Implementation for basename

.gitignore

@@ -77,6 +77,7 @@ src/rmdir/rmdir
 src/sh/sh
 src/sleep/sleep
 src/cksum/cksum
+src/basename/basename
 
 bin/
 

Makefile

@@ -26,6 +26,7 @@ BINS += chmod
 BINS += sh
 BINS += sleep
 BINS += cksum
+BINS += basename
 
 BINARIES := $(foreach b, $(BINS), src/$b/$b)
 BINS-COPY := $(foreach b, $(BINS), bin/$b)

src/basename/Makefile

@@ -0,0 +1,5 @@
+OUT := basename
+
+SRC := basename.c
+
+include ../shared.mk

src/basename/basename.1

@@ -0,0 +1 @@
+\" TODO

src/basename/basename.c

@@ -0,0 +1,106 @@
+#include <errno.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define NAME "basename (canoutils)"
+#define VERSION "0.0.1"
+#define AUTHOR "cospplredman"
+
+#include "cgetopt.h"
+#include "version_info.h"
+
+static const char usage[] = {"Usage: basename [Options]... NAMES [suffix]\n"
+                             "  --version   version information\n"
+                             "  --help      display this help and exit\n"
+                             "  -z          print zero instead of newline\n"
+                             "  -a          multiple NAMES and no suffix\n"};
+
+// flags
+static int print_zero = 0;
+static int multiple = 0;
+
+static struct option long_options[] = {
+    {"version", no_argument, NULL, 'v'},
+    {"help", no_argument, NULL, 'h'},
+};
+
+static char *basename(char *str, char *suffix) {
+  char *end = str + strlen(str), *start = str;
+
+  /* remove trailing '/' */
+  for (; --end > start && *end == '/';)
+    *end = 0;
+
+  /* remove prefix ending with '/' */
+  for (; start < end; start++)
+    if (*start == '/')
+      str = start + 1;
+
+  /* remove suffix */
+  size_t sufflen = strlen(suffix);
+  if (end + 1 - sufflen >= str && strcmp(suffix, end + 1 - sufflen) == 0)
+    *(end + 1 - sufflen) = 0;
+
+  return str;
+}
+
+int main(int argc, char **argv) {
+  int opt, option_index;
+  while ((opt = getopt_long(argc, argv, "za", long_options, &option_index)) !=
+         -1) {
+    switch (opt) {
+    case 0:
+      break;
+    case 'v':
+      print_version();
+      return EXIT_SUCCESS;
+      break;
+    case 'h':
+      printf("%s\n", usage);
+      return EXIT_SUCCESS;
+    case 'z':
+      print_zero = 1;
+      break;
+    case 'a':
+      multiple = 1;
+      break;
+    }
+  }
+
+  argc -= optind;
+  argv += optind;
+
+  if (argc < 1 || (!multiple && argc > 2)) {
+    printf("%s\n", usage);
+    return EXIT_FAILURE;
+  }
+
+  char *suffix = multiple ? "" : argv[1] == NULL ? "" : argv[1];
+  char *string = argv[0];
+
+  char *base = basename(string, suffix);
+  if (print_zero) {
+    printf("%s", base);
+    putchar(0);
+  } else {
+    printf("%s\n", base);
+  }
+
+  if (multiple) {
+    int index = 1;
+    while (index < argc) {
+      string = argv[index];
+      base = basename(string, suffix);
+      if (print_zero) {
+        printf("%s", base);
+        putchar(0);
+      } else {
+        printf("%s\n", base);
+      }
+
+      index++;
+    }
+  }
+}

utils.txt

@@ -23,3 +23,4 @@ rm
 rmdir
 sleep
 cksum
+basename