tmux/cfg.c

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/* $Id: cfg.c,v 1.7 2008-06-14 08:11:17 nicm Exp $ */
/*
* Copyright (c) 2008 Nicholas Marriott <nicm@users.sourceforge.net>
*
* 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 <errno.h>
#include <stdio.h>
#include <string.h>
#include "tmux.h"
/*
* Config file parser. Pretty quick and simple, each line is parsed into a
* argv array and executed as a command.
*/
char *cfg_string(FILE *, char, int);
void printflike2 cfg_print(struct cmd_ctx *, const char *, ...);
void printflike2 cfg_error(struct cmd_ctx *, const char *, ...);
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char *cfg_cause;
void printflike2
cfg_print(unused struct cmd_ctx *ctx, unused const char *fmt, ...)
{
}
void printflike2
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cfg_error(unused struct cmd_ctx *ctx, const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
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xvasprintf(&cfg_cause, fmt, ap);
va_end(ap);
}
int
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load_cfg(const char *path, char **causep)
{
FILE *f;
int ch, argc;
u_int line;
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char **argv, *buf, *s, *cause;
size_t len;
struct cmd *cmd;
struct cmd_ctx ctx;
if ((f = fopen(path, "rb")) == NULL) {
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xasprintf(causep, "%s: %s", path, strerror(errno));
return (1);
}
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cause = NULL;
argv = NULL;
argc = 0;
buf = NULL;
len = 0;
line = 0;
while ((ch = getc(f)) != EOF) {
switch (ch) {
case '\'':
if ((s = cfg_string(f, '\'', 0)) == NULL)
goto error;
argv = xrealloc(argv, argc + 1, sizeof (char *));
argv[argc++] = s;
break;
case '"':
if ((s = cfg_string(f, '"', 1)) == NULL)
goto error;
argv = xrealloc(argv, argc + 1, sizeof (char *));
argv[argc++] = s;
break;
case '#':
/* Comment: discard until EOL. */
while ((ch = getc(f)) != '\n' && ch != EOF)
;
/* FALLTHROUGH */
case '\n':
case EOF:
case ' ':
case '\t':
if (len != 0) {
buf[len] = '\0';
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argv = xrealloc(
argv, argc + 1, sizeof (char *));
argv[argc++] = buf;
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buf = NULL;
len = 0;
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}
if (ch != '\n' && ch != EOF)
break;
line++;
if (argc == 0)
break;
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if ((cmd = cmd_parse(argc, argv, &cause)) == NULL)
goto error;
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ctx.msgdata = NULL;
ctx.cursession = NULL;
ctx.curclient = NULL;
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ctx.error = cfg_error;
ctx.print = cfg_print;
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ctx.cmdclient = NULL;
ctx.flags = 0;
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cfg_cause = NULL;
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cmd_exec(cmd, &ctx);
cmd_free(cmd);
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if (cfg_cause != NULL) {
cause = cfg_cause;
goto error;
}
while (--argc >= 0)
xfree(argv[argc]);
argc = 0;
break;
default:
if (len >= SIZE_MAX - 2)
goto error;
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buf = xrealloc(buf, 1, len + 1);
buf[len++] = ch;
break;
}
}
fclose(f);
return (0);
error:
while (--argc >= 0)
xfree(argv[argc]);
xfree(argv);
if (buf != NULL)
xfree(buf);
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if (cause == NULL)
xasprintf(causep, "%s: error at line %u", path, line);
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else
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xasprintf(causep, "%s: %s at line %u", path, cause, line);
return (1);
}
char *
cfg_string(FILE *f, char endch, int esc)
{
int ch;
char *buf;
size_t len;
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buf = xmalloc(1);
len = 0;
while ((ch = getc(f)) != endch) {
switch (ch) {
case EOF:
xfree(buf);
return (NULL);
case '\\':
if (!esc)
break;
switch (ch = getc(f)) {
case EOF:
xfree(buf);
return (NULL);
case 'r':
ch = '\r';
break;
case 'n':
ch = '\n';
break;
case 't':
ch = '\t';
break;
}
break;
}
if (len >= SIZE_MAX - 2) {
xfree(buf);
return (NULL);
}
buf = xrealloc(buf, 1, len + 1);
buf[len++] = ch;
}
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buf[len] = '\0';
return (buf);
}