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args.c
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args.c
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#include "args.h"
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <ctype.h>
#include <setjmp.h>
#define WRAP 80
#define ARGMAXLEN 256
#define ERRMAXLEN 256
#define xenter(ctx) \
ctx->entered++; \
if(ctx->entered == 1) \
if(setjmp(ctx->entry)) \
return ARGS_ERROR; \
struct args_context {
int argc;
char **argv;
int entered;
jmp_buf entry;
int idx; /* current argument being parsed */
int off; /* offset when traversing a collection of short options
* (such as -abc) */
int no_more_options;
char arg[ARGMAXLEN];
char error[ERRMAXLEN];
};
static const char *nextword(const char *(*text));
static int xprintf(FILE *, const char *fmt, ...);
static int print_option(FILE *, const args_option *opt);
static int parselongopt(args_context *ctx, int argc, char **argv, char **optarg);
static int parseshortopt(args_context *ctx, int argc, char **argv, char **optarg);
static void xpanic(args_context *ctx, const char *fmt, ...);
const args_option *args_get_option_by_flag(const args_option *opts, const char *flag)
{
int i, j;
for(i = 0; opts[i].code != 0; i++) {
for(j = 0; j < ARGS_MAX_OPTION_FLAGS; j++) {
if(opts[i].flags[j] == NULL)
break;
if(strcmp(flag, opts[i].flags[j]) == 0)
return &(opts[i]);
}
}
return NULL;
}
args_context *args_create(int argc, char **argv)
{
args_context *ctx = calloc(1, sizeof(args_context));
if(ctx == NULL)
return NULL;
ctx->argc = argc;
ctx->argv = argv;
return ctx;
}
void xleave(args_context *ctx)
{
if(ctx->entered == 0)
xpanic(ctx, "Duplicate exit from args_context");
ctx->entered--;
}
void xpanic(args_context *ctx, const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
vsnprintf(ctx->error, ERRMAXLEN, fmt, ap);
va_end(ap);
ctx->entered = 0;
longjmp(ctx->entry, -1);
}
void args_destroy(args_context *ctx)
{
free(ctx);
}
int args_next(args_context *ctx, const char **argp)
{
char *arg;
int retval;
xenter(ctx);
if(ctx->idx == 0)
ctx->idx++;
if(ctx->idx >= ctx->argc) {
retval = ARGS_END;
goto ret;
}
arg = ctx->argv[ctx->idx];
/* Plain option */
if(ctx->no_more_options || strlen(arg) <= 1 || arg[0] != '-') {
ctx->idx++;
*argp = arg;
retval = ARGS_PLAIN;
goto ret;
}
/* "--" argument, signifying end of any further options */
if(strcmp(arg, "--") == 0) {
ctx->idx++;
ctx->no_more_options = 1;
return args_next(ctx, argp);
}
/* Parameter */
if(ctx->off != 0 && arg[ctx->off] == '=')
xpanic(ctx, "Unexpected parameter");
/* Long options */
if(strncmp(arg, "--", 2) == 0) {
/* With parameter */
if(strchr(arg, '=') != NULL) {
/* TODO: This is probably flawed */
ctx->off = (int)(strchr(arg, '=') - arg);
strncpy(ctx->arg, arg, ctx->off); /* potential overflow */
ctx->arg[ctx->off] = '\0';
*argp = ctx->arg;
retval = ARGS_OPTION;
goto ret;
}
/* Without parameter */
ctx->idx++;
*argp = arg;
retval = ARGS_OPTION;
goto ret;
}
/* Short options */
if(arg[0] == '-') {
int c;
if(ctx->off == 0)
ctx->off++;
c = arg[ctx->off];
ctx->off++;
if(ctx->off == strlen(arg)) {
ctx->idx++;
ctx->off = 0;
}
sprintf(ctx->arg, "-%c", c);
*argp = ctx->arg;
retval = ARGS_OPTION;
goto ret;
}
/* Unreachable */
xpanic(ctx, "Unreachable code reached in args_next");
return ARGS_ERROR;
ret:
xleave(ctx);
return retval;
}
int args_take_parameter(args_context *ctx, const char **argp)
{
const char *arg;
xenter(ctx);
if(ctx->idx == ctx->argc)
xpanic(ctx, "End of arguments when looking for option parameter");
arg = ctx->argv[ctx->idx];
if(ctx->off == 0) {
ctx->idx++;
*argp = arg;
xleave(ctx);
return ARGS_OK;
}
if(arg[ctx->off] == '=') {
arg += ctx->off + 1;
ctx->off = 0;
ctx->idx++;
*argp = arg;
xleave(ctx);
return ARGS_OK;
}
arg += ctx->off;
ctx->off = 0;
ctx->idx++;
*argp = arg;
xleave(ctx);
return ARGS_OK;
}
const char *args_error(args_context *ctx)
{
return ctx->error;
}
int args_parse(args_context *ctx, const args_option *opts, const char **optarg)
{
const char *arg;
int argtype;
int err;
char *optarg_new = NULL;
int retval;
xenter(ctx);
argtype = args_next(ctx, &arg);
switch(argtype) {
case ARGS_END:
case ARGS_ERROR:
retval = argtype;
goto ret;
case ARGS_PLAIN:
*optarg = arg;
retval = ARGS_PLAIN;
goto ret;
case ARGS_OPTION:
{
const args_option *opt = args_get_option_by_flag(opts, arg);
if(opt == NULL)
xpanic(ctx, "Unrecognized flag '%s'", arg);
if(opt->parameter != NULL) {
err = args_take_parameter(ctx, optarg);
if(err)
xpanic(ctx, "Missing parameter to '%s'", arg);
}
retval = opt->code;
goto ret;
}
}
xpanic(ctx, "Unreachable code reached in args_parse");
return ARGS_ERROR;
ret:
xleave(ctx);
return retval;
}
int xprintf(FILE *file, const char *fmt, ...)
