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format.c
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/* $OpenBSD$ */
/*
* Copyright (c) 2011 Nicholas Marriott <[email protected]>
*
* 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 <sys/wait.h>
#include <ctype.h>
#include <errno.h>
#include <fnmatch.h>
#include <libgen.h>
#include <stdarg.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include "tmux.h"
/*
* Build a list of key-value pairs and use them to expand #{key} entries in a
* string.
*/
struct format_entry;
typedef void (*format_cb)(struct format_tree *, struct format_entry *);
static char *format_job_get(struct format_tree *, const char *);
static void format_job_timer(int, short, void *);
static char *format_find(struct format_tree *, const char *, int);
static void format_add_cb(struct format_tree *, const char *, format_cb);
static void format_add_tv(struct format_tree *, const char *,
struct timeval *);
static int format_replace(struct format_tree *, const char *, size_t,
char **, size_t *, size_t *);
static void format_defaults_session(struct format_tree *,
struct session *);
static void format_defaults_client(struct format_tree *, struct client *);
static void format_defaults_winlink(struct format_tree *, struct winlink *);
/* Entry in format job tree. */
struct format_job {
struct client *client;
u_int tag;
const char *cmd;
const char *expanded;
time_t last;
char *out;
int updated;
struct job *job;
int status;
RB_ENTRY(format_job) entry;
};
/* Format job tree. */
static struct event format_job_event;
static int format_job_cmp(struct format_job *, struct format_job *);
static RB_HEAD(format_job_tree, format_job) format_jobs = RB_INITIALIZER();
RB_GENERATE_STATIC(format_job_tree, format_job, entry, format_job_cmp);
/* Format job tree comparison function. */
static int
format_job_cmp(struct format_job *fj1, struct format_job *fj2)
{
if (fj1->tag < fj2->tag)
return (-1);
if (fj1->tag > fj2->tag)
return (1);
return (strcmp(fj1->cmd, fj2->cmd));
}
/* Format modifiers. */
#define FORMAT_TIMESTRING 0x1
#define FORMAT_BASENAME 0x2
#define FORMAT_DIRNAME 0x4
#define FORMAT_SUBSTITUTE 0x8
#define FORMAT_QUOTE 0x10
/* Entry in format tree. */
struct format_entry {
char *key;
char *value;
time_t t;
format_cb cb;
RB_ENTRY(format_entry) entry;
};
/* Format entry tree. */
struct format_tree {
struct client *c;
struct session *s;
struct winlink *wl;
struct window *w;
struct window_pane *wp;
struct client *client;
u_int tag;
int flags;
RB_HEAD(format_entry_tree, format_entry) tree;
};
static int format_entry_cmp(struct format_entry *, struct format_entry *);
RB_GENERATE_STATIC(format_entry_tree, format_entry, entry, format_entry_cmp);
/* Format entry tree comparison function. */
static int
format_entry_cmp(struct format_entry *fe1, struct format_entry *fe2)
{
return (strcmp(fe1->key, fe2->key));
}
/* Single-character uppercase aliases. */
static const char *format_upper[] = {
NULL, /* A */
NULL, /* B */
NULL, /* C */
"pane_id", /* D */
NULL, /* E */
"window_flags", /* F */
NULL, /* G */
"host", /* H */
"window_index", /* I */
NULL, /* J */
NULL, /* K */
NULL, /* L */
NULL, /* M */
NULL, /* N */
NULL, /* O */
"pane_index", /* P */
NULL, /* Q */
NULL, /* R */
"session_name", /* S */
"pane_title", /* T */
NULL, /* U */
