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/*
* Macros for processing command arguments.
*
* Conforms closely to the command option requirements of intro(1) in System V
* and intro(C) in Xenix.
*
* A command consists of: cmdname [ options ] [ cmdarguments ]
*
* Options consist of a leading dash '-' and a flag letter. An argument may
* follow optionally preceded by white space.
* Options without arguments may be grouped behind a single dash.
* A dash on its own is interpreted as the end of the options and is retained
* as a command argument.
* A double dash '--' is interpreted as the end of the options and is discarded.
*
* For example:
* zap -xz -f flame -q34 -- -x
*
* where zap.c contains the following in main():
*
* OPTIONS("[-xz] [-q queue-id] [-f dump-file] user")
* FLAG('x', xecute)
* FLAG('z', zot)
* STRING('f', file)
* fp = fopen(file, "w");
* NUMBER('q', queue)
* ENDOPTS
*
* Results in:
* xecute = 1
* zot = 1
* file = "flame"
* fp = fopen("flame", "w")
* queue = 34
* argc = 2
* argv[0] = "zap"
* argv[1] = "-x"
*
* Should the user enter unknown flags or leave out required arguments,
* the message:
*
* Usage: zap [-xz] [-q queue-id] [-f dump-file] user
*
* will be printed. This message can be printed by calling pusage(), or
* usage(). usage() will also cause program termination with exit code 1.
*
* Author: Stephen McKay, February 1991
*
* Based on recollection of the original options.h produced at the University
* of Queensland by Ross Patterson (and possibly others).
*/
static char *O_usage;
static char *O_name;
extern long atol();
void
pusage()
{
/*
* Avoid gratuitously loading stdio.
*/
write(2, "Usage: ", 7);
write(2, O_name, strlen(O_name));
write(2, " ", 1);
write(2, O_usage, strlen(O_usage));
write(2, "\n", 1);
}
#define usage() (pusage(), exit(1))
#define OPTIONS(usage_msg) \
{ \
char O_cont; \
O_usage = (usage_msg); \
O_name = argv[0]; \
while (*++argv && **argv == '-') \
{ \
if ((*argv)[1] == '\0') \
break; \
argc--; \
if ((*argv)[1] == '-' && (*argv)[2] == '\0') \
{ \
argv++; \
break; \
} \
O_cont = 1; \
while (O_cont) \
switch (*++*argv) \
{ \
default: \
case '-': \
usage(); \
case '\0': \
O_cont = 0;
#define FLAG(x,flag) \
break; \
case (x): \
(flag) = 1;
#define CHAR(x,ch) \
break; \
case (x): \
O_cont = 0; \
if (*++*argv == '\0' && (--argc, *++argv == 0)) \
usage(); \
(ch) = **argv;
#define NUMBER(x,n) \
break; \
case (x): \
O_cont = 0; \
if (*++*argv == '\0' && (--argc, *++argv == 0)) \
usage(); \
(n) = atol(*argv);
#define STRING(x,str) \
break; \
case (x): \
O_cont = 0; \
if (*++*argv == '\0' && (--argc, *++argv == 0)) \
usage(); \
(str) = *argv;
#define SUFFIX(x,str) \
break; \
case (x): \
(str) = ++*argv; \
O_cont = 0;
#define ENDOPTS \
break; \
} \
} \
*--argv = O_name; \
}
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