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xenocara/xserver/hw/xfree86/parser/scan.c

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/*
* Copyright (c) 1997 Metro Link Incorporated
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE X CONSORTIUM BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF
* OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*
* Except as contained in this notice, the name of the Metro Link shall not be
* used in advertising or otherwise to promote the sale, use or other dealings
* in this Software without prior written authorization from Metro Link.
*
*/
/*
* Copyright (c) 1997-2003 by The XFree86 Project, Inc.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*
* Except as contained in this notice, the name of the copyright holder(s)
* and author(s) shall not be used in advertising or otherwise to promote
* the sale, use or other dealings in this Software without prior written
* authorization from the copyright holder(s) and author(s).
*/
/* View/edit this file with tab stops set to 4 */
#ifdef HAVE_XORG_CONFIG_H
#include <xorg-config.h>
#endif
#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <stdarg.h>
#include <X11/Xfuncproto.h>
#if defined(_POSIX_SOURCE)
#include <limits.h>
#else
#define _POSIX_SOURCE
#include <limits.h>
#undef _POSIX_SOURCE
#endif /* _POSIX_SOURCE */
#if !defined(PATH_MAX)
#if defined(MAXPATHLEN)
#define PATH_MAX MAXPATHLEN
#else
#define PATH_MAX 1024
#endif /* MAXPATHLEN */
#endif /* !PATH_MAX */
#if !defined(MAXHOSTNAMELEN)
#define MAXHOSTNAMELEN 32
#endif /* !MAXHOSTNAMELEN */
#include "Configint.h"
#include "xf86tokens.h"
#define CONFIG_BUF_LEN 1024
static int StringToToken (char *, xf86ConfigSymTabRec *);
static FILE *configFile = NULL;
static const char **builtinConfig = NULL;
static int builtinIndex = 0;
static int configPos = 0; /* current readers position */
static int configLineNo = 0; /* linenumber */
static char *configBuf, *configRBuf; /* buffer for lines */
static char *configPath; /* path to config file */
static char *configSection = NULL; /* name of current section being parsed */
static int pushToken = LOCK_TOKEN;
static int eol_seen = 0; /* private state to handle comments */
LexRec val;
/*
* xf86strToUL --
*
* A portable, but restricted, version of strtoul(). It only understands
* hex, octal, and decimal. But it's good enough for our needs.
*/
static unsigned int
xf86strToUL (char *str)
{
int base = 10;
char *p = str;
unsigned int tot = 0;
if (*p == '0')
{
p++;
if ((*p == 'x') || (*p == 'X'))
{
p++;
base = 16;
}
else
base = 8;
}
while (*p)
{
if ((*p >= '0') && (*p <= ((base == 8) ? '7' : '9')))
{
tot = tot * base + (*p - '0');
}
else if ((base == 16) && (*p >= 'a') && (*p <= 'f'))
{
tot = tot * base + 10 + (*p - 'a');
}
else if ((base == 16) && (*p >= 'A') && (*p <= 'F'))
{
tot = tot * base + 10 + (*p - 'A');
}
else
{
return (tot);
}
p++;
}
return (tot);
}
/*
* xf86getNextLine --
*
* read from the configFile FILE stream until we encounter a new
* line; this is effectively just a big wrapper for fgets(3).
*
* xf86getToken() assumes that we will read up to the next
* newline; we need to grow configBuf and configRBuf as needed to
* support that.
*/
static char*
xf86getNextLine(void)
{
static int configBufLen = CONFIG_BUF_LEN;
char *tmpConfigBuf, *tmpConfigRBuf;
int c, i, pos = 0, eolFound = 0;
char *ret = NULL;
/*
* reallocate the string if it was grown last time (i.e., is no
* longer CONFIG_BUF_LEN); we malloc the new strings first, so
* that if either of the mallocs fail, we can fall back on the
* existing buffer allocations
*/
if (configBufLen != CONFIG_BUF_LEN) {
tmpConfigBuf = xf86confmalloc(CONFIG_BUF_LEN);
tmpConfigRBuf = xf86confmalloc(CONFIG_BUF_LEN);
if (!tmpConfigBuf || !tmpConfigRBuf) {
/*
* at least one of the mallocs failed; keep the old buffers
* and free any partial allocations
*/
xf86conffree(tmpConfigBuf);
xf86conffree(tmpConfigRBuf);
} else {
/*
* malloc succeeded; free the old buffers and use the new
* buffers
*/
configBufLen = CONFIG_BUF_LEN;
xf86conffree(configBuf);
xf86conffree(configRBuf);
configBuf = tmpConfigBuf;
configRBuf = tmpConfigRBuf;
}
}
/* read in another block of chars */
do {
ret = fgets(configBuf + pos, configBufLen - pos - 1, configFile);
if (!ret) break;
/* search for EOL in the new block of chars */
for (i = pos; i < (configBufLen - 1); i++) {
c = configBuf[i];
if (c == '\0') break;
if ((c == '\n') || (c == '\r')) {
eolFound = 1;
break;
}
}
/*
* if we didn't find EOL, then grow the string and
* read in more
*/
if (!eolFound) {
tmpConfigBuf = xf86confrealloc(configBuf, configBufLen + CONFIG_BUF_LEN);
tmpConfigRBuf = xf86confrealloc(configRBuf, configBufLen + CONFIG_BUF_LEN);
if (!tmpConfigBuf || !tmpConfigRBuf) {
/*
* at least one of the reallocations failed; use the
* new allocation that succeeded, but we have to
* fallback to the previous configBufLen size and use
* the string we have, even though we don't have an
* EOL
*/
if (tmpConfigBuf) configBuf = tmpConfigBuf;
if (tmpConfigRBuf) configRBuf = tmpConfigRBuf;
break;
} else {
/* reallocation succeeded */
configBuf = tmpConfigBuf;
configRBuf = tmpConfigRBuf;
pos = i;
configBufLen += CONFIG_BUF_LEN;
}
}
} while (!eolFound);
return (ret);
}
/*
* xf86getToken --
* Read next Token from the config file. Handle the global variable
* pushToken.