NULL, /* V */
"window_name", /* W */
NULL, /* X */
NULL, /* Y */
NULL /* Z */
};
/* Single-character lowercase aliases. */
static const char *format_lower[] = {
NULL, /* a */
NULL, /* b */
NULL, /* c */
NULL, /* d */
NULL, /* e */
NULL, /* f */
NULL, /* g */
"host_short", /* h */
NULL, /* i */
NULL, /* j */
NULL, /* k */
NULL, /* l */
NULL, /* m */
NULL, /* n */
NULL, /* o */
NULL, /* p */
NULL, /* q */
NULL, /* r */
NULL, /* s */
NULL, /* t */
NULL, /* u */
NULL, /* v */
NULL, /* w */
NULL, /* x */
NULL, /* y */
NULL /* z */
};
/* Format job update callback. */
static void
format_job_update(struct job *job)
{
struct format_job *fj = job_get_data(job);
struct evbuffer *evb = job_get_event(job)->input;
char *line = NULL, *next;
time_t t;
while ((next = evbuffer_readline(evb)) != NULL) {
free(line);
line = next;
}
if (line == NULL)
return;
fj->updated = 1;
free(fj->out);
fj->out = line;
log_debug("%s: %p %s: %s", __func__, fj, fj->cmd, fj->out);
t = time(NULL);
if (fj->status && fj->last != t) {
if (fj->client != NULL)
server_status_client(fj->client);
fj->last = t;
}
}
/* Format job complete callback. */
static void
format_job_complete(struct job *job)
{
struct format_job *fj = job_get_data(job);
struct evbuffer *evb = job_get_event(job)->input;
char *line, *buf;
size_t len;
fj->job = NULL;
buf = NULL;
if ((line = evbuffer_readline(evb)) == NULL) {
len = EVBUFFER_LENGTH(evb);
buf = xmalloc(len + 1);
if (len != 0)
memcpy(buf, EVBUFFER_DATA(evb), len);
buf[len] = '\0';
} else
buf = line;
log_debug("%s: %p %s: %s", __func__, fj, fj->cmd, buf);
if (*buf != '\0' || !fj->updated) {
free(fj->out);
fj->out = buf;
} else
free(buf);
if (fj->status) {
if (fj->client != NULL)
server_status_client(fj->client);
fj->status = 0;
}
}
/* Find a job. */
static char *
format_job_get(struct format_tree *ft, const char *cmd)
{
struct format_job_tree *jobs;
struct format_job fj0, *fj;
time_t t;
char *expanded;
int force;
if (ft->client == NULL)
jobs = &format_jobs;
else if (ft->client->jobs != NULL)
jobs = ft->client->jobs;
else {
jobs = ft->client->jobs = xmalloc(sizeof *ft->client->jobs);
RB_INIT(jobs);
}
fj0.tag = ft->tag;
fj0.cmd = cmd;
if ((fj = RB_FIND(format_job_tree, jobs, &fj0)) == NULL) {
fj = xcalloc(1, sizeof *fj);
fj->client = ft->client;
fj->tag = ft->tag;
fj->cmd = xstrdup(cmd);
fj->expanded = NULL;
xasprintf(&fj->out, "<'%s' not ready>", fj->cmd);
RB_INSERT(format_job_tree, jobs, fj);
}
expanded = format_expand(ft, cmd);
if (fj->expanded == NULL || strcmp(expanded, fj->expanded) != 0) {
free((void *)fj->expanded);
fj->expanded = xstrdup(expanded);
force = 1;
} else
force = (ft->flags & FORMAT_FORCE);
t = time(NULL);
if (fj->job == NULL && (force || fj->last != t)) {
fj->job = job_run(expanded, NULL,
server_client_get_cwd(ft->client, NULL), format_job_update,
format_job_complete, NULL, fj, JOB_NOWAIT);
if (fj->job == NULL) {
free(fj->out);
xasprintf(&fj->out, "<'%s' didn't start>", fj->cmd);
}
fj->last = t;
fj->updated = 0;
}
if (ft->flags & FORMAT_STATUS)
fj->status = 1;
free(expanded);
return (format_expand(ft, fj->out));
}
/* Remove old jobs. */
static void
format_job_tidy(struct format_job_tree *jobs, int force)
{
struct format_job *fj, *fj1;
time_t now;
now = time(NULL);
RB_FOREACH_SAFE(fj, format_job_tree, jobs, fj1) {
