Readded some POSIX utils I'd written prior

basename.c

@@ -0,0 +1,90 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+int main(int argc, char ** argv) {
+  int suffix_present = 0, i, j;
+  char *basename; char c;
+  int basename_length = 0, last_slash = 0;
+  int suffix_length = 0;
+
+  if(argc > 2) {
+    suffix_present = 1;
+  }
+  else if(argc == 1) {
+    printf("\n");
+    return 0;
+  }
+
+  if(strcmp(argv[1], "//") == 0) {
+    printf("\n");
+    return 0;
+  }
+
+  i = 0;
+  
+  for(c = argv[1][i]; c != '\0'; c = argv[1][i]) {
+    i++;
+  }
+
+  if(argv[1][i-1] == '/') {
+    argv[1][i-1] = '\0';
+  }
+
+  i = 0;
+  
+  for(c = argv[1][i]; c != '\0'; c = argv[1][i]) {
+    if(c == '/') {
+      last_slash = i;
+    }
+    i++;
+  }
+
+  i = last_slash + 1;
+
+  for(c = argv[1][i]; c != '\0'; c = argv[1][i]) {
+    basename_length++; i++;
+  }
+
+  basename = calloc(basename_length + 1, sizeof(*basename));
+  if(basename == NULL) {
+    fprintf(stderr, "%s: Could not allocate sufficient memory\n", argv[0]);
+    return 1;
+  }
+
+  i = last_slash + 1;
+
+  for(c = argv[1][i]; c != '\0'; c = argv[1][i]) {
+    basename[i - (last_slash + 1)] = c;
+    i++;
+  }
+
+  basename[basename_length] = '\0';
+
+  if(suffix_present && strcmp(basename, argv[2]) != 0) {
+    i = 0;
+    for(c = argv[2][i]; c != '\0'; c = argv[2][i]) {
+      suffix_length++;
+      i++;
+    }
+    
+    j = suffix_length - 1;
+
+    for(i = basename_length - 1; i > 0; i--) {
+      if(basename[i] != argv[2][j]) {
+	break;
+      }
+      else if(j == 0) {
+        basename[i] = '\0';
+	i = 0;
+      }
+      j--;
+    }
+  }
+
+  printf("%s\n", basename);
+
+  free(basename);
+
+  return 0;
+}

dirname.c

@@ -0,0 +1,49 @@
+#include <stdio.h>
+#include <string.h>
+
+int main(int argc, char ** argv) {
+  int i, last_slash = -1, length;
+
+  if(argc == 1) {
+    printf("/\n");
+    return 0;
+  }
+
+  if(strcmp(argv[1], "//") == 0) {
+    printf("/\n");
+    return 0;
+  }
+
+  length = strlen(argv[1]);
+
+  if(argv[1][length - 1] == '/') {
+    argv[1][length - 1] = '\0';
+  }
+
+  for(i = 0; i < length; i++) {
+    if(argv[1][i] == '/') {
+      last_slash = i;
+    }
+  }
+
+  if(last_slash == -1) {
+    printf(".\n");
+    return 0;
+  }
+
+  argv[1][last_slash] = '\0';
+
+  if(strcmp(argv[1], "//") == 0 || strcmp(argv[1], "") == 0 ||
+     strcmp(argv[1], "/") == 0) {
+    printf("/\n");
+    return 0;
+  }
+
+  for(i = last_slash - 1; argv[1][i] == '/'; i--) {
+    argv[1][i] = '\0';
+  }
+
+  printf("%s\n", argv[1]);
+
+  return 0;
+}

false.c

@@ -0,0 +1,3 @@
+int main() {
+  return -1;
+}

link.c

@@ -0,0 +1,17 @@
+#include <unistd.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+int main(int argc, char * argv[]) {
+  if(argc < 3) {
+    fprintf(stderr, "%s: missing file operand\n", argv[0]);
+    exit(1);
+  }
+
+  if(argc > 3) {
+    fprintf(stderr, "%s: extra operand specified\n", argv[0]);
+    exit(1);
+  }
+
+  return link(argv[1], argv[2]);
+}

true.c

@@ -0,0 +1,3 @@
+int main() {
+  return 0;
+}