*/
int
xf86getToken (xf86ConfigSymTabRec * tab)
{
int c, i;
/*
* First check whether pushToken has a different value than LOCK_TOKEN.
* In this case rBuf[] contains a valid STRING/TOKEN/NUMBER. But in the
* oth * case the next token must be read from the input.
*/
if (pushToken == EOF_TOKEN)
return (EOF_TOKEN);
else if (pushToken == LOCK_TOKEN)
{
/*
* eol_seen is only set for the first token after a newline.
*/
eol_seen = 0;
c = configBuf[configPos];
/*
* Get start of next Token. EOF is handled,
* whitespaces are skipped.
*/
again:
if (!c)
{
char *ret;
if (configFile)
ret = xf86getNextLine();
else {
if (builtinConfig[builtinIndex] == NULL)
ret = NULL;
else {
ret = strncpy(configBuf, builtinConfig[builtinIndex],
CONFIG_BUF_LEN);
builtinIndex++;
}
}
if (ret == NULL)
{
return (pushToken = EOF_TOKEN);
}
configLineNo++;
configPos = 0;
eol_seen = 1;
}
i = 0;
for (;;) {
c = configBuf[configPos++];
configRBuf[i++] = c;
switch (c) {
case ' ':
case '\t':
case '\r':
continue;
case '\n':
i = 0;
continue;
}
break;
}
if (c == '\0')
goto again;
if (c == '#')
{
do
{
configRBuf[i++] = (c = configBuf[configPos++]);
}
while ((c != '\n') && (c != '\r') && (c != '\0'));
configRBuf[i] = '\0';
/* XXX no private copy.
* Use xf86addComment when setting a comment.
*/
val.str = configRBuf;
return (COMMENT);
}
/* GJA -- handle '-' and ',' * Be careful: "-hsync" is a keyword. */
else if ((c == ',') && !isalpha (configBuf[configPos]))
{
return COMMA;
}
else if ((c == '-') && !isalpha (configBuf[configPos]))
{
return DASH;
}
/*
* Numbers are returned immediately ...
*/
if (isdigit (c))
{
int base;
if (c == '0')
if ((configBuf[configPos] == 'x') ||
(configBuf[configPos] == 'X'))
{
base = 16;
val.numType = PARSE_HEX;
}
else
{
base = 8;
val.numType = PARSE_OCTAL;
}
else
{
base = 10;
val.numType = PARSE_DECIMAL;
}
configRBuf[0] = c;
i = 1;
while (isdigit (c = configBuf[configPos++]) ||
(c == '.') || (c == 'x') || (c == 'X') ||
((base == 16) && (((c >= 'a') && (c <= 'f')) ||
((c >= 'A') && (c <= 'F')))))
configRBuf[i++] = c;
configPos--; /* GJA -- one too far */
configRBuf[i] = '\0';
val.num = xf86strToUL (configRBuf);
val.realnum = atof (configRBuf);
return (NUMBER);
}
/*
* All Strings START with a \" ...
*/
else if (c == '\"')
{
i = -1;
do
{
configRBuf[++i] = (c = configBuf[configPos++]);
}
while ((c != '\"') && (c != '\n') && (c != '\r') && (c != '\0'));
configRBuf[i] = '\0';
val.str = xf86confmalloc (strlen (configRBuf) + 1);
strcpy (val.str, configRBuf); /* private copy ! */
return (STRING);
}
/*
* ... and now we MUST have a valid token. The search is
* handled later along with the pushed tokens.
