From e5fc4ed9fb277d92ee24cd8e1bf5e305eb8e18f4 Mon Sep 17 00:00:00 2001
From: KatolaZ <katolaz@freaknet.org>
Date: Thu, 3 May 2018 22:53:01 +0100
Subject: implemented REGEXP match on addresses

---
 TODO.org | 11 +++++++----
 buff.c   | 59 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 buff.h   |  1 +
 main.c   | 40 +++++++++++++++++++++++++++++-----------
 4 files changed, 96 insertions(+), 15 deletions(-)

diff --git a/TODO.org b/TODO.org
index f409a75..b4fcbbf 100644
--- a/TODO.org
+++ b/TODO.org
@@ -7,8 +7,6 @@
 
 
 * IN-PROGRESS Commands [3/21]
-** DONE c
-** DONE w
 ** IN-PROGRESS e
 ** TODO W
 ** TODO E
@@ -27,14 +25,19 @@
 ** TODO !
 ** TODO r !
 ** TODO w !
+** DONE c
+** DONE w
 ** DONE f
 
 
-* IN-PROGRESS Addresses [4/7]
+* IN-PROGRESS Addresses [7/9]
 ** TODO Test , extensively
+** DONE ?RE?
+** DONE /RE/
+*** DONE FIXME: it does not work if the second separator is missing
 ** DONE numbers
 ** DONE ,
 ** DONE $
-** TODO .
+** DONE .
 ** DONE ;
 ** TODO  Offsets (+-)
diff --git a/buff.c b/buff.c
index 89ca82f..aa66a67 100644
--- a/buff.c
+++ b/buff.c
@@ -1,4 +1,5 @@
 #include "buff.h"
+#include <regex.h>
 
 line_t* __search_pos(int addr){
   
@@ -108,6 +109,8 @@ void print_lines(char lineno){
 
 int move_to_line(int addr, char print){
 
+  fprintf(stderr, " >>>> move_to_line: addr: %d pos: %d\n", addr, pos);
+  
   if (addr > num)
     return -1;
   else if (addr >= 0){
@@ -307,3 +310,59 @@ int write_lines(){
   printf("%d\n", tot);
   return 0;
 }
+
+/* match either forward (bw=0) or backward (bw=1)*/
+int match(char **c, char bw){
+  
+  char sep = **c, *tmp;
+  line_t *ptr;
+  regex_t re;
+  int l;
+
+  if (bw)
+    tmp = strtok(*c, "?\n");
+  else
+    tmp = strtok(*c, "/\n");
+  fprintf(stderr, "  >>>> string to match: \"%s\" bw: %d\n", tmp, bw);
+  if (!tmp)
+    return -1;
+
+  if (regcomp(&re, tmp, REG_EXTENDED)){
+    return -1;
+  }
+  *c += strlen(tmp);
+  l = pos;
+  ptr = cur;
+  do {
+    fprintf(stderr, ".");
+    if (bw){
+      ptr = ptr->prev;
+      l = (l-1 + num) % num;
+      if (!ptr){
+        /* FIXME: if we keep b_end updated we can avoid this search */
+        ptr = __search_pos(num);
+        l = num;
+      }
+    }
+    else{
+      ptr = ptr->next;
+      l = (l+1) % num;
+      if (! ptr){
+        ptr = b_start;
+        l = 1;
+      }
+    }
+    if (!l) l = num;
+    if (!regexec(&re, (char *) ptr->c , (size_t) 0, NULL, 0)){
+      regfree(&re);
+      return l;
+    }
+    fprintf(stderr, "     %d\n", l);
+  } while(l != pos);
+  fprintf(stderr, "    >>>> match: returning\n");
+  regfree(&re);
+  return -1;
+}
+
+
+
diff --git a/buff.h b/buff.h
index 7745518..2602434 100644
--- a/buff.h
+++ b/buff.h
@@ -36,6 +36,7 @@ void insert_lines();
 void delete_lines();
 int write_lines();
 int read_file();
+int match(char **, char);
 
 
 #endif /* __BUFF_H__ */
diff --git a/main.c b/main.c
index 1718a5b..5b58011 100644
--- a/main.c
+++ b/main.c
@@ -4,7 +4,8 @@
 #include "buff.h"
 #include <ctype.h>
 
-
+#define FW 0
+#define BW 1
 
 line_t *b_start = NULL;
 line_t *b_end = NULL;
@@ -26,7 +27,7 @@ const char* skip_blank(const char **c){
 int get_addr(const char **cmd){
 
   int addr, n, got;
-  char sign = 0, comma = 0, semic = 0;
+  char sign = 0, comma = 0, semic = 0, DIR = FW;
   const char *c;
   
   addr1 = addr2 = -1;
@@ -76,6 +77,20 @@ int get_addr(const char **cmd){
           return -1;
         }
         break;
+      case '?': DIR = BW;
+      case '/':
+        c++;
+        addr = match((char**) &c, DIR);
+        DIR = FW;
+        if (addr == -1){
+          return -1;
+        }
+        if (addr1 == -1)
+          addr1 = addr;
+        else
+          addr2 = addr1, addr1 = addr;
+        fprintf(stderr, "    match (%d): addr1: %d addr2: %d pos: %d\n", DIR, addr1, addr2, pos);
+        break;
       default:
         goto check;
       }
@@ -231,13 +246,19 @@ void main_loop(){
       else
         E;
       break;
+    case '\0':
     case '\n':
-      if (addr1 > -1 && addr1 <=pos)
-        move_to_line(addr1, 1);
-      else if (addr2 <=pos)
-        print_cur_line(p);
-      else
+      fprintf(stderr, ">>>> void command\n");
+      if (ret < -1 )
         E;
+      else {
+        if (addr1 > -1 && addr1 <=num)
+          move_to_line(addr1, 1);
+        else if (addr2 <=pos)
+          print_cur_line(p);
+        else
+          E;
+      }
       break;
     case 'q':
       goto cleanup;
@@ -280,11 +301,8 @@ int main(int argc, char *argv[]){
   if (argc > 1){
     fname = malloc((strlen(argv[1])+1) * sizeof(char));
     memcpy(fname, argv[1], strlen(argv[1]) + 1);
-    if (!read_file())
-      fclose(fin);
-    else{
+    if (read_file())
       perror(fname);
-    }
   }
   main_loop();
   addr1 = pos, addr2 = 1;
-- 
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