Binary String to Integer Conversion

 // chrissie 10.2009
 // Binary String to Integer conversion
 #include <stdio.h>

 //
 // convert a binary string into dezimal values
 //
 int binary (char *c) {
     int bval=0;
     for (;*c;c++){
         if (*c<'0'||*c>'1') return -1;
         bval<<=1;
         if (*c=='1') bval |=1;
     }
     return bval;
 }


 //
 // main program
 //
 int main (void) {
     int w;
     char *s="1011001";
     //char *s="1001";
     w = binary(s);
     printf("Bin: %s\n",s);
     printf("Dez: %i\n",w);
 }