1 files changed, 94 insertions, 0 deletions
diff --git a/startmode.c b/startmode.c
new file mode 100644
index 0000000..7c1e5fd
--- /dev/null
+++ b/startmode.c
@@ -0,0 +1,94 @@
+#include <stdlib.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <string.h>
+#include <errno.h>
+#include "7ed.h"
+
+int startmode(char filename[]) {
+
+    size_t Flines;
+    int returnval = COUNT_LINES_IN_FILE(filename, &Flines);
+    if (returnval == 1) {
+        return EXIT_FAILURE;
+    }
+    fprintf(stdout,"%s %ld lines\n", filename, Flines);
+
+    long focus = 1;
+
+    while(1) {
+
+        fprintf(stdout, "(%ld): ", focus);
+        char command = getchar();
+        if (command == '\n') { 
+            continue; 
+        }
+        while ('\n' != getchar());
+        
+        switch (command) {
+            case 'L':
+            case 'l':
+                long Lfocus;
+                char buf[1024];
+                int success;
+
+                do {
+                    fprintf(stdout, "(L): ");
+                    if (!fgets(buf, 1024, stdin)) {
+                        fprintf(stderr, "Too many characters\n");
+                        break;
+                    }
+                    char *endptr;
+
+                    Lfocus = strtol(buf, &endptr, 10);
+                    errno = 0;
+                    if (errno == ERANGE) {
+                        printf("Sorry, this number is too small or too large.\n");
+                        success = 0;
+                    }
+                    else if (endptr == buf) {
+                        // no character was read
+                        success = 0;
+                    }
+                    else if (*endptr && *endptr != '\n') {
+                        // *endptr is neither end of string nor newline,
+                        // so we didn't convert the *whole* input
+                        success = 0;
+                    }
+
+                    else {
+                        success = 1;
+                    }
+
+                } while (!success);
+
+                if (Lfocus < 1 || Lfocus > (long)Flines) {
+                    fprintf(stdout, "L is either less than 1 or more than %ld\n", Flines);
+                } else {
+                    focus = Lfocus;
+                }
+
+            break;
+            case 'P':
+            case 'p':
+                print_7ed();
+                
+            break;
+            case 'E':
+            case 'e':
+                printf("EDIT MODE\n");
+            break;
+            case 'Q':
+            case 'q':
+                return EXIT_SUCCESS;
+            break;
+            default:
+                printf("?\n");
+        }
+
+
+
+    }
+    
+    return EXIT_SUCCESS;
+}
+\ No newline at end of file