new function is_in_range.

diff --git a/lib/args.h b/lib/args.h
index 2d5c661..f8cda88 100644 (file)
--- a/lib/args.h
+++ b/lib/args.h
@@ -115,4 +115,79 @@ int args_long2shortoption(struct options_t*options, char*name, char*val)
     exit(1);
 }
 
+/* check whether the value t is in a given range.
+  examples: 3 is in range 1-10: true
+            7 is in range 2-4,6,8-10: false
+           9 is in range 1,2,3-12: true
+*/
+char is_in_range(int t, char*irange)
+{
+    char*pos = irange;
+    char*digits;
+    int num;
+    char range = 0;
+    int last=0;
+    char tmp;
+
+    if(!irange)  // no range resembles (-OO,OO)
+       return 1;
+
+    while(*pos)
+    {
+       while(*pos == ' ' || *pos == '\r' || *pos == '\n' || *pos == '\t')
+           pos++;
+
+       digits = pos;
+       while(*digits>='0' && *digits<='9')
+           digits++;
+       if(digits == pos) {
+           fprintf(stderr, "Error: \"%s\" is not a valid format (digit expected)\n",irange);
+           exit(1);
+        }
+       
+       tmp=*digits;*digits=0;
+       num = atoi(pos);
+       *digits=tmp;
+       pos = digits;
+
+       while(*pos == ' ' || *pos == '\r' || *pos == '\n' || *pos == '\t')
+           pos++;
+
+       if(range && last<=t && num>=t)
+           return 1;
+       if(range) {
+           range = 0;
+           if(*pos)
+            pos ++;
+           continue;
+       }
+
+       if(*pos=='-')
+       {
+           if(range) {
+               fprintf(stderr, "Error: \"%s\" is not a valid format (too many '-'s)\n",irange);
+               exit(1);
+           }
+           last = num;
+           range = 1;
+           if(*pos)
+            pos ++;
+           continue;
+       } 
+       else 
+       {
+           /* if it isn't a '-', we assume it is a seperator like
+              ',', ';', ':', whatever. */
+           if(t == num)
+               return 1;
+           if(*pos)
+            pos ++;
+           continue;
+       }
+    }
+    if(range && last<=t)
+       return 1;
+    return 0;
+}
+
 #endif //__args_h__