Chinaunix

标题: The Summarize of getopt() Function in POSIX [打印本页]

作者: yifei_wang 时间: 2011-10-18 22:56
标题: The Summarize of getopt() Function in POSIX
Format:
int getopt(int argc, char *const argv[], const char *optstring);

extern char *optarg;
extern int optind, opterr, optopt;

global variables:
1. optind:
a. the index of the next element to be processed in argv.
b. initialized to 1: at the beginning or scan a new argument vector.
2. opterr:
a. the return value is '?' when getopt() didn't recognize the option character.
b. when set to 0, it may prevent the error message to print.
3. optopt:
a. store the illegal option

rules:
1. argument:
a. optstring
1. contained the legitimate optons characters.
2. character which followed by a colon requires an argument.
* 3. two colons mean an option takes an optional arg.
4. "-oarg" means "-o arg" (GNU extension)
5. "W;" --> "-W foo" means "--foo"
6. '+' in the first character of optstring or the evironment variable POSIXLY_CORRECT is set, option processing stops as soon as s nooption argument is encountered.
7. '-' in the first character, each nonoption argv-element is handled as if it were the argument of an option with character code 1

2. return value:
a. return '?':
1. encounter illegal option
2. detect a missing option argument (the first character of optstring isn't a colon)
b. return ':':
1. detect a missing option argument, and the first charater of optstring is a colon.
c. return -1:
1. all command-line options have been parsed.
d. return option character:
1. option was successfully found.

作者: yifei_wang 时间: 2011-10-19 11:01
本帖最后由 yifei_wang 于 2011-10-19 18:08 编辑

fix the lib function "getopt()":
1. remove the fourth argument;
2. add two error processing conditions;
3. update the coding style.

0001-fix-the-lib-function-getopt.patch.tar.bz2 (10 KB, 下载次数: 36)

作者: 陈思明 时间: 2011-10-19 17:26
Fix getopt() function of fold "boot", "disk", "display".

boot_disk_display_fix.patch.tar.bz2 (1.63 KB, 下载次数: 41)

作者: wangyyet 时间: 2011-10-19 17:37
本帖最后由 wangyyet 于 2011-10-19 17:40 编辑

The patch of serial, shell and sysconf

serial_shell_sysconf_fix.patch.bz2 (966 Bytes, 下载次数: 24)

作者: zkw0320 时间: 2011-10-19 17:42
fix "memory","misc","net"

mem_misc_net.fix.tar.bz2

10 KB, 下载次数: 15

作者: dongshengzou 时间: 2011-10-19 18:27

flash_fs_led_fix.patch.tar.bz2 (859 Bytes, 下载次数: 21)
flash, fs, led patch.
only document "flash" calls the function getopt().

作者: yifei_wang 时间: 2011-10-19 18:35
update the using of "getopt()" function in each app

0001-update-the-using-of-getopt-function-in-each-app.patch.tar.bz2 (20 KB, 下载次数: 27)

欢迎光临 Chinaunix (http://bbs.chinaunix.net/)