tmux/arguments.c

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2014-11-08 12:27:43 +00:00
/* $OpenBSD$ */
/*
* Copyright (c) 2010 Nicholas Marriott <nicholas.marriott@gmail.com>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
* IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/types.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "tmux.h"
/*
* Manipulate command arguments.
*/
struct args_value {
char *value;
TAILQ_ENTRY(args_value) entry;
};
TAILQ_HEAD(args_values, args_value);
struct args_entry {
u_char flag;
struct args_values values;
u_int count;
RB_ENTRY(args_entry) entry;
};
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static struct args_entry *args_find(struct args *, u_char);
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static int args_cmp(struct args_entry *, struct args_entry *);
RB_GENERATE_STATIC(args_tree, args_entry, entry, args_cmp);
/* Arguments tree comparison function. */
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static int
args_cmp(struct args_entry *a1, struct args_entry *a2)
{
return (a1->flag - a2->flag);
}
/* Find a flag in the arguments tree. */
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static struct args_entry *
args_find(struct args *args, u_char flag)
{
struct args_entry entry;
entry.flag = flag;
return (RB_FIND(args_tree, &args->tree, &entry));
}
/* Parse an argv and argc into a new argument set. */
struct args *
args_parse(const char *template, int argc, char **argv)
{
struct args *args;
int opt;
args = xcalloc(1, sizeof *args);
optreset = 1;
optind = 1;
optarg = NULL;
while ((opt = getopt(argc, argv, template)) != -1) {
if (opt < 0)
continue;
if (opt == '?' || strchr(template, opt) == NULL) {
args_free(args);
return (NULL);
}
args_set(args, opt, optarg);
optarg = NULL;
}
argc -= optind;
argv += optind;
args->argc = argc;
args->argv = cmd_copy_argv(argc, argv);
return (args);
}
/* Free an arguments set. */
void
args_free(struct args *args)
{
struct args_entry *entry;
struct args_entry *entry1;
struct args_value *value;
struct args_value *value1;
cmd_free_argv(args->argc, args->argv);
RB_FOREACH_SAFE(entry, args_tree, &args->tree, entry1) {
RB_REMOVE(args_tree, &args->tree, entry);
TAILQ_FOREACH_SAFE(value, &entry->values, entry, value1) {
TAILQ_REMOVE(&entry->values, value, entry);
free(value->value);
free(value);
}
free(entry);
}
free(args);
}
/* Add to string. */
static void printflike(3, 4)
args_print_add(char **buf, size_t *len, const char *fmt, ...)
{
va_list ap;
char *s;
size_t slen;
va_start(ap, fmt);
slen = xvasprintf(&s, fmt, ap);
va_end(ap);
*len += slen;
*buf = xrealloc(*buf, *len);
strlcat(*buf, s, *len);
free(s);
}
/* Add value to string. */
static void
args_print_add_value(char **buf, size_t *len, struct args_entry *entry,
struct args_value *value)
{
char *escaped;
if (**buf != '\0')
args_print_add(buf, len, " -%c ", entry->flag);
else
args_print_add(buf, len, "-%c ", entry->flag);
escaped = args_escape(value->value);
args_print_add(buf, len, "%s", escaped);
free(escaped);
}
/* Add argument to string. */
static void
args_print_add_argument(char **buf, size_t *len, const char *argument)
{
char *escaped;
if (**buf != '\0')
args_print_add(buf, len, " ");
escaped = args_escape(argument);
args_print_add(buf, len, "%s", escaped);
free(escaped);
}
/* Print a set of arguments. */
char *
args_print(struct args *args)
{
size_t len;
char *buf;
int i;
u_int j;
struct args_entry *entry;
struct args_value *value;
len = 1;
buf = xcalloc(1, len);
/* Process the flags first. */
RB_FOREACH(entry, args_tree, &args->tree) {
if (!TAILQ_EMPTY(&entry->values))
continue;
if (*buf == '\0')
args_print_add(&buf, &len, "-");
for (j = 0; j < entry->count; j++)
args_print_add(&buf, &len, "%c", entry->flag);
}
/* Then the flags with arguments. */
RB_FOREACH(entry, args_tree, &args->tree) {
TAILQ_FOREACH(value, &entry->values, entry)
args_print_add_value(&buf, &len, entry, value);
}
/* And finally the argument vector. */
for (i = 0; i < args->argc; i++)
args_print_add_argument(&buf, &len, args->argv[i]);
return (buf);
}
/* Escape an argument. */
char *
args_escape(const char *s)
{
static const char dquoted[] = " #';${}";
static const char squoted[] = " \"";
char *escaped, *result;
int flags, quotes = 0;
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if (*s == '\0') {
xasprintf(&result, "''");
return (result);
}
if (s[strcspn(s, dquoted)] != '\0')
