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-.\" -*-nroff-*-
-.TH versioncmp 3 "6 January 2007" "Straylight/Edgeware" "mLib utilities library"
-.SH NAME
-versioncmp \- compare Debian-format version numbers
-.\" @versioncmp
-.SH SYNOPSIS
-.nf
-.B "#include <mLib/versioncmp.h>"
-
-.BI "int versioncmp(const char *" va ", const char *" vb ");"
-.fi
-.SH DESCRIPTION
-The
-.B versioncmp
-function compares version strings.
-.PP
-The format of version numbers considered is
-.IP
-.RI [ epoch
-.BR : ]
-.I main
-.RB [ \-
-.IR sub ]
-.PP
-The
-.I main
-part may contain colons or hyphens if there is an
-.I epoch
-or
-.IR sub ,
-respectively.  Version strings are compared componentwise: first epochs,
-then main parts, and finally subparts.
-.PP
-The component comparison is done as follows.  First, the initial
-subsequence of nondigit characters is extracted from each string, and
-these are compared lexicographically, using ASCII ordering, except that
-letters precede non-letters.  If both are the same, an initial sequence
-of digits is extracted from the remaining parts of the version strings,
-and these are compared numerically (an empty sequence being considered
-to have the value zero).  This process is repeated until we have a
-winner or until both strings are exhausted.
-.PP
-The return value is 0 if the two strings are equal, \-1 if
-.I va
-is older than
-.IR vb ,
-or +1 if
-.I va
-is newer than
-.IR vb .
-.SH SEE ALSO
-.BR mLib (3).
-.PP
-.IR "Debian Policy Manual" .
-.SH AUTHOR
-Mark Wooding, <mdw@distorted.org.uk>