if (!force && (fj->last > now || now - fj->last < 3600))
continue;
RB_REMOVE(format_job_tree, jobs, fj);
log_debug("%s: %s", __func__, fj->cmd);
if (fj->job != NULL)
job_free(fj->job);
free((void *)fj->expanded);
free((void *)fj->cmd);
free(fj->out);
free(fj);
}
}
/* Remove old jobs for client. */
void
format_lost_client(struct client *c)
{
if (c->jobs != NULL)
format_job_tidy(c->jobs, 1);
free(c->jobs);
}
/* Remove old jobs periodically. */
static void
format_job_timer(__unused int fd, __unused short events, __unused void *arg)
{
struct client *c;
struct timeval tv = { .tv_sec = 60 };
format_job_tidy(&format_jobs, 0);
TAILQ_FOREACH(c, &clients, entry) {
if (c->jobs != NULL)
format_job_tidy(c->jobs, 0);
}
evtimer_del(&format_job_event);
evtimer_add(&format_job_event, &tv);
}
/* Callback for host. */
static void
format_cb_host(__unused struct format_tree *ft, struct format_entry *fe)
{
char host[HOST_NAME_MAX + 1];
if (gethostname(host, sizeof host) != 0)
fe->value = xstrdup("");
else
fe->value = xstrdup(host);
}
/* Callback for host_short. */
static void
format_cb_host_short(__unused struct format_tree *ft, struct format_entry *fe)
{
char host[HOST_NAME_MAX + 1], *cp;
if (gethostname(host, sizeof host) != 0)
fe->value = xstrdup("");
else {
if ((cp = strchr(host, '.')) != NULL)
*cp = '\0';
fe->value = xstrdup(host);
}
}
/* Callback for pid. */
static void
format_cb_pid(__unused struct format_tree *ft, struct format_entry *fe)
{
xasprintf(&fe->value, "%ld", (long)getpid());
}
/* Callback for session_alerts. */
static void
format_cb_session_alerts(struct format_tree *ft, struct format_entry *fe)
{
struct session *s = ft->s;
struct winlink *wl;
char alerts[1024], tmp[16];
if (s == NULL)
return;
*alerts = '\0';
RB_FOREACH(wl, winlinks, &s->windows) {
if ((wl->flags & WINLINK_ALERTFLAGS) == 0)
continue;
xsnprintf(tmp, sizeof tmp, "%u", wl->idx);
if (*alerts != '\0')
strlcat(alerts, ",", sizeof alerts);
strlcat(alerts, tmp, sizeof alerts);
if (wl->flags & WINLINK_ACTIVITY)
strlcat(alerts, "#", sizeof alerts);
if (wl->flags & WINLINK_BELL)
strlcat(alerts, "!", sizeof alerts);
if (wl->flags & WINLINK_SILENCE)
strlcat(alerts, "~", sizeof alerts);
}
fe->value = xstrdup(alerts);
}
/* Callback for session_stack. */
static void
format_cb_session_stack(struct format_tree *ft, struct format_entry *fe)
{
struct session *s = ft->s;
struct winlink *wl;
char result[1024], tmp[16];
if (s == NULL)
return;
xsnprintf(result, sizeof result, "%u", s->curw->idx);
TAILQ_FOREACH(wl, &s->lastw, sentry) {
xsnprintf(tmp, sizeof tmp, "%u", wl->idx);
if (*result != '\0')
strlcat(result, ",", sizeof result);
strlcat(result, tmp, sizeof result);
}
fe->value = xstrdup(result);
}
/* Callback for window_stack_index. */
static void
format_cb_window_stack_index(struct format_tree *ft, struct format_entry *fe)
{
struct session *s = ft->wl->session;
struct winlink *wl;
u_int idx;
idx = 0;
TAILQ_FOREACH(wl, &s->lastw, sentry) {
idx++;
if (wl == ft->wl)
break;
}
if (wl != NULL)
xasprintf(&fe->value, "%u", idx);
else
fe->value = xstrdup("0");
}
/* Callback for window_layout. */
static void
format_cb_window_layout(struct format_tree *ft, struct format_entry *fe)
{
struct window *w = ft->w;
if (w == NULL)
return;
if (w->saved_layout_root != NULL)
fe->value = layout_dump(w->saved_layout_root);
else
