* strings.h (strechr): New function.

* uinfo.cc (pwdgrp::next_str): Search only for input char in string.  Return
EOS on failure.  Don't check for NULL since it shouldn't be possible.
(pwdgrp::add_line): Revert to replacing '\n' in input line with '\0'.
(pwdgrp::next_num): Pass explicit separator character to next_str.
* grp.cc (pwdgrp::parse_group): Ditto.
* passwd.cc (pwdgrp::parse_passwd): Ditto.  Revamp test for garbage input.
* pwdgrp.h (pwdgrp::next_str): Don't use default parameter.

winsup/cygwin/string.h

@@ -38,6 +38,27 @@ strchr (const char *s, int c)
   return res;
 }
 
+#undef strechr
+#define strechr cygwin_strechr
+static inline __stdcall char *
+strechr (const char *s, int c)
+{
+  register char * res;
+  __asm__ __volatile__ ("\
+	movb	%%al,%%ah\n\
+1:	movb	(%1),%%al\n\
+	cmpb	%%ah,%%al\n\
+	je	2f\n\
+	incl	%1\n\
+	testb	%%al,%%al\n\
+	jne	1b\n\
+	decl	%1\n\
+2:	movl	%1,%0\n\
+	":"=a" (res), "=r" (s)
+	:"0" (c), "1" (s));
+  return res;
+}
+
 extern const char isalpha_array[];
 
 #undef strcasematch