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The option parser takes argc, argv, an array of struct option and a usage string. Each of the struct option elements in the array describes a valid option, its type and a pointer to the location where the value is written. The entry point is parse_options(), which scans through the given argv, and matches each option there against the list of valid options. During the scan, argv is rewritten to only contain the non-option command line arguments and the number of these is returned. Aggregation of single switches is allowed: -rC0 is the same as -r -C 0 (supposing that -C wants an arg). Every long option automatically support the option with the same name, prefixed with 'no-' to unset the switch. It assumes that initial value for strings are "NULL" and for integers is "0". Long options are supported either with '=' or without: --some-option=foo is the same as --some-option foo Acked-by: Kristian Høgsberg <krh@redhat.com> Signed-off-by: Pierre Habouzit <madcoder@debian.org> Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
36 lines
895 B
C
36 lines
895 B
C
#ifndef PARSE_OPTIONS_H
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#define PARSE_OPTIONS_H
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enum parse_opt_type {
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OPTION_END,
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OPTION_BOOLEAN,
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OPTION_STRING,
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OPTION_INTEGER,
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};
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enum parse_opt_flags {
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PARSE_OPT_KEEP_DASHDASH = 1,
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};
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struct option {
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enum parse_opt_type type;
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int short_name;
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const char *long_name;
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void *value;
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};
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#define OPT_END() { OPTION_END }
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#define OPT_BOOLEAN(s, l, v, h) { OPTION_BOOLEAN, (s), (l), (v) }
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#define OPT_INTEGER(s, l, v, h) { OPTION_INTEGER, (s), (l), (v) }
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#define OPT_STRING(s, l, v, a, h) { OPTION_STRING, (s), (l), (v) }
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/* parse_options() will filter out the processed options and leave the
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* non-option argments in argv[].
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* Returns the number of arguments left in argv[].
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*/
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extern int parse_options(int argc, const char **argv,
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const struct option *options,
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const char *usagestr, int flags);
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#endif
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