01-21-2008
Please use CODE tags
,
its quite difficult to read through the code without them.
It seems that the code is pasted from editor with line numbers set
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ARG(2) System Calls Manual ARG(2)
NAME
ARGBEGIN, ARGEND, ARGC, ARGF, arginit, argopt - process option letters from argv
SYNOPSIS
#include <u.h>
#include <libc.h>
ARGBEGIN {
char *ARGF();
Rune ARGC();
} ARGEND
extern char *argv0;
/* Alef only */
Arg *arginit(int argc, byte **argv);
Rune argopt(Arg *arg);
byte *argf(Arg *arg);
DESCRIPTION
These macros assume the names argc and argv are in scope; see exec(2). ARGBEGIN and ARGEND surround code for processing program options.
The code should be the cases of a C switch on option characters; it is executed once for each option character. Options end after an argu-
ment --, before an argument -, or before an argument that doesn't begin with -.
ARGC() returns the current option character.
ARGF() returns the current option argument: a pointer to the rest of the option string if not empty, or the next argument in argv if any,
or 0. ARGF must be called just once for each option that takes an argument.
After ARGBEGIN, argv0 is a copy of argv[0] (conventionally the name of the program).
After ARGEND, argv points at a zero-terminated list of the remaining argc arguments.
Alef
The Alef argument processing routines are unrelated. Instead, an aggr called Arg is initialized by a call to arginit. Successive calls to
argopt return successive option characters, or zero at the end of the options. After a call to argopt, argf will return any argument
string associated with the option.
EXAMPLES
This C program can take option b and option f, which requires an argument.
#include <u.h>
#include <libc.h>
void
main(int argc, char *argv[])
{
char *f;
print("%s", argv[0]);
ARGBEGIN {
case 'b':
print(" -b");
break;
case 'f':
print(" -f(%s)", (f=ARGF())? f: "no arg");
break;
default:
print(" badflag('%c')", ARGC());
} ARGEND
print(" %d args:", argc);
while(*argv)
print(" '%s'", *argv++);
print("
");
exits(0);
}
Here is the output for the run prog -bffile1 -r -f file2 arg1 arg2
prog -b -f(file1) badflag('r') -f(file2) 2 args: 'arg1' 'arg2'
This Alef program accepts options b and, with an attached file name, f.
#include <alef.h>
void
main(int argc, byte **argv)
{
int a, ac, bflag;
byte *file;
Arg *arg;
arg = arginit(argc, argv);
while(ac = argopt(arg)) switch(ac){
case 'b':
bflag = 1;
break;
case 'f':
file = argf(arg);
break;
}
for(a=0; a<arg->ac; a++)
print("argument %s
", arg->av[a]);
}
SOURCE
/sys/include/libc.h
ARG(2)