9base

revived minimalist port of Plan 9 userland to Unix
git clone git://git.suckless.org/9base
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needsrcquote.c (151B)

      1 #include <u.h>
      2 #include <libc.h>
      3 
      4 int
      5 needsrcquote(int c)
      6 {
      7 	if(c <= ' ')
      8 		return 1;
      9 	if(strchr("`^#*[]=|\\?${}()'<>&;", c))
     10 		return 1;
     11 	return 0;
     12 }