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	cistrstr.c - 9base - revived minimalist port of Plan 9 userland to Unix
	git clone git://git.suckless.org/9base
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	---
	cistrstr.c (357B)
	---
	1 #include <u.h>
	2 #include <libc.h>
	3
	4 char*
	5 cistrstr(char s, char sub)
	6 {
	7 int c, csub, n;
	8
	9 csub = *sub;
	10 if(csub == '\0')
	11 return s;
	12 if(csub >= 'A' && csub <= 'Z')
	13 csub -= 'A' - 'a';
	14 sub++;
	15 n = strlen(sub);
	16 for(; c = *s; s++){
	17 if(c >= 'A' && c <= 'Z')
	18 c -= 'A' - 'a';
	19 if(c == csub && cistrncmp(s+1, sub, n) == 0)
	20 return s;
	21 }
	22 return nil;
	23 }