fe->value = layout_dump(w->layout_root);
}
/* Callback for window_visible_layout. */
static void
format_cb_window_visible_layout(struct format_tree *ft, struct format_entry *fe)
{
struct window *w = ft->w;
if (w == NULL)
return;
fe->value = layout_dump(w->layout_root);
}
/* Callback for pane_start_command. */
static void
format_cb_start_command(struct format_tree *ft, struct format_entry *fe)
{
struct window_pane *wp = ft->wp;
if (wp == NULL)
return;
fe->value = cmd_stringify_argv(wp->argc, wp->argv);
}
/* Callback for pane_current_command. */
static void
format_cb_current_command(struct format_tree *ft, struct format_entry *fe)
{
struct window_pane *wp = ft->wp;
char *cmd;
if (wp == NULL)
return;
cmd = osdep_get_name(wp->fd, wp->tty);
if (cmd == NULL || *cmd == '\0') {
free(cmd);
cmd = cmd_stringify_argv(wp->argc, wp->argv);
if (cmd == NULL || *cmd == '\0') {
free(cmd);
cmd = xstrdup(wp->shell);
}
}
fe->value = parse_window_name(cmd);
free(cmd);
}
/* Callback for pane_current_path. */
static void
format_cb_current_path(struct format_tree *ft, struct format_entry *fe)
{
struct window_pane *wp = ft->wp;
char *cwd;
if (wp == NULL)
return;
cwd = osdep_get_cwd(wp->fd);
if (cwd != NULL)
fe->value = xstrdup(cwd);
}
/* Callback for history_bytes. */
static void
format_cb_history_bytes(struct format_tree *ft, struct format_entry *fe)
{
struct window_pane *wp = ft->wp;
struct grid *gd;
struct grid_line *gl;
unsigned long long size;
u_int i;
if (wp == NULL)
return;
gd = wp->base.grid;
size = 0;
for (i = 0; i < gd->hsize; i++) {
gl = grid_get_line(gd, i);
size += gl->cellsize * sizeof *gl->celldata;
size += gl->extdsize * sizeof *gl->extddata;
}
size += gd->hsize * sizeof *gl;
xasprintf(&fe->value, "%llu", size);
}
/* Callback for pane_tabs. */
static void
format_cb_pane_tabs(struct format_tree *ft, struct format_entry *fe)
{
struct window_pane *wp = ft->wp;
struct evbuffer *buffer;
u_int i;
int size;
if (wp == NULL)
return;
buffer = evbuffer_new();
if (buffer == NULL)
fatalx("out of memory");
for (i = 0; i < wp->base.grid->sx; i++) {
if (!bit_test(wp->base.tabs, i))
continue;
if (EVBUFFER_LENGTH(buffer) > 0)
evbuffer_add(buffer, ",", 1);
evbuffer_add_printf(buffer, "%u", i);
}
if ((size = EVBUFFER_LENGTH(buffer)) != 0)
xasprintf(&fe->value, "%.*s", size, EVBUFFER_DATA(buffer));
evbuffer_free(buffer);
}
/* Callback for session_group_list. */
static void
format_cb_session_group_list(struct format_tree *ft, struct format_entry *fe)
{
struct session *s = ft->s;
struct session_group *sg;
struct session *loop;
struct evbuffer *buffer;
int size;
if (s == NULL)
return;
sg = session_group_contains(s);
if (sg == NULL)
return;
buffer = evbuffer_new();
if (buffer == NULL)
fatalx("out of memory");
TAILQ_FOREACH(loop, &sg->sessions, gentry) {
if (EVBUFFER_LENGTH(buffer) > 0)
evbuffer_add(buffer, ",", 1);
evbuffer_add_printf(buffer, "%s", loop->name);
}
if ((size = EVBUFFER_LENGTH(buffer)) != 0)
xasprintf(&fe->value, "%.*s", size, EVBUFFER_DATA(buffer));
evbuffer_free(buffer);
}
/* Merge a format tree. */
static void
format_merge(struct format_tree *ft, struct format_tree *from)
{
struct format_entry *fe;
RB_FOREACH(fe, format_entry_tree, &from->tree) {
if (fe->value != NULL)
format_add(ft, fe->key, "%s", fe->value);
}
}
/* Create a new tree. */
struct format_tree *
