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authorDenis Vlasenko2006-11-24 21:54:44 +0000
committerDenis Vlasenko2006-11-24 21:54:44 +0000
commitd031ffa623203b1dc756a1e02e06f261fdc30872 (patch)
tree26f4426eba02d3b7f22da62ef3af151a89c99e3f /libbb/getopt32.c
parentb833ca9d2d705943bb980c7a705aa3f07c7b5618 (diff)
downloadbusybox-d031ffa623203b1dc756a1e02e06f261fdc30872.zip
busybox-d031ffa623203b1dc756a1e02e06f261fdc30872.tar.gz
tar: sanitize option handling
Diffstat (limited to 'libbb/getopt32.c')
-rw-r--r--libbb/getopt32.c68
1 files changed, 34 insertions, 34 deletions
diff --git a/libbb/getopt32.c b/libbb/getopt32.c
index f442933..dddf812 100644
--- a/libbb/getopt32.c
+++ b/libbb/getopt32.c
@@ -147,6 +147,40 @@ const char *opt_complementary
Special characters:
+ "-" A dash as the first char in a opt_complementary group forces
+ all arguments to be treated as options, even if they have
+ no leading dashes. Next char in this case can't be a digit (0-9),
+ use ':' or end of line. For example:
+
+ opt_complementary = "-:w-x:x-w";
+ getopt32(argc, argv, "wx");
+
+ Allows any arguments to be given without a dash (./program w x)
+ as well as with a dash (./program -x).
+
+ "--" A double dash at the beginning of opt_complementary means the
+ argv[1] string should always be treated as options, even if it isn't
+ prefixed with a "-". This is useful for special syntax in applets
+ such as "ar" and "tar":
+ tar xvf foo.tar
+
+ "-N" A dash as the first char in a opt_complementary group followed
+ by a single digit (0-9) means that at least N non-option
+ arguments must be present on the command line
+
+ "=N" An equal sign as the first char in a opt_complementary group followed
+ by a single digit (0-9) means that exactly N non-option
+ arguments must be present on the command line
+
+ "?N" A "?" as the first char in a opt_complementary group followed
+ by a single digit (0-9) means that at most N arguments must be present
+ on the command line.
+
+ "V-" An option with dash before colon or end-of-line results in
+ bb_show_usage being called if this option is encountered.
+ This is typically used to implement "print verbose usage message
+ and exit" option.
+
"-" A dash between two options causes the second of the two
to be unset (and ignored) if it is given on the command line.
@@ -173,30 +207,6 @@ Special characters:
if (opt & 4)
printf("Detected odd -x usage\n");
- "-" A dash as the first char in a opt_complementary group forces
- all arguments to be treated as options, even if they have
- no leading dashes. Next char in this case can't be a digit (0-9),
- use ':' or end of line. For example:
-
- opt_complementary = "-:w-x:x-w";
- getopt32(argc, argv, "wx");
-
- Allows any arguments to be given without a dash (./program w x)
- as well as with a dash (./program -x).
-
- "-N" A dash as the first char in a opt_complementary group followed
- by a single digit (0-9) means that at least N non-option
- arguments must be present on the command line
-
- "=N" An equal sign as the first char in a opt_complementary group followed
- by a single digit (0-9) means that exactly N non-option
- arguments must be present on the command line
-
- "V-" An option with dash before colon or end-of-line results in
- bb_show_usage being called if this option is encountered.
- This is typically used to implement "print verbose usage message
- and exit" option.
-
"--" A double dash between two options, or between an option and a group
of options, means that they are mutually exclusive. Unlike
the "-" case above, an error will be forced if the options
@@ -221,10 +231,6 @@ Special characters:
if BB_GETOPT_ERROR is detected, don't return, call bb_show_usage
and exit instead. Next char after '?' can't be a digit.
- "?N" A "?" as the first char in a opt_complementary group followed
- by a single digit (0-9) means that at most N arguments must be present
- on the command line.
-
"::" A double colon after a char in opt_complementary means that the
option can occur multiple times. Each occurrence will be saved as
a llist_t element instead of char*.
@@ -245,12 +251,6 @@ Special characters:
root:x:0:0:root:/root:/bin/bash
user:x:500:500::/home/user:/bin/bash
- "--" A double dash at the beginning of opt_complementary means the
- argv[1] string should always be treated as options, even if it isn't
- prefixed with a "-". This is useful for special syntax in applets
- such as "ar" and "tar":
- tar xvf foo.tar
-
"?" An "?" between an option and a group of options means that
at least one of them is required to occur if the first option
occurs in preceding command line arguments.