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Full Discussion: malloc vs realloc
Top Forums Programming malloc vs realloc Post 302404767 by cyler on Wednesday 17th of March 2010 07:54:26 AM
Old 03-17-2010
malloc vs realloc
Why when using realloc, john is reversed 3 times but not the other 2 names ? But if I use malloc, then the 3 names are reversed correctly ? (but then there is a memory leak)

How can I reverse all 3 names without a memory leak ?

Code:
char *BUFFER = NULL;

char *STRREVERSE(const char *STRING)
{
	BUFFER = (char *)realloc(BUFFER, strlen(STRING) + 1);

	size_t COUNT = 0;
	size_t LENGTH = strlen(STRING) - 1;

	while(COUNT <= LENGTH)
	{
		BUFFER[COUNT] = STRING[LENGTH - COUNT];

		COUNT++;
	}

	BUFFER[COUNT] = '\0';

	return BUFFER;
}

int main(void)
{
	printf("%s\n%s\n%s\n", STRREVERSE("john"), STRREVERSE("jack"), STRREVERSE("jill"));

	return 0;
}

Last edited by cyler; 03-17-2010 at 04:58 PM..
 

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LEARN ABOUT LINUX

string

STRING(3)						     Linux Programmer's Manual							 STRING(3)

NAME

       stpcpy, strcasecmp, strcat, strchr, strcmp, strcoll, strcpy, strcspn, strdup, strfry, strlen, strncat, strncmp, strncpy, strncasecmp, strp-
       brk, strrchr, strsep, strspn, strstr, strtok, strxfrm, index, rindex - string operations

SYNOPSIS

       #include <strings.h>

       int strcasecmp(const char *s1, const char *s2);

       int strncasecmp(const char *s1, const char *s2, size_t n);

       char *index(const char *s, int c);

       char *rindex(const char *s, int c);

       #include <string.h>

       char *stpcpy(char *dest, const char *src);

       char *strcat(char *dest, const char *src);

       char *strchr(const char *s, int c);

       int strcmp(const char *s1, const char *s2);

       int strcoll(const char *s1, const char *s2);

       char *strcpy(char *dest, const char *src);

       size_t strcspn(const char *s, const char *reject);

       char *strdup(const char *s);

       char *strfry(char *string);

       size_t strlen(const char *s);

       char *strncat(char *dest, const char *src, size_t n);

       int strncmp(const char *s1, const char *s2, size_t n);

       char *strncpy(char *dest, const char *src, size_t n);

       char *strpbrk(const char *s, const char *accept);

       char *strrchr(const char *s, int c);

       char *strsep(char **stringp, const char *delim);

       size_t strspn(const char *s, const char *accept);

       char *strstr(const char *haystack, const char *needle);

       char *strtok(char *s, const char *delim);

       size_t strxfrm(char *dest, const char *src, size_t n);

DESCRIPTION

       The string functions perform string operations on null-terminated strings.  See the individual man pages for descriptions of each function.

SEE ALSO

       index(3), rindex(3), strcasecmp(3), stpcpy(3), strcat(3), strchr(3), strcmp(3), strcoll(3), strcpy(3),  strcspn(3),  strdup(3),	strfry(3),
       strlen(3),  strncasecmp(3),  strncat(3),  strncmp(3),  strncpy(3),  strpbrk(3),	strrchr(3),  strsep(3),  strspn(3),  strstr(3), strtok(3),
       strxfrm(3)

COLOPHON

       This page is part of release 3.27 of the Linux man-pages project.  A description of the project, and information about reporting bugs,  can
       be found at http://www.kernel.org/doc/man-pages/.

								    2010-02-25								 STRING(3)
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