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/*++
/* NAME
/* line_number 3
/* SUMMARY
/* line number utilities
/* SYNOPSIS
/* #include <line_number.h>
/*
/* char *format_line_number(result, first, last)
/* VSTRING *buffer;
/* ssize_t first;
/* ssize_t lastl
/* DESCRIPTION
/* format_line_number() formats a line number or number range.
/* The output is <first-number>-<last-number> when the numbers
/* differ, <first-number> when the numbers are identical.
/* .IP result
/* Result buffer, or null-pointer. In the latter case the
/* result is stored in a static buffer that is overwritten
/* with subsequent calls. The function result value is a
/* pointer into the result buffer.
/* .IP first
/* First line number.
/* .IP last
/* Last line number.
/* LICENSE
/* .ad
/* .fi
/* The Secure Mailer license must be distributed with this software.
/* AUTHOR(S)
/* Wietse Venema
/* IBM T.J. Watson Research
/* P.O. Box 704
/* Yorktown Heights, NY 10598, USA
/*--*/
/*
* System library.
*/
#include <sys_defs.h>
/*
* Utility library.
*/
#include <vstring.h>
#include <line_number.h>
/* format_line_number - pretty-print line number or number range */
char *format_line_number(VSTRING *result, ssize_t first, ssize_t last)
{
static VSTRING *buf;
/*
* Your buffer or mine?
*/
if (result == 0) {
if (buf == 0)
buf = vstring_alloc(10);
result = buf;
}
/*
* Print a range only when the numbers differ.
*/
vstring_sprintf(result, "%ld", (long) first);
if (first != last)
vstring_sprintf_append(result, "-%ld", (long) last);
return (vstring_str(result));
}
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