minix/commands/simple/basename.c

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2005-04-21 16:53:53 +02:00
/* basename - print last part of a path Authors: B. Garfolo & P. Nelson */
/* Basename - print the last part of a path.
*
* For MINIX -- Conforms to POSIX - P1003.2/D10
* Exception -- it ignores the LC environment variables.
*
* Original MINIX author: Blaine Garfolo
* POSIX rewrite author: Philip A. Nelson
*
* POSIX version - October 20, 1990
* Feb 14, 1991: changed rindex to strrchr. (PAN)
*
*/
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#define EOS '\0'
_PROTOTYPE(int main, (int argc, char **argv));
int main(argc, argv)
int argc;
char *argv[];
{
char *result_string; /* The pointer into argv[1]. */
char *temp; /* Used to move around in argv[1]. */
int suffix_len; /* Length of the suffix. */
int suffix_start; /* Where the suffix should start. */
/* Check for the correct number of arguments. */
if ((argc < 2) || (argc > 3)) {
fprintf(stderr, "Usage: basename string [suffix] \n");
exit(1);
}
/* Check for all /'s */
for (temp = argv[1]; *temp == '/'; temp++) /* Move to next char. */
;
if (*temp == EOS) {
printf("/\n");
exit(0);
}
/* Build the basename. */
result_string = argv[1];
/* Find the last /'s */
temp = strrchr(result_string, '/');
if (temp != NULL) {
/* Remove trailing /'s. */
while ((*(temp + 1) == EOS) && (*temp == '/')) *temp-- = EOS;
/* Set result_string to last part of path. */
if (*temp != '/') temp = strrchr(result_string, '/');
if (temp != NULL && *temp == '/') result_string = temp + 1;
}
/* Remove the suffix, if any. */
if (argc > 2) {
suffix_len = strlen(argv[2]);
suffix_start = strlen(result_string) - suffix_len;
if (suffix_start > 0)
if (strcmp(result_string + suffix_start, argv[2]) == EOS)
*(result_string + suffix_start) = EOS;
}
/* Print the resultant string. */
printf("%s\n", result_string);
return(0);
}