
char *temp;
if (cp == NULL)
return(NULL);
if (STRlen(st) == 0) {
STRset(st, cp);
return(st);
}
len = strlen(cp) + STRlen(st);
temp = (char *) malloc(sizeof(char) * len);
strcpy(temp, STRget(st));
strcat(temp, cp);
STRset(st, temp);
free(temp);
return(st);
}
int
STRcmp(String *st1, String *st2)
{
register char *cp1, *cp2;
cp1 = STRget(st1);
cp2 = STRget(st2);
if (cp1 == NULL)
return(- !0);
else if (cp2 == NULL)
return( !0);
else
return(strcmp(cp1, cp2));
}
String*
STRcpy(String *s1, String *s2)
{
STRset(s1, STRget(s2));
return(s1);
}
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