inital commit most of the current utils don't work

6 files changed, 145 insertions, 0 deletions

diff --git a/README.md b/README.md
new file mode 100644
index 0000000..b659731
--- /dev/null
+++ b/README.md
@@ -0,0 +1 @@
+I rewrote some of the core utils!
diff --git a/cat.c b/cat.c
new file mode 100644
index 0000000..74121b7
--- /dev/null
+++ b/cat.c
@@ -0,0 +1,22 @@
+#include <stdio.h>
+
+int main(int argc, char *argv[])
+{
+  FILE *f;
+  char c;
+
+  for (int i = 1; i < argc; i++) {
+    f = fopen(argv[i], "r");
+
+    if (f == NULL) {
+      fprintf(stderr, "Cannot read input file \"%s\"\n", argv[i]);
+      return 1;
+    }
+
+    do {
+      c = fgetc(f);
+      printf("%c", c);
+    } while (c != EOF);
+    fclose(f);
+  }
+}
diff --git a/ls.c b/ls.c
new file mode 100644
index 0000000..630ee4a
--- /dev/null
+++ b/ls.c
@@ -0,0 +1,34 @@
+#include <dirent.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+
+int main(int argc, char *argv[])
+{
+  DIR *d;
+  char *dirs;
+  struct dirent *dir;
+  int hidden = 1;
+  int c;
+
+  while ((c = getopt(argc, argv, "a")) != -1) {
+    switch (c) {
+      case 'a': hidden = 0; break;
+    }
+  }
+
+  if (argc > 0) {
+    for (int i = 1; i < argc; i++) {
+      dirs = argv[i];
+      if ((d = opendir(dirs))) {
+        while ((dir = readdir(d)) != NULL) {
+          if (strncmp(dir->d_name, ".", 1) != 0 && hidden) /* dont print hidden files */
+            printf("%s\n", dir->d_name);
+          else if (!hidden)
+            printf("%s\n", dir->d_name);
+        }
+        closedir(d); 
+      }
+    }
+  }
+}
diff --git a/rm.c b/rm.c
new file mode 100644
index 0000000..e2c1dfc
--- /dev/null
+++ b/rm.c
@@ -0,0 +1,67 @@
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+
+/* TODO make a recursive flag */
+
+int rm(char *fn, int frc, int ask, int expAsk);
+
+int
+rm(char *fn, int frc, int ask, int prompt)
+{
+  FILE *f;
+  int sz;
+  char yn;
+
+  /* get length of fn and check if it exists */
+  if ((f = fopen(fn, "r"))) {
+    fseek(f, 0L, SEEK_END);
+    sz = ftell(f);
+  } else {
+    fprintf(stderr, "fn '%s' doesn't exist!\n", fn);
+    return 1;
+  }
+
+  /* confirm deletion(s) when ask is on, and size is over 0 */
+  if (prompt && !frc || (ask && sz > 0)) {
+    printf("Do you want to delete %s? ", fn);
+    yn = getchar();
+
+    if (yn == 'y')
+      remove(fn);
+  } else
+    remove(fn);
+
+  return 0;
+}
+
+int
+main(int argc, char *argv[])
+{
+  int ask = 1; /* confirm deletion */
+  int prompt = 0; /* explicitly confirm deletion */
+  int frc = 0; /* force deletion */
+  int c;
+
+	while ((c = getopt(argc, argv, "efh")) != -1) {
+    switch (c) {
+      case 'i': prompt = 1; break;
+      case 'f': frc = 1; ask = 0; break;
+      case 'h': goto usage; break;
+      default: printf("run %s -h for help\n", argv[0]); return 1; break;
+    }
+	}
+
+  /* for each argument */
+  for (int i = 1; i < argc; i++) {
+    if (strncmp(argv[i], "-", 1) == 0) /* ignore args that start with - */
+      i++;
+    rm(argv[i], frc, ask, prompt);
+  }
+
+  return 0;
+
+usage:
+  printf("Usage: %s -option(s) file(s)\n", argv[0]);
+  printf("\n\t-i prompt user for deletion of every file\n\t-f force deletion, does not ask for confirmation\n\t-h shows this help message\n");
+}
diff --git a/sleep.c b/sleep.c
new file mode 100644
index 0000000..0f1d9e3
--- /dev/null
+++ b/sleep.c
@@ -0,0 +1,9 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+int main(int argc, char *argv[])
+{
+  if (argc > 0)
+    sleep(atoi(argv[1]));
+}
diff --git a/touch.c b/touch.c
new file mode 100644
index 0000000..19b9ed7
--- /dev/null
+++ b/touch.c
@@ -0,0 +1,12 @@
+#include <stdio.h>
+
+int main(int argc, char *argv[])
+{
+  FILE *f;
+
+  for (int i = 1; i < argc; i++) {
+    f = fopen(argv[i], "a");
+    fprintf(f, "\n"); /* TODO make this actually work without writing anything to the file*/
+    fclose(f);
+  }
+}