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opt.c
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opt.c
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#include <ccan/opt/opt.h>
#include <string.h>
#include <errno.h>
#include <stdlib.h>
#include <stdio.h>
#ifndef WIN32
#include <err.h>
#else
#include <libgen.h>
#define errx(status, fmt, ...) { \
fprintf(stderr, fmt, __VA_ARGS__); \
fprintf(stderr, "\n"); \
exit(status); }
#endif
#include <assert.h>
#include <stdarg.h>
#include <stdint.h>
#include "private.h"
struct opt_table *opt_table;
unsigned int opt_count, opt_num_short, opt_num_short_arg, opt_num_long;
const char *opt_argv0;
/* Returns string after first '-'. */
static const char *first_name(const char *names, unsigned *len)
{
*len = strcspn(names + 1, "|= ");
return names + 1;
}
static const char *next_name(const char *names, unsigned *len)
{
names += *len;
if (names[0] == ' ' || names[0] == '=' || names[0] == '\0')
return NULL;
return first_name(names + 1, len);
}
static const char *first_opt(unsigned *i, unsigned *len)
{
for (*i = 0; *i < opt_count; (*i)++) {
if (opt_table[*i].type == OPT_SUBTABLE)
continue;
return first_name(opt_table[*i].names, len);
}
return NULL;
}
static const char *next_opt(const char *p, unsigned *i, unsigned *len)
{
for (; *i < opt_count; (*i)++) {
if (opt_table[*i].type == OPT_SUBTABLE)
continue;
if (!p)
return first_name(opt_table[*i].names, len);
p = next_name(p, len);
if (p)
return p;
}
return NULL;
}
const char *first_lopt(unsigned *i, unsigned *len)
{
const char *p;
for (p = first_opt(i, len); p; p = next_opt(p, i, len)) {
if (p[0] == '-') {
/* Skip leading "-" */
(*len)--;
p++;
break;
}
}
return p;
}
const char *next_lopt(const char *p, unsigned *i, unsigned *len)
{
for (p = next_opt(p, i, len); p; p = next_opt(p, i, len)) {
if (p[0] == '-') {
/* Skip leading "-" */
(*len)--;
p++;
break;
}
}
return p;
}
const char *first_sopt(unsigned *i)
{
const char *p;
unsigned int len = 0 /* GCC bogus warning */;
for (p = first_opt(i, &len); p; p = next_opt(p, i, &len)) {
if (p[0] != '-')
break;
}
return p;
}
const char *next_sopt(const char *p, unsigned *i)
{
unsigned int len = 1;
for (p = next_opt(p, i, &len); p; p = next_opt(p, i, &len)) {
if (p[0] != '-')
break;
}
return p;
}
static void check_opt(const struct opt_table *entry)
{
const char *p;
unsigned len;
if (entry->type != OPT_HASARG && entry->type != OPT_NOARG && entry->type != OPT_PROCESSARG)
errx(1, "Option %s: unknown entry type %u",
entry->names, entry->type);
if (!entry->desc)
errx(1, "Option %s: description cannot be NULL", entry->names);
if (entry->names[0] != '-')
errx(1, "Option %s: does not begin with '-'", entry->names);
for (p = first_name(entry->names, &len); p; p = next_name(p, &len)) {
if (*p == '-') {
if (len == 1)
errx(1, "Option %s: invalid long option '--'",
entry->names);
opt_num_long++;
} else {
if (len != 1)
errx(1, "Option %s: invalid short option"
" '%.*s'", entry->names, len+1, p-1);
opt_num_short++;
if (entry->type == OPT_HASARG)
opt_num_short_arg++;
}
/* Don't document args unless there are some. */
if (entry->type == OPT_NOARG) {
if (p[len] == ' ' || p[len] == '=')
errx(1, "Option %s: does not take arguments"
" '%s'", entry->names, p+len+1);
}
}
}
static void add_opt(const struct opt_table *entry)
{
opt_table = realloc(opt_table, sizeof(opt_table[0]) * (opt_count+1));
opt_table[opt_count++] = *entry;
}
void _opt_register(const char *names, enum opt_type type,
char *(*cb)(void *arg),
char *(*cb_arg)(const char *optarg, void *arg),
void (*show)(char buf[OPT_SHOW_LEN], const void *arg),
const void *arg, const char *desc)
{
struct opt_table opt;
opt.names = names;
opt.type = type;
opt.cb = cb;
opt.cb_arg = cb_arg;
opt.show = show;
opt.u.carg = arg;
opt.desc = desc;
check_opt(&opt);
add_opt(&opt);
}
void opt_register_table(const struct opt_table entry[], const char *desc)
{
unsigned int i, start = opt_count;
if (desc) {
struct opt_table heading = OPT_SUBTABLE(NULL, desc);
add_opt(&heading);
}
for (i = 0; entry[i].type != OPT_END; i++) {
if (entry[i].type == OPT_SUBTABLE)
opt_register_table(subtable_of(&entry[i]),
entry[i].desc);
else {
check_opt(&entry[i]);
add_opt(&entry[i]);
}
}
/* We store the table length in arg ptr. */
if (desc)
opt_table[start].u.tlen = (opt_count - start);
}
/* Parse your arguments. */
bool opt_parse(int *argc, char *argv[], void (*errlog)(const char *fmt, ...))
{
int ret;
unsigned offset = 0;
#ifdef WIN32
char *original_argv0 = argv[0];
argv[0] = (char*)basename(argv[0]);
#endif
/* This helps opt_usage. */
opt_argv0 = argv[0];
while ((ret = parse_one(argc, argv, &offset, errlog)) == 1);
#ifdef WIN32
argv[0] = original_argv0;
#endif
/* parse_one returns 0 on finish, -1 on error */
return (ret == 0);
}
void opt_free_table(void)
{
free(opt_table);
opt_table=0;
}
void opt_log_stderr(const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
vfprintf(stderr, fmt, ap);
fprintf(stderr, "\n");
va_end(ap);
}
void opt_log_stderr_exit(const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
vfprintf(stderr, fmt, ap);
fprintf(stderr, "\n");
va_end(ap);
exit(1);
}
char *opt_invalid_argument(const char *arg)
{
char *str = malloc(sizeof("Invalid argument '%s'") + strlen(arg));
sprintf(str, "Invalid argument '%s'", arg);
return str;
}