61 lines
1.2 KiB
C
Executable File
61 lines
1.2 KiB
C
Executable File
#define _POSIX_C_SOURCE 200809L
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#include <stdio.h>
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#include <string.h>
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int main(int argc, char ** argv) {
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int i, last_slash = -1, length;
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/* If no path given, print / per the POSIX spec */
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if(argc == 1) {
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printf("/\n");
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return 0;
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}
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/* Same if // is given */
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if(strcmp(argv[1], "//") == 0) {
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printf("/\n");
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return 0;
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}
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/* Oh, look, we use strlen here. */
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length = strlen(argv[1]);
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/* Replace terminal slash (if present) with null */
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if(argv[1][length - 1] == '/') {
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argv[1][length - 1] = '\0';
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}
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/* Find last slash */
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for(i = 0; i < length; i++) {
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if(argv[1][i] == '/') {
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last_slash = i;
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}
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}
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/* If we didn't find a slash, assume PWD per POSIX spec */
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if(last_slash == -1) {
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printf(".\n");
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return 0;
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}
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/* Replace last slash with null to truncate basename */
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argv[1][last_slash] = '\0';
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/* If the dirname is //, /, or blank, print a single slash. */
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if(strcmp(argv[1], "//") == 0 || strcmp(argv[1], "") == 0 ||
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strcmp(argv[1], "/") == 0) {
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printf("/\n");
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return 0;
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}
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/* Remove any trailing slashes from the dirname */
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for(i = last_slash - 1; argv[1][i] == '/'; i--) {
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argv[1][i] = '\0';
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}
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printf("%s\n", argv[1]);
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return 0;
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}
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