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1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | * wfopen_input implementation for busybox
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4 | *
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5 | * Copyright (C) 2003 Manuel Novoa III <mjn3@codepoet.org>
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6 | *
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7 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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8 | */
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9 |
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10 | /* A number of applets need to open a file for reading, where the filename
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11 | * is a command line arg. Since often that arg is '-' (meaning stdin),
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12 | * we avoid testing everywhere by consolidating things in this routine.
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13 | *
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14 | * Note: we also consider "" to mean stdin (for 'cmp' at least).
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15 | */
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16 |
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17 | #include "libbb.h"
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18 |
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19 | FILE *fopen_or_warn_stdin(const char *filename)
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20 | {
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21 | FILE *fp = stdin;
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22 |
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23 | if (filename != bb_msg_standard_input
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24 | && filename[0]
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25 | && NOT_LONE_DASH(filename)
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26 | ) {
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27 | fp = fopen_or_warn(filename, "r");
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28 | }
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29 |
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30 | return fp;
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31 | }
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