format_create(struct client *c, struct cmdq_item *item, int tag, int flags)
{
struct format_tree *ft;
if (!event_initialized(&format_job_event)) {
evtimer_set(&format_job_event, format_job_timer, NULL);
format_job_timer(-1, 0, NULL);
}
ft = xcalloc(1, sizeof *ft);
RB_INIT(&ft->tree);
if (c != NULL) {
ft->client = c;
ft->client->references++;
}
ft->tag = tag;
ft->flags = flags;
format_add(ft, "version", "%s", VERSION);
format_add_cb(ft, "host", format_cb_host);
format_add_cb(ft, "host_short", format_cb_host_short);
format_add_cb(ft, "pid", format_cb_pid);
format_add(ft, "socket_path", "%s", socket_path);
format_add_tv(ft, "start_time", &start_time);
if (item != NULL) {
if (item->cmd != NULL)
format_add(ft, "command", "%s", item->cmd->entry->name);
if (item->shared != NULL && item->shared->formats != NULL)
format_merge(ft, item->shared->formats);
}
return (ft);
}
/* Free a tree. */
void
format_free(struct format_tree *ft)
{
struct format_entry *fe, *fe1;
RB_FOREACH_SAFE(fe, format_entry_tree, &ft->tree, fe1) {
RB_REMOVE(format_entry_tree, &ft->tree, fe);
free(fe->value);
free(fe->key);
free(fe);
}
if (ft->client != NULL)
server_client_unref(ft->client);
free(ft);
}
/* Add a key-value pair. */
void
format_add(struct format_tree *ft, const char *key, const char *fmt, ...)
{
struct format_entry *fe;
struct format_entry *fe_now;
va_list ap;
fe = xmalloc(sizeof *fe);
fe->key = xstrdup(key);
fe_now = RB_INSERT(format_entry_tree, &ft->tree, fe);
if (fe_now != NULL) {
free(fe->key);
free(fe);
free(fe_now->value);
fe = fe_now;
}
fe->cb = NULL;
fe->t = 0;
va_start(ap, fmt);
xvasprintf(&fe->value, fmt, ap);
va_end(ap);
}
/* Add a key and time. */
static void
format_add_tv(struct format_tree *ft, const char *key, struct timeval *tv)
{
struct format_entry *fe;
struct format_entry *fe_now;
fe = xmalloc(sizeof *fe);
fe->key = xstrdup(key);
fe_now = RB_INSERT(format_entry_tree, &ft->tree, fe);
if (fe_now != NULL) {
free(fe->key);
free(fe);
free(fe_now->value);
fe = fe_now;
}
fe->cb = NULL;
fe->t = tv->tv_sec;
fe->value = NULL;
}
/* Add a key and function. */
static void
format_add_cb(struct format_tree *ft, const char *key, format_cb cb)
{
struct format_entry *fe;
struct format_entry *fe_now;
fe = xmalloc(sizeof *fe);
fe->key = xstrdup(key);
fe_now = RB_INSERT(format_entry_tree, &ft->tree, fe);
if (fe_now != NULL) {
free(fe->key);
free(fe);
free(fe_now->value);
fe = fe_now;
}
fe->cb = cb;
fe->t = 0;
fe->value = NULL;
}
/* Quote special characters in string. */
static char *
format_quote(const char *s)
{
const char *cp;
char *out, *at;
at = out = xmalloc(strlen(s) * 2 + 1);
for (cp = s; *cp != '\0'; cp++) {
if (strchr("|&;<>()$`\\\"'*?[# =%", *cp) != NULL)
*at++ = '\\';
*at++ = *cp;
}
*at = '\0';
return (out);
}
/* Find a format entry. */
static char *
format_find(struct format_tree *ft, const char *key, int modifiers)
{
struct format_entry *fe, fe_find;
struct environ_entry *envent;
static char s[64];
struct options_entry *o;
const char *found;
int idx;
char *copy, *saved;
if (~modifiers & FORMAT_TIMESTRING) {
o = options_parse_get(global_options, key, &idx, 0);
if (o == NULL && ft->w != NULL)
o = options_parse_get(ft->w->options, key, &idx, 0);
if (o == NULL)
o = options_parse_get(global_w_options, key, &idx, 0);
if (o == NULL && ft->s != NULL)
