first commit

1 files changed, 186 insertions, 0 deletions

diff --git a/main.c b/main.c
new file mode 100644
index 0000000..0599575
--- /dev/null
+++ b/main.c
@@ -0,0 +1,186 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include "buff.h"
+#include <ctype.h>
+
+line_t *b_start = NULL;
+line_t *b_end = NULL;
+line_t *cur = NULL;
+unsigned int num = 0;
+unsigned int pos = 0;
+/* addr1 is the lasr address, while addr2 is the previous one */
+int addr1, addr2;
+
+
+
+const char* skip_blank(const char **c){
+
+  while (isblank(**c)) (*c)++;
+  return *c;
+}
+
+
+int get_addr(const char **cmd){
+
+  int addr, n, got;
+  char sign = 0, comma = 0;
+  const char *c;
+  
+  addr1 = addr2 = -1;
+  c = *cmd;
+  while(*c){
+    c = skip_blank(&c);
+    n = 0;
+    got = 0;
+    if (isdigit(*c)){
+      while (isdigit(*c)){
+        got = 1;
+        n = n * 10 + *c - '0', c++;
+      }
+      if (got){
+        if (addr1 > -1 )
+          addr2 = addr1;
+        addr1 = n;
+      }
+    }
+    else {
+      switch(*c){
+      case '.':
+        if (addr1 > -1)
+          addr2 = addr1;
+        addr1 = pos;
+        break;
+      case '$':
+        if (addr1 > -1)
+          addr2 = addr1;
+        addr1 = num;
+        break;
+      case ',':
+        comma = 1;
+        if (addr1 < addr2){
+          *cmd = c;
+          return -1; 
+        }
+        break;
+      default:
+        goto check;
+      }
+      c++;
+    }
+  }
+ check:
+  *cmd = c;
+
+  if (addr1 == -1){
+    if (comma){
+      addr1 = num;
+      addr2 = 1;
+      return 2;
+    }
+    addr1 = addr2 = pos;
+    return 0;
+  }
+  if (addr2 == -1){
+    addr2 = pos;
+    return 1;
+  }
+  return 2;
+}
+
+
+void main_loop(){
+  
+  char *cmd;
+  int ret;
+  char p;
+  
+  cmd = malloc(256 * sizeof(char));
+  
+  while(1){
+    p = 0;
+    fgets(cmd, 255, stdin);
+    
+    ret = get_addr((const char **) &cmd);
+    
+    printf(">>> *** pos: %d address: %d ***\n", pos, ret);
+    if (ret) {
+      printf(">>>   *** addr1: %d, addr2= %d***\n", addr1, addr2);
+    }
+
+    switch(cmd[0]){
+    case 'i':
+      if (addr1 > -1)
+        move_to_line(addr1, 0);
+      insert_lines();
+      break;
+    case 'a':
+      if (addr1 > -1)
+        move_to_line(addr1, 0);
+      append_lines();
+      break;
+    case 'd':
+      delete_lines();
+      break;
+    case 'n': p = 1;
+    case 'p':
+      if (ret == 2)
+        if (addr1 < addr2){
+          printf("?\n");
+          break;
+        }
+        else
+          print_lines(p);
+      else  if (ret == 1) 
+        move_to_line(addr2, 1);
+      else if (ret == 0)
+        print_cur_line(p);
+      else if (ret == -1){
+        addr1 = num;
+        addr2 = 1;
+        move_to_line(addr2,0);
+        print_lines(p);
+      }
+      break;
+    case '\n':
+      if (addr1 > -1)
+        move_to_line(addr1, 1);
+      else
+        print_cur_line(p);
+      break;
+    case 'q':
+      exit(0);
+      break;
+    case '=':
+      if (addr1 == -1)
+        addr1 = num;
+      print_lineno();
+      break;
+    default:
+      printf(">>> **** unknown command: '%c'****\n", cmd[0])
+      ;
+    }
+  }
+}
+
+
+
+int main(int argc, char *argv[]){
+
+  FILE *fin;
+  
+  if (argc < 2){
+    printf("Usage: %s <filein>\n", argv[0]);
+    exit(1);
+  }
+  
+  if ((fin = fopen(argv[1], "r+"))){
+    read_lines(fin);
+  }
+  else{
+    printf("Error opening file %s\n", argv[1]);
+  }
+  
+  main_loop();
+}
+