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#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
char *f_strsub( char *psrc, char * const psrci,
size_t ofst, size_t szi ){
char *p = NULL;
extern int errno;
const size_t siz_src = strlen(psrc);
const size_t siz_srci = strlen(psrci);
const size_t siz_max = ( siz_src + siz_srci + szi +1);
errno = 0;
if( szi == siz_srci ){
if( NULL == (p = strdup(psrc) ))
return NULL;
if( 1 == szi )
*(p+ofst) = *psrci;
else
(void)memcpy((p+ofst), psrci, szi);
return p;
}
if( NULL == (p = malloc((sizeof *p) *siz_max) ) )
return NULL;
(void)memset( p, 0, siz_max );
(void)memcpy( p, psrc, siz_src );
(void)memcpy( ( p + ofst ), psrci, siz_srci );
(void)memcpy( ( p + ofst + siz_srci ),( psrc + ofst + szi),
siz_src - szi - ofst + 1 );
return p;
}
int main( void ){
char *p = NULL;
char *pp = NULL;
extern int errno;
if( NULL == (p =strdup("bonjour a tous\0") )){
(void)fprintf(stderr, "Erreur(%d)\t:%s\n\t%s\n", errno,
"Erreur allocation data", strerror(errno));
return EXIT_FAILURE;
}
if( NULL == (pp = strdup( "soir\0" ) ) ){
(void)fprintf(stderr, "Erreur(%d)\t:%s\n\t%s\n", errno,
"Erreur allocation data", strerror(errno));
return EXIT_FAILURE;
}
(void)fprintf(stderr, "Echo\t:%s\n", p );
p = f_strsub(p, pp, 3, 4 );
if( NULL == p )
exit( EXIT_FAILURE );
fprintf( stdout, "[>>]\t: %s\n", p );
free( p);
free( pp );
p = NULL;
pp = NULL;
return EXIT_SUCCESS;
} |
