Add man pages

Signed-off-by: Mattias Andrée <maandree@kth.se>

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+.TH LIBSIMPLE_STRNCHR_INV 3 2018-11-25 libsimple
+.SH NAME
+libsimple_strnchr_inv \- find a different character in a string
+.SH SYNOPSIS
+.nf
+#include <libsimple.h>
+
+char *libsimple_strnchr_inv(const char *\fIs\fP, int \fIc\fP, size_t \fIn\fP);
+
+#ifndef strnchr_inv
+# define strnchr_inv libsimple_strnchr_inv
+#endif
+.fi
+.PP
+Link with
+.IR \-lsimple .
+.SH DESCRIPTION
+The
+.BR libsimple_strnchr_inv ()
+function scans the string
+.IR s ,
+truncated to
+.I n
+bytes unless it is shorter,
+for the first occurence of any character
+other than
+.I c
+(it is converted to a
+.BR char ).
+If no such character exist in the string,
+the string's end is returned.
+.PP
+The comparison is case-sensitive.
+.SH RETURN VALUE
+The
+.BR libsimple_strnchr_inv ()
+function returns the pointer
+.I s
+with a minimal offset such that
+.IR *r!=c ,
+where
+.I r
+is the returned pointer, if no such
+offset less than
+.I n
+exists, it returns
+.BR NULL .
+.SH ERRORS
+The
+.BR libsimple_strnchr_inv ()
+function cannot fail.
+.SH ATTRIBUTES
+For an explanation of the terms used in this section, see
+.BR attributes (7).
+.TS
+allbox;
+lb lb lb
+l l l.
+Interface	Attribute	Value
+T{
+.BR libsimple_strnchr_inv ()
+T}	Thread safety	MT-Safe
+T{
+.BR libsimple_strnchr_inv ()
+T}	Async-signal safety	AS-Safe
+T{
+.BR libsimple_strnchr_inv ()
+T}	Async-cancel safety	AC-Safe
+.TE
+.SH EXAMPLES
+None.
+.SH APPLICATION USAGE
+None.
+.SH RATIONALE
+None.
+.SH FUTURE DIRECTIONS
+None.
+.SH NOTES
+None.
+.SH BUGS
+None.
+.SH SEE ALSO
+.BR libsimple_strnchr (3),
+.BR libsimple_strnchrnul_inv (3),
+.BR libsimple_strncasechr_inv (3),
+.BR libsimple_strrnchr_inv (3),
+.BR libsimple_strchr_inv (3),
+.BR libsimple_memchr_inv (3)