quotes = '"';
else if (s[strcspn(s, squoted)] != '\0')
quotes = '\'';
if (s[0] != ' ' &&
s[1] == '\0' &&
(quotes != 0 || s[0] == '~')) {
xasprintf(&escaped, "\\%c", s[0]);
return (escaped);
}
flags = VIS_OCTAL|VIS_CSTYLE|VIS_TAB|VIS_NL;
if (quotes == '"')
flags |= VIS_DQ;
utf8_stravis(&escaped, s, flags);
if (quotes == '\'')
xasprintf(&result, "'%s'", escaped);
else if (quotes == '"') {
if (*escaped == '~')
xasprintf(&result, "\"\\%s\"", escaped);
else
xasprintf(&result, "\"%s\"", escaped);
} else {
if (*escaped == '~')
xasprintf(&result, "\\%s", escaped);
else
result = xstrdup(escaped);
}
free(escaped);
return (result);
}
/* Return if an argument is present. */
int
args_has(struct args *args, u_char flag)
{
struct args_entry *entry;
entry = args_find(args, flag);
if (entry == NULL)
return (0);
return (entry->count);
}
/* Set argument value in the arguments tree. */
void
args_set(struct args *args, u_char flag, const char *s)
{
struct args_entry *entry;
struct args_value *value;
entry = args_find(args, flag);
if (entry == NULL) {
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entry = xcalloc(1, sizeof *entry);
entry->flag = flag;
entry->count = 1;
TAILQ_INIT(&entry->values);
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RB_INSERT(args_tree, &args->tree, entry);
} else
entry->count++;
if (s != NULL) {
value = xcalloc(1, sizeof *value);
value->value = xstrdup(s);
TAILQ_INSERT_TAIL(&entry->values, value, entry);
}
}
/* Get argument value. Will be NULL if it isn't present. */
const char *
args_get(struct args *args, u_char flag)
{
struct args_entry *entry;
if ((entry = args_find(args, flag)) == NULL)
return (NULL);
if (TAILQ_EMPTY(&entry->values))
return (NULL);
return (TAILQ_LAST(&entry->values, args_values)->value);
}
/* Get first argument. */
u_char
args_first(struct args *args, struct args_entry **entry)
{
*entry = RB_MIN(args_tree, &args->tree);
if (*entry == NULL)
return (0);
return ((*entry)->flag);
}
/* Get next argument. */
u_char
args_next(struct args_entry **entry)
{
*entry = RB_NEXT(args_tree, &args->tree, *entry);
if (*entry == NULL)
return (0);
return ((*entry)->flag);
}
/* Get first value in argument. */
const char *
args_first_value(struct args *args, u_char flag, struct args_value **value)
{
struct args_entry *entry;
if ((entry = args_find(args, flag)) == NULL)
return (NULL);
*value = TAILQ_FIRST(&entry->values);
if (*value == NULL)
return (NULL);
return ((*value)->value);
}
/* Get next value in argument. */
const char *
args_next_value(struct args_value **value)
{
if (*value == NULL)
return (NULL);
*value = TAILQ_NEXT(*value, entry);
if (*value == NULL)
return (NULL);
return ((*value)->value);
}
/* Convert an argument value to a number. */
long long
args_strtonum(struct args *args, u_char flag, long long minval,
long long maxval, char **cause)
{
const char *errstr;
long long ll;
struct args_entry *entry;
struct args_value *value;
if ((entry = args_find(args, flag)) == NULL) {
*cause = xstrdup("missing");
return (0);
}
value = TAILQ_LAST(&entry->values, args_values);
ll = strtonum(value->value, minval, maxval, &errstr);
if (errstr != NULL) {
*cause = xstrdup(errstr);
return (0);
}
*cause = NULL;
return (ll);
}
/* Convert an argument to a number which may be a percentage. */
long long
args_percentage(struct args *args, u_char flag, long long minval,
long long maxval, long long curval, char **cause)
{
const char *value;
struct args_entry *entry;
if ((entry = args_find(args, flag)) == NULL) {
*cause = xstrdup("missing");
return (0);
}
value = TAILQ_LAST(&entry->values, args_values)->value;
return (args_string_percentage(value, minval, maxval, curval, cause));
}
/* Convert a string to a number which may be a percentage. */
long long
args_string_percentage(const char *value, long long minval, long long maxval,
long long curval, char **cause)
{
const char *errstr;
long long ll;
size_t valuelen = strlen(value);
char *copy;
if (value[valuelen - 1] == '%') {
copy = xstrdup(value);
copy[valuelen - 1] = '\0';
ll = strtonum(copy, 0, 100, &errstr);
free(copy);
if (errstr != NULL) {
*cause = xstrdup(errstr);
return (0);
}
ll = (curval * ll) / 100;
if (ll < minval) {
*cause = xstrdup("too small");
return (0);
}
if (ll > maxval) {
*cause = xstrdup("too large");
return (0);
}
} else {
ll = strtonum(value, minval, maxval, &errstr);
if (errstr != NULL) {
*cause = xstrdup(errstr);
return (0);
}
}
*cause = NULL;
return (ll);
}