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author | Alon Zakai <alonzakai@gmail.com> | 2011-09-24 18:41:07 -0700 |
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committer | Alon Zakai <alonzakai@gmail.com> | 2011-09-24 18:41:07 -0700 |
commit | f2a8bdc4c3bd88cb6a9ff85c4f2c43e9b9f77b97 (patch) | |
tree | 172b11e658bf266a001050bf90a029c36ac97bd2 /system/include/libc/getopt.h | |
parent | 1c8b4752414132e27abc608dda7db8dc0268f73a (diff) |
reorganize system/include
Diffstat (limited to 'system/include/libc/getopt.h')
-rw-r--r-- | system/include/libc/getopt.h | 190 |
1 files changed, 190 insertions, 0 deletions
diff --git a/system/include/libc/getopt.h b/system/include/libc/getopt.h new file mode 100644 index 00000000..ba8da4a7 --- /dev/null +++ b/system/include/libc/getopt.h @@ -0,0 +1,190 @@ +/**************************************************************************** + +getopt.h - Read command line options + +AUTHOR: Gregory Pietsch +CREATED Thu Jan 09 22:37:00 1997 + +DESCRIPTION: + +The getopt() function parses the command line arguments. Its arguments argc +and argv are the argument count and array as passed to the main() function +on program invocation. The argument optstring is a list of available option +characters. If such a character is followed by a colon (`:'), the option +takes an argument, which is placed in optarg. If such a character is +followed by two colons, the option takes an optional argument, which is +placed in optarg. If the option does not take an argument, optarg is NULL. + +The external variable optind is the index of the next array element of argv +to be processed; it communicates from one call to the next which element to +process. + +The getopt_long() function works like getopt() except that it also accepts +long options started by two dashes `--'. If these take values, it is either +in the form + +--arg=value + + or + +--arg value + +It takes the additional arguments longopts which is a pointer to the first +element of an array of type GETOPT_LONG_OPTION_T, defined below. The last +element of the array has to be filled with NULL for the name field. + +The longind pointer points to the index of the current long option relative +to longopts if it is non-NULL. + +The getopt() function returns the option character if the option was found +successfully, `:' if there was a missing parameter for one of the options, +`?' for an unknown option character, and EOF for the end of the option list. + +The getopt_long() function's return value is described below. + +The function getopt_long_only() is identical to getopt_long(), except that a +plus sign `+' can introduce long options as well as `--'. + +Describe how to deal with options that follow non-option ARGV-elements. + +If the caller did not specify anything, the default is REQUIRE_ORDER if the +environment variable POSIXLY_CORRECT is defined, PERMUTE otherwise. + +REQUIRE_ORDER means don't recognize them as options; stop option processing +when the first non-option is seen. This is what Unix does. This mode of +operation is selected by either setting the environment variable +POSIXLY_CORRECT, or using `+' as the first character of the optstring +parameter. + +PERMUTE is the default. We permute the contents of ARGV as we scan, so that +eventually all the non-options are at the end. This allows options to be +given in any order, even with programs that were not written to expect this. + +RETURN_IN_ORDER is an option available to programs that were written to +expect options and other ARGV-elements in any order and that care about the +ordering of the two. We describe each non-option ARGV-element as if it were +the argument of an option with character code 1. Using `-' as the first +character of the optstring parameter selects this mode of operation. + +The special argument `--' forces an end of option-scanning regardless of the +value of `ordering'. In the case of RETURN_IN_ORDER, only `--' can cause +getopt() and friends to return EOF with optind != argc. + +COPYRIGHT NOTICE AND DISCLAIMER: + +Copyright (C) 1997 Gregory Pietsch + +This file and the accompanying getopt.c implementation file are hereby +placed in the public domain without restrictions. Just give the author +credit, don't claim you wrote it or prevent anyone else from using it. + +Gregory Pietsch's current e-mail address: +gpietsch@comcast.net +****************************************************************************/ + +/* This is a glibc-extension header file. */ + +#ifndef GETOPT_H +#define GETOPT_H + +#include <_ansi.h> + +/* include files needed by this include file */ + +#define no_argument 0 +#define required_argument 1 +#define optional_argument 2 + +#ifdef __cplusplus +extern "C" +{ + +#endif /* __cplusplus */ + +/* types defined by this include file */ + struct option + { + char *name; /* the name of the long option */ + int has_arg; /* one of the above macros */ + int *flag; /* determines if getopt_long() returns a + * value for a long option; if it is + * non-NULL, 0 is returned as a function + * value and the value of val is stored in + * the area pointed to by flag. Otherwise, + * val is returned. */ + int val; /* determines the value to return if flag is + * NULL. */ + + }; + +/* While getopt.h is a glibc extension, the following are newlib extensions. + * They are optionally included via the __need_getopt_newlib flag. */ + +#ifdef __need_getopt_newlib + + /* macros defined by this include file */ + #define NO_ARG no_argument + #define REQUIRED_ARG required_argument + #define OPTIONAL_ARG optional_argument + + /* The GETOPT_DATA_INITIALIZER macro is used to initialize a statically- + allocated variable of type struct getopt_data. */ + #define GETOPT_DATA_INITIALIZER {0,0,0,0,0} + + /* These #defines are to make accessing the reentrant functions easier. */ + #define getopt_r __getopt_r + #define getopt_long_r __getopt_long_r + #define getopt_long_only_r __getopt_long_only_r + + /* The getopt_data structure is for reentrancy. Its members are similar to + the externally-defined variables. */ + typedef struct getopt_data + { + char *optarg; + int optind, opterr, optopt, optwhere; + } getopt_data; + +#endif /* __need_getopt_newlib */ + + /* externally-defined variables */ + extern char *optarg; + extern int optind; + extern int opterr; + extern int optopt; + + /* function prototypes */ + int _EXFUN (getopt, + (int __argc, char *const __argv[], const char *__optstring)); + + int _EXFUN (getopt_long, + (int __argc, char *const __argv[], const char *__shortopts, + const struct option * __longopts, int *__longind)); + + int _EXFUN (getopt_long_only, + (int __argc, char *const __argv[], const char *__shortopts, + const struct option * __longopts, int *__longind)); + +#ifdef __need_getopt_newlib + int _EXFUN (__getopt_r, + (int __argc, char *const __argv[], const char *__optstring, + struct getopt_data * __data)); + + int _EXFUN (__getopt_long_r, + (int __argc, char *const __argv[], const char *__shortopts, + const struct option * __longopts, int *__longind, + struct getopt_data * __data)); + + int _EXFUN (__getopt_long_only_r, + (int __argc, char *const __argv[], const char *__shortopts, + const struct option * __longopts, int *__longind, + struct getopt_data * __data)); +#endif /* __need_getopt_newlib */ + +#ifdef __cplusplus +}; + +#endif /* __cplusplus */ + +#endif /* GETOPT_H */ + +/* END OF FILE getopt.h */ |