added escape characters

class.c

@@ -11,6 +11,42 @@ int testBit(char *bits, int n)
     return bits[n/8] & (1 << n%8);
 }
 
+int isEscapedChar(char char1, char char2){
+    if( char1=='\n'){
+        return 10;
+    }
+    if( char1=='\a'){
+        return 7;
+    }
+    if( char1=='\b'){
+        return 8;
+    }
+    if( char1=='\e'){
+        return 27;
+    }
+    if( char1=='\f'){
+        return 12;
+    }
+    if( char1=='\r'){
+        return 13;
+    }
+    else if( char1=='\t'){
+        return 9;
+    }
+    if( char1=='\v'){
+        return 1;
+    }
+    else if( char1=='\\' && char2=='-'){
+        return 45;
+    }
+    else if ( char1=='\\'){
+        return 92;
+    }
+    else return ;
+    //if(character==92 || character==7 || character==8 || character==27 || character==12 || character==10 || character==13 || character==13
+    // || character==9 || character==11)
+}
+
 char *classify(char *spec)
 {
     char *class= malloc(32);	// 256 bits indicating if character N (bit position N) is in the class or not
@@ -39,12 +75,14 @@ char *classify(char *spec)
                     }   
                 }
                 else{
-                    printf("Error, aekzaepaz");
+                    printf("Error, bad use of range");
+                    exit(1);
                 }
             }
             else{
                 if(spec[index-1]>spec[index+1]){
-                printf("Error, first char greater than the second one");
+                printf("Error, first char greater than the second one\n");
+                exit(1);
                 }
                 else if(spec[index-1]>=65 && spec[index-1]<=90 && spec[index+1]>=65 && spec[index+1]<=90 ){
                     for(int j=spec[index-1]; j<=spec[index+1] ; j++){
@@ -61,12 +99,22 @@ char *classify(char *spec)
                     }
                     index++;
                 }
+                else{
+                    printf("Bad use of char range");
+                    exit(1);
+                }
             }
 
        }
        else if((spec[index]>=65 && spec[index]<=90) || (spec[index]>=97 && spec[index]<=122)){
            setBit(class,spec[index]);
            printf("added char : %c\n",spec[index]);
+       }
+       else if(isEscapedChar(spec[index],spec[index+1])!=0){
+           if(isEscapedChar(spec[index],spec[index+1])==45){
+               index++;
+           }
+           setBit(class,isEscapedChar(spec[index],spec[index+1]));
        }
         printf("%c\n",spec[index]);
         printf("%i\n",index);
@@ -87,7 +135,7 @@ int main()
     ssize_t line_len=0;
     char a='a';
     printf("%i\n",(int)a);
-    printf("%s",classify("a-cA-Z"));
+    printf("%s",classify("fgmfa\\-c"));
     while ((line_len= getline(&line,&line_max,stdin)) >= 0) {
         if (line_len>0 && line[line_len-1]=='\n') {
             line[line_len-1]=0;