*/
else
{
configRBuf[0] = c;
i = 0;
do
{
configRBuf[++i] = (c = configBuf[configPos++]);
}
while ((c != ' ') && (c != '\t') && (c != '\n') && (c != '\r') && (c != '\0') && (c != '#'));
--configPos;
configRBuf[i] = '\0';
i = 0;
}
}
else
{
/*
* Here we deal with pushed tokens. Reinitialize pushToken again. If
* the pushed token was NUMBER || STRING return them again ...
*/
int temp = pushToken;
pushToken = LOCK_TOKEN;
if (temp == COMMA || temp == DASH)
return (temp);
if (temp == NUMBER || temp == STRING)
return (temp);
}
/*
* Joop, at last we have to lookup the token ...
*/
if (tab)
{
i = 0;
while (tab[i].token != -1)
if (xf86nameCompare (configRBuf, tab[i].name) == 0)
return (tab[i].token);
else
i++;
}
return (ERROR_TOKEN); /* Error catcher */
}
int
xf86getSubToken (char **comment)
{
int token;
for (;;) {
token = xf86getToken(NULL);
if (token == COMMENT) {
if (comment)
*comment = xf86addComment(*comment, val.str);
}
else
return (token);
}
/*NOTREACHED*/
}
int
xf86getSubTokenWithTab (char **comment, xf86ConfigSymTabRec *tab)
{
int token;
for (;;) {
token = xf86getToken(tab);
if (token == COMMENT) {
if (comment)
*comment = xf86addComment(*comment, val.str);
}
else
return (token);
}
/*NOTREACHED*/
}
void
xf86unGetToken (int token)
{
pushToken = token;
}
char *
xf86tokenString (void)
{
return configRBuf;
}
int
xf86pathIsAbsolute(const char *path)
{
if (path && path[0] == '/')
return 1;
return 0;
}
/* A path is "safe" if it is relative and if it contains no ".." elements. */
int
xf86pathIsSafe(const char *path)
{
if (xf86pathIsAbsolute(path))
return 0;
/* Compare with ".." */
if (!strcmp(path, ".."))
return 0;
/* Look for leading "../" */
if (!strncmp(path, "../", 3))
return 0;
/* Look for trailing "/.." */
if ((strlen(path) > 3) && !strcmp(path + strlen(path) - 3, "/.."))
return 0;
/* Look for "/../" */
if (strstr(path, "/../"))
return 0;
return 1;
}
/*
* This function substitutes the following escape sequences:
*
* %A cmdline argument as an absolute path (must be absolute to match)
* %R cmdline argument as a relative path
* %S cmdline argument as a "safe" path (relative, and no ".." elements)
* %X default config file name ("xorg.conf")
* %H hostname
* %E config file environment ($XORGCONFIG) as an absolute path
* %F config file environment ($XORGCONFIG) as a relative path
* %G config file environment ($XORGCONFIG) as a safe path
* %P projroot
* %M major version number
* %% %
*/
#ifndef XCONFIGFILE
#define XCONFIGFILE "xorg.conf"
#endif
#ifndef PROJECTROOT
#define PROJECTROOT "/usr/X11R6"
#endif
#ifndef XCONFENV
#define XCONFENV "XORGCONFIG"
#endif
#define XFREE86CFGFILE "XF86Config"
#ifndef XF86_VERSION_MAJOR
#ifdef XVERSION
#if XVERSION > 40000000
#define XF86_VERSION_MAJOR (XVERSION / 10000000)
#else
#define XF86_VERSION_MAJOR (XVERSION / 1000)
#endif
#else
#define XF86_VERSION_MAJOR 4
#endif
#endif
#define BAIL_OUT do { \
xf86conffree(result); \
return NULL; \
} while (0)
#define CHECK_LENGTH do { \
if (l > PATH_MAX) { \
BAIL_OUT; \
} \
} while (0)
#define APPEND_STR(s) do { \
if (strlen(s) + l > PATH_MAX) { \
BAIL_OUT; \
} else { \
strcpy(result + l, s); \
l += strlen(s); \
} \
} while (0)
static char *
DoSubstitution(const char *template, const char *cmdline, const char *projroot,
int *cmdlineUsed, int *envUsed, char *XConfigFile)
{
char *result;
int i, l;
static const char *env = NULL;
static char *hostname = NULL;
static char majorvers[3] = "";
if (!template)
return NULL;
if (cmdlineUsed)
*cmdlineUsed = 0;
if (envUsed)
*envUsed = 0;
result = xf86confmalloc(PATH_MAX + 1);
l = 0;
for (i = 0; template[i]; i++) {
if (template[i] != '%') {
result[l++] = template[i];
CHECK_LENGTH;
} else {
switch (template[++i]) {
case 'A':
if (cmdline && xf86pathIsAbsolute(cmdline)) {
APPEND_STR(cmