www.pudn.com > socks5.zip > stcopy.c

/* 
 * Copyright (c) 1989, 1990, 1991 by the University of Washington 
 * 
 * For copying and distribution information, please see the file 
 * . 
 */ 
 
#include  
#include  
 
char	*stcopyr(); 
 
int	string_count = 0; 
int	string_max = 0; 
 
/* 
 * stcopy - allocate space for and copy a string 
 * 
 *     STCOPY takes a string as an argument, allocates space for 
 *     a copy of the string, copies the string to the allocated space, 
 *     and returns a pointer to the copy. 
 */ 
 
char * 
stcopy(st) 
    char	*st; 
    { 
      if (!st) return(NULL); 
      if (string_max < ++string_count) string_max = string_count; 
 
      return strcpy((char *)malloc(strlen(st) + 1), st); 
    } 
 
/* 
 * stcopyr - copy a string allocating space if necessary 
 * 
 *     STCOPYR takes a string, S, as an argument, and a pointer to a second 
 *     string, R, which is to be replaced by S.  If R is long enough to 
 *     hold S, S is copied.  Otherwise, new space is allocated, and R is 
 *     freed.  S is then copied to the newly allocated space.  If S is 
 *     NULL, then R is freed and NULL is returned. 
 * 
 *     In any event, STCOPYR returns a pointer to the new copy of S, 
 *     or a NULL pointer. 
 */ 
char * 
stcopyr(s,r) 
    char	*s; 
    char	*r; 
    { 
	int	sl; 
 
	if(!s && r) { 
	    free(r); 
	    string_count--; 
	    return(NULL); 
	} 
	else if (!s) return(NULL); 
 
	sl = strlen(s) + 1; 
 
	if(r) { 
	    if ((strlen(r) + 1) < sl) { 
		free(r); 
		r = (char *) malloc(sl); 
	    } 
	} 
	else { 
	    r = (char *) malloc(sl); 
	    string_count++; 
	    if(string_max < string_count) string_max = string_count; 
	} 
	     
	return strcpy(r,s); 
    } 
 
/* 
 * stfree - free space allocated by stcopy or stalloc 
 * 
 *     STFREE takes a string that was returned by stcopy or stalloc  
 *     and frees the space that was allocated for the string. 
 */ 
void 
stfree(st) 
    char *st; 
    { 
	if(st) { 
	    free(st); 
	    string_count--; 
	} 
    }