mirror of
https://github.com/tmate-io/tmate.git
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291 lines
6.0 KiB
C
291 lines
6.0 KiB
C
/* $Id: cmd-string.c,v 1.10 2009-01-10 01:51:21 nicm Exp $ */
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/*
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* Copyright (c) 2008 Nicholas Marriott <nicm@users.sourceforge.net>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
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* IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
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* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <sys/types.h>
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#include <errno.h>
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include "tmux.h"
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/*
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* Parse a command from a string.
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*/
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int cmd_string_getc(const char *, size_t *);
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void cmd_string_ungetc(const char *, size_t *);
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char *cmd_string_string(const char *, size_t *, char, int);
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char *cmd_string_variable(const char *, size_t *);
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int
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cmd_string_getc(const char *s, size_t *p)
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{
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if (s[*p] == '\0')
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return (EOF);
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return (s[(*p)++]);
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}
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void
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cmd_string_ungetc(unused const char *s, size_t *p)
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{
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(*p)--;
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}
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/*
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* Parse command string. Returns -1 on error. If returning -1, cause is error
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* string, or NULL for empty command.
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*/
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int
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cmd_string_parse(const char *s, struct cmd **cmd, char **cause)
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{
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size_t p;
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int ch, argc, rval;
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char **argv, *buf, *t, *u;
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size_t len;
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if ((t = strchr(s, ' ')) == NULL && (t = strchr(s, '\t')) == NULL)
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t = strchr(s, '\0');
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if ((u = strchr(s, '=')) != NULL && u < t) {
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if (putenv(s) != 0) {
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xasprintf(cause, "assignment failed: %s", s);
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return (-1);
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}
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*cmd = NULL;
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return (0);
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}
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argv = NULL;
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argc = 0;
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buf = NULL;
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len = 0;
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*cause = NULL;
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*cmd = NULL;
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rval = -1;
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p = 0;
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for (;;) {
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ch = cmd_string_getc(s, &p);
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switch (ch) {
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case '\'':
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if ((t = cmd_string_string(s, &p, '\'', 0)) == NULL)
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goto error;
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buf = xrealloc(buf, 1, len + strlen(t) + 1);
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strlcpy(buf + len, t, strlen(t) + 1);
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len += strlen(t);
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break;
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case '"':
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if ((t = cmd_string_string(s, &p, '"', 1)) == NULL)
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goto error;
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buf = xrealloc(buf, 1, len + strlen(t) + 1);
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strlcpy(buf + len, t, strlen(t) + 1);
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len += strlen(t);
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break;
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case '$':
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if ((t = cmd_string_variable(s, &p)) == NULL)
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goto error;
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buf = xrealloc(buf, 1, len + strlen(t) + 1);
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strlcpy(buf + len, t, strlen(t) + 1);
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len += strlen(t);
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break;
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case '#':
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/* Comment: discard rest of line. */
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while ((ch = cmd_string_getc(s, &p)) != EOF)
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;
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/* FALLTHROUGH */
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case EOF:
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case ' ':
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case '\t':
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if (len != 0) {
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buf = xrealloc(buf, 1, len + 1);
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buf[len] = '\0';
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argv = xrealloc(argv, argc + 1, sizeof *argv);
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argv[argc++] = buf;
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buf = NULL;
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len = 0;
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}
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if (ch != EOF)
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break;
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if (argc == 0)
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goto out;
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if ((*cmd = cmd_parse(argc, argv, cause)) == NULL)
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goto out;
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rval = 0;
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goto out;
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default:
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if (len >= SIZE_MAX - 2)
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goto error;
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buf = xrealloc(buf, 1, len + 1);
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buf[len++] = ch;
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break;
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}
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}
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error:
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xasprintf(cause, "invalid or unknown command: %s", s);
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out:
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if (buf != NULL)
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xfree(buf);
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while (--argc >= 0)
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xfree(argv[argc]);
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if (argv != NULL)
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xfree(argv);
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return (rval);
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}
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char *
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cmd_string_string(const char *s, size_t *p, char endch, int esc)
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{
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int ch;
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char *buf, *t;
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size_t len;
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buf = NULL;
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len = 0;
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while ((ch = cmd_string_getc(s, p)) != endch) {
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switch (ch) {
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case EOF:
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goto error;
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case '\\':
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if (!esc)
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break;
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switch (ch = cmd_string_getc(s, p)) {
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case EOF:
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goto error;
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case 'r':
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ch = '\r';
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break;
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case 'n':
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ch = '\n';
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break;
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case 't':
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ch = '\t';
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break;
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}
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break;
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case '$':
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if (!esc)
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break;
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if ((t = cmd_string_variable(s, p)) == NULL)
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goto error;
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buf = xrealloc(buf, 1, len + strlen(t) + 1);
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strlcpy(buf + len, t, strlen(t) + 1);
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len += strlen(t);
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continue;
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}
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if (len >= SIZE_MAX - 2)
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goto error;
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buf = xrealloc(buf, 1, len + 1);
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buf[len++] = ch;
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}
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buf = xrealloc(buf, 1, len + 1);
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buf[len] = '\0';
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return (buf);
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error:
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if (buf != NULL)
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xfree(buf);
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return (NULL);
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}
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char *
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cmd_string_variable(const char *s, size_t *p)
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{
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int ch, fch;
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char *buf, *t;
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size_t len;
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#define cmd_string_first(ch) ((ch) == '_' || \
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((ch) >= 'a' && (ch) <= 'z') || ((ch) >= 'A' && (ch) <= 'Z'))
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#define cmd_string_other(ch) ((ch) == '_' || \
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((ch) >= 'a' && (ch) <= 'z') || ((ch) >= 'A' && (ch) <= 'Z') || \
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((ch) >= '0' && (ch) <= '9'))
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buf = NULL;
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len = 0;
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fch = EOF;
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switch (ch = cmd_string_getc(s, p)) {
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case EOF:
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goto error;
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case '{':
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fch = '{';
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ch = cmd_string_getc(s, p);
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if (!cmd_string_first(ch))
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goto error;
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/* FALLTHROUGH */
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default:
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if (!cmd_string_first(ch)) {
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xasprintf(&t, "$%c", ch);
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return (t);
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}
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buf = xrealloc(buf, 1, len + 1);
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buf[len++] = ch;
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for(;;) {
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ch = cmd_string_getc(s, p);
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if (ch == EOF || !cmd_string_other(ch))
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break;
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else {
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if (len >= SIZE_MAX - 3)
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goto error;
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buf = xrealloc(buf, 1, len + 1);
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buf[len++] = ch;
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}
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}
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}
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if (fch == '{' && ch != '}')
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goto error;
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if (ch != EOF && fch != '{')
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cmd_string_ungetc(s, p); /* ch */
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buf = xrealloc(buf, 1, len + 1);
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buf[len] = '\0';
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if ((t = getenv(buf)) == NULL) {
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xfree(buf);
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return (xstrdup(""));
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}
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xfree(buf);
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return (xstrdup(t));
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error:
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if (buf != NULL)
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xfree(buf);
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return (NULL);
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}
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