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108 lines
2.1 KiB
Groff
108 lines
2.1 KiB
Groff
.\" $NetBSD: openpam_straddch.3,v 1.5 2014/10/24 18:25:14 christos Exp $
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.\"
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.\" Generated from openpam_straddch.c by gendoc.pl
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.\" Id: openpam_straddch.c 648 2013-03-05 17:54:27Z des
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.Dd September 12, 2014
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.Dt OPENPAM_STRADDCH 3
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.Os
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.Sh NAME
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.Nm openpam_straddch
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.Nd add a character to a string, expanding the buffer if needed
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.Sh LIBRARY
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.Lb libpam
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.Sh SYNOPSIS
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.In sys/types.h
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.In security/pam_appl.h
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.In security/openpam.h
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.Ft "int"
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.Fn openpam_straddch "char **str" "size_t *size" "size_t *len" "int ch"
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.Sh DESCRIPTION
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The
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.Fn openpam_straddch
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function appends a character to a dynamically
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allocated NUL-terminated buffer, reallocating the buffer as needed.
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.Pp
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The
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.Fa str
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argument points to a variable containing either a pointer to
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an existing buffer or
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.Dv NULL .
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If the value of the variable pointed to by
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.Fa str
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is
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.Dv NULL ,
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a new buffer
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is allocated.
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.Pp
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The
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.Fa size
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and
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.Fa len
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argument point to variables used to hold the size
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of the buffer and the length of the string it contains, respectively.
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.Pp
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The final argument,
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.Fa ch ,
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is the character that should be appended to
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the string. If
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.Fa ch
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is 0, nothing is appended, but a new buffer is
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still allocated if
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.Fa str
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is NULL. This can be used to
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.Do
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bootstrap
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.Dc
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the
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string.
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.Pp
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If a new buffer is allocated or an existing buffer is reallocated to
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make room for the additional character,
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.Fa str
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and
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.Fa size
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are updated
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accordingly.
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.Pp
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The
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.Fn openpam_straddch
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function ensures that the buffer is always
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NUL-terminated.
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.Pp
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If the
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.Fn openpam_straddch
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function is successful, it increments the
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integer variable pointed to by
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.Fa len
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(unless
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.Fa ch
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was 0) and returns 0.
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Otherwise, it leaves the variables pointed to by
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.Fa str ,
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.Fa size
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and
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.Fa len
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unmodified, sets
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.Va errno
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to
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.Dv ENOMEM
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and returns -1.
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.Pp
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.Sh RETURN VALUES
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The
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.Fn openpam_straddch
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function returns 0 on success and -1 on failure.
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.Sh SEE ALSO
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.Xr pam 3 ,
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.Xr pam_strerror 3
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.Sh STANDARDS
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The
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.Fn openpam_straddch
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function is an OpenPAM extension.
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.Sh AUTHORS
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The
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.Fn openpam_straddch
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function and this manual page were
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developed by
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.An Dag-Erling Sm\(/orgrav Aq Mt des@des.no .
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