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Annotation of embedaddon/tmux/cmd-show-environment.c, revision 1.1.1.1

1.1       misho       1: /* $OpenBSD$ */
                      2: 
                      3: /*
                      4:  * Copyright (c) 2009 Nicholas Marriott <nicholas.marriott@gmail.com>
                      5:  *
                      6:  * Permission to use, copy, modify, and distribute this software for any
                      7:  * purpose with or without fee is hereby granted, provided that the above
                      8:  * copyright notice and this permission notice appear in all copies.
                      9:  *
                     10:  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
                     11:  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
                     12:  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
                     13:  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
                     14:  * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
                     15:  * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
                     16:  * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
                     17:  */
                     18: 
                     19: #include <sys/types.h>
                     20: 
                     21: #include <stdlib.h>
                     22: #include <string.h>
                     23: 
                     24: #include "tmux.h"
                     25: 
                     26: /*
                     27:  * Show environment.
                     28:  */
                     29: 
                     30: static enum cmd_retval cmd_show_environment_exec(struct cmd *,
                     31:                            struct cmdq_item *);
                     32: 
                     33: static char    *cmd_show_environment_escape(struct environ_entry *);
                     34: static void     cmd_show_environment_print(struct cmd *, struct cmdq_item *,
                     35:                     struct environ_entry *);
                     36: 
                     37: const struct cmd_entry cmd_show_environment_entry = {
                     38:        .name = "show-environment",
                     39:        .alias = "showenv",
                     40: 
                     41:        .args = { "gst:", 0, 1 },
                     42:        .usage = "[-gs] " CMD_TARGET_SESSION_USAGE " [name]",
                     43: 
                     44:        .tflag = CMD_SESSION_CANFAIL,
                     45: 
                     46:        .flags = CMD_AFTERHOOK,
                     47:        .exec = cmd_show_environment_exec
                     48: };
                     49: 
                     50: static char *
                     51: cmd_show_environment_escape(struct environ_entry *envent)
                     52: {
                     53:        const char      *value = envent->value;
                     54:        char             c, *out, *ret;
                     55: 
                     56:        out = ret = xmalloc(strlen(value) * 2 + 1); /* at most twice the size */
                     57:        while ((c = *value++) != '\0') {
                     58:                /* POSIX interprets $ ` " and \ in double quotes. */
                     59:                if (c == '$' || c == '`' || c == '"' || c == '\\')
                     60:                        *out++ = '\\';
                     61:                *out++ = c;
                     62:        }
                     63:        *out = '\0';
                     64: 
                     65:        return (ret);
                     66: }
                     67: 
                     68: static void
                     69: cmd_show_environment_print(struct cmd *self, struct cmdq_item *item,
                     70:     struct environ_entry *envent)
                     71: {
                     72:        char    *escaped;
                     73: 
                     74:        if (!args_has(self->args, 's')) {
                     75:                if (envent->value != NULL)
                     76:                        cmdq_print(item, "%s=%s", envent->name, envent->value);
                     77:                else
                     78:                        cmdq_print(item, "-%s", envent->name);
                     79:                return;
                     80:        }
                     81: 
                     82:        if (envent->value != NULL) {
                     83:                escaped = cmd_show_environment_escape(envent);
                     84:                cmdq_print(item, "%s=\"%s\"; export %s;", envent->name, escaped,
                     85:                    envent->name);
                     86:                free(escaped);
                     87:        } else
                     88:                cmdq_print(item, "unset %s;", envent->name);
                     89: }
                     90: 
                     91: static enum cmd_retval
                     92: cmd_show_environment_exec(struct cmd *self, struct cmdq_item *item)
                     93: {
                     94:        struct args             *args = self->args;
                     95:        struct environ          *env;
                     96:        struct environ_entry    *envent;
                     97:        const char              *target;
                     98: 
                     99:        if ((target = args_get(args, 't')) != NULL) {
                    100:                if (item->state.tflag.s == NULL) {
                    101:                        cmdq_error(item, "no such session: %s", target);
                    102:                        return (CMD_RETURN_ERROR);
                    103:                }
                    104:        }
                    105: 
                    106:        if (args_has(self->args, 'g'))
                    107:                env = global_environ;
                    108:        else {
                    109:                if (item->state.tflag.s == NULL) {
                    110:                        target = args_get(args, 't');
                    111:                        if (target != NULL)
                    112:                                cmdq_error(item, "no such session: %s", target);
                    113:                        else
                    114:                                cmdq_error(item, "no current session");
                    115:                        return (CMD_RETURN_ERROR);
                    116:                }
                    117:                env = item->state.tflag.s->environ;
                    118:        }
                    119: 
                    120:        if (args->argc != 0) {
                    121:                envent = environ_find(env, args->argv[0]);
                    122:                if (envent == NULL) {
                    123:                        cmdq_error(item, "unknown variable: %s", args->argv[0]);
                    124:                        return (CMD_RETURN_ERROR);
                    125:                }
                    126:                cmd_show_environment_print(self, item, envent);
                    127:                return (CMD_RETURN_NORMAL);
                    128:        }
                    129: 
                    130:        envent = environ_first(env);
                    131:        while (envent != NULL) {
                    132:                cmd_show_environment_print(self, item, envent);
                    133:                envent = environ_next(envent);
                    134:        }
                    135:        return (CMD_RETURN_NORMAL);
                    136: }