{
va_list ap;
int val;
va_start(ap, fmt);
if(file == NULL)
val = vsnprintf(NULL, 0, fmt, ap);
else
val = vfprintf(file, fmt, ap);
va_end(ap);
return val;
}
int print_option(FILE *out, const args_option *opt)
{
/* Cases:
* -h |
* -i FILENAME |
* -h, --help |
* --version |
* --format=FORMAT |
* -o, --output=FILENAME |
*/
unsigned off = 0;
int last_was_long = 0;
int i;
off += xprintf(out, " ");
for(i = 0; opt->flags[i] != NULL; i++) {
if(i != 0)
off += xprintf(out, ", ");
off += xprintf(out, "%s", opt->flags[i]);
last_was_long = strlen(opt->flags[i]) > 2;
}
if(opt->parameter != NULL)
if(last_was_long)
off += xprintf(out, "=%s", opt->parameter);
else
off += xprintf(out, " %s", opt->parameter);
off += xprintf(out, " ");
return off;
}
void args_print_options(FILE *out, const args_option *opts)
{
unsigned maxoff = 0;
unsigned off = 0;
const args_option *opt;
int i;
/* First find a common offset long enough for every option.
*/
for(i = 0; opts[i].code != 0; i++) {
opt = &(opts[i]);
off = print_option(NULL, opt);
if(off > maxoff)
maxoff = off;
}
/* Write options with option help at given offset. */
for(i = 0; opts[i].code != 0; i++) {
opt = &(opts[i]);
off = print_option(out, opt);
args_print_wrap_and_indent(out, maxoff, off, opt->help);
}
}
const char *args_get_command(const char *argv0)
{
const char *sepcheck = NULL;
for(sepcheck = argv0; *sepcheck != '\0'; sepcheck++)
if(*sepcheck == '/')
argv0 = sepcheck + 1;
return argv0;
}
const char *nextword(const char *(*text))
{
static char word[WRAP + 1] = { 0 };
int i;
while(**text && !isgraph(**text))
(*text)++;
if(**text == '\0')
return NULL;
for(i = 0; i < WRAP && isgraph(**text); i++) {
word[i] = **text;
(*text)++;
}
word[i] = '\0';
return word;
}
void args_print_wrap_and_indent(FILE *out, int ind, int initind, const char *text)
{
int i;
int textoff = 0;
int curoff;
int maxoff = WRAP;
const char *word;
int wordlen;
int newline;
if(initind < ind) {
for(i = 0; i < ind - initind; i++)
fputc(' ', out);
curoff = ind;
} else
curoff = initind;
newline = 1;
while((word = nextword(&text)) != NULL) {
wordlen = (int)strlen(word);
if(curoff + wordlen > WRAP && !newline) {
fputc('\n', out);
for(i = 0; i < ind; i++)
fputc(' ', out);
curoff = ind;
newline = 1;
}
if(!newline) {
fputc(' ', out);
curoff++;
}
curoff += fprintf(out, "%s", word);
newline = 0;
}
fputc('\n', out);
}
int args_parse_definition(char *def, char **namep, char **valuep)
{
int i;
char c;
while((c = def[i++]) != '\0')
if(c == '=')
break;
if(c == '\0')
return -1;
def[i] = '\0';
*namep = def;
*valuep = def + i + 1;
return 0;
}