o = options_parse_get(ft->s->options, key, &idx, 0);
if (o == NULL)
o = options_parse_get(global_s_options, key, &idx, 0);
if (o != NULL) {
found = options_tostring(o, idx, 1);
goto found;
}
}
found = NULL;
fe_find.key = (char *) key;
fe = RB_FIND(format_entry_tree, &ft->tree, &fe_find);
if (fe != NULL) {
if (modifiers & FORMAT_TIMESTRING) {
if (fe->t == 0)
return (NULL);
ctime_r(&fe->t, s);
s[strcspn(s, "\n")] = '\0';
found = s;
goto found;
}
if (fe->t != 0) {
xsnprintf(s, sizeof s, "%lld", (long long)fe->t);
found = s;
goto found;
}
if (fe->value == NULL && fe->cb != NULL) {
fe->cb(ft, fe);
if (fe->value == NULL)
fe->value = xstrdup("");
}
found = fe->value;
goto found;
}
if (~modifiers & FORMAT_TIMESTRING) {
envent = NULL;
if (ft->s != NULL)
envent = environ_find(ft->s->environ, key);
if (envent == NULL)
envent = environ_find(global_environ, key);
if (envent != NULL) {
found = envent->value;
goto found;
}
}
return (NULL);
found:
if (found == NULL)
return (NULL);
copy = xstrdup(found);
if (modifiers & FORMAT_BASENAME) {
saved = copy;
copy = xstrdup(basename(saved));
free(saved);
}
if (modifiers & FORMAT_DIRNAME) {
saved = copy;
copy = xstrdup(dirname(saved));
free(saved);
}
if (modifiers & FORMAT_QUOTE) {
saved = copy;
copy = xstrdup(format_quote(saved));
free(saved);
}
return (copy);
}
/* Skip until end. */
static const char *
format_skip(const char *s, char end)
{
int brackets = 0;
for (; *s != '\0'; s++) {
if (*s == '#' && s[1] == '{')
brackets++;
if (*s == '#' && strchr(",#{}", s[1]) != NULL) {
s++;
continue;
}
if (*s == '}')
brackets--;
if (*s == end && brackets == 0)
break;
}
if (*s == '\0')
return (NULL);
return (s);
}
/* Return left and right alternatives separated by commas. */
static int
format_choose(char *s, char **left, char **right)
{
char *cp;
cp = (char *)format_skip(s, ',');
if (cp == NULL)
return (-1);
*cp = '\0';
*left = s;
*right = cp + 1;
return (0);
}
/* Is this true? */
int
format_true(const char *s)
{
if (s != NULL && *s != '\0' && (s[0] != '0' || s[1] != '\0'))
return (1);
return (0);
}
/* Replace a key. */
static int
format_replace(struct format_tree *ft, const char *key, size_t keylen,
char **buf, size_t *len, size_t *off)
{
struct window_pane *wp = ft->wp;
char *copy, *copy0, *endptr, *ptr, *found, *new, sep;
char *value, *from = NULL, *to = NULL, *left, *right;
size_t valuelen, newlen, fromlen, tolen, used;
long limit = 0;
int modifiers = 0, compare = 0, search = 0;
int literal = 0;
/* Make a copy of the key. */
copy0 = copy = xmalloc(keylen + 1);
memcpy(copy, key, keylen);
copy[keylen] = '\0';
/* Is there a length limit or whatnot? */
switch (copy[0]) {
case 'l':
if (copy[1] != ':')
break;
literal = 1;
copy += 2;
break;
case 'm':
if (copy[1] != ':')
break;
compare = -2;
copy += 2;
break;
case 'C':
if (copy[1] != ':')
break;
search = 1;
copy += 2;
break;
case '|':
if (copy[1] != '|' || copy[2] != ':')
break;
compare = -3;
copy += 3;
break;
case '&':
if (copy[1] != '&' || copy[2] != ':')
break;
compare = -4;
copy += 3;
break;
case '!':
if (copy[1] == '=' && copy[2] == ':') {
compare = -1;
copy += 3;
break;
}
break;
case '=':
if (copy[1] == '=' && copy[2] == ':') {
compare = 1;
copy += 3;
break;
}
errno = 0;
limit = strtol(copy + 1, &endptr, 10);
if (errno == ERANGE && (limit == LONG_MIN || limit == LONG_MAX))
break;