Add man pages for memdup, aligned_memdup, strdup and strndup functions, and fix strndupa

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

1 files changed, 119 insertions, 0 deletions

diff --git a/man/libsimple_enstrndup.3 b/man/libsimple_enstrndup.3
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+++ b/man/libsimple_enstrndup.3
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+.TH LIBSIMPLE_ENSTRNDUP 3 2018-10-27 libsimple
+.SH NAME
+libsimple_enstrndup \- duplicate the beginning of a string
+.SH SYNOPSIS
+.nf
+#include <libsimple.h>
+
+char *libsimple_strndupa(const char *\fIs\fP, size_t \fIn\fP);
+char *libsimple_enstrndup(int \fIstatus\fP, const char *\fIs\fP, size_t \fIn\fP);
+static inline char *libsimple_estrndup(const char *\fIs\fP, size_t \fIn\fP);
+
+#ifndef strndupa
+# define strndupa libsimple_strndupa
+#endif
+#ifndef enstrndup
+# define enstrndup libsimple_enstrndup
+#endif
+#ifndef estrndup
+# define estrndup libsimple_estrndup
+#endif
+.fi
+.PP
+Link with
+.IR \-lsimple .
+.SH DESCRIPTION
+The
+.BR libsimple_enstrndup ()
+and
+.BR libsimple_estrndup ()
+functions are versions of the
+.BR strndup (3)
+function that call the
+.BR libsimple_enprintf (3)
+function on failure, causing the process to print
+an error message and exit. See
+.BR libsimple_enprintf (3)
+for more information.
+.PP
+The
+.BR libsimple_strndupa ()
+function is implemented as a macro and is a version
+of the
+.BR strndup (3)
+function that uses allocates the memory on the stack
+rather than on the heap, causing the return pointer
+to become invalid when the calling function returns.
+.SH RETURN VALUE
+Upon successful completion, the
+.BR libsimple_strndupa (),
+.BR libsimple_enstrndup (),
+and
+.BR libsimple_estrndup ()
+functions return a non-null pointer, on failure the
+.BR libsimple_enstrndup (),
+and
+.BR libsimple_estrndup ()
+functions exit the process group. The
+.BR libsimple_strndupa ()
+function cannot fail, however the kernel
+can kill the process with a
+.B SIGSEGV
+signal if the memory cannot be allocated.
+.PP
+The returned pointer should be deallocated when it
+is no longer needed, except for the pointer returned
+by the
+.BR libsimple_strndupa ()
+function, it is automatically deallocated when the
+calling function returns.
+.SH ERRORS
+None.
+.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_strndupa (),
+.br
+.BR libsimple_enstrndup (),
+.br
+.BR libsimple_estrndup (),
+T}	Thread safety	MT-Safe
+T{
+.BR libsimple_strndupa (),
+.br
+.BR libsimple_enstrndup (),
+.br
+.BR libsimple_estrndup (),
+T}	Async-signal safety	AS-Safe
+T{
+.BR libsimple_strndupa (),
+.br
+.BR libsimple_enstrndup (),
+.br
+.BR libsimple_estrndup (),
+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_enstrdup (3),
+.BR libsimple_memdup (3),
+.BR libsimple_aligned_memdup (3),
+.BR strndup (3),
+.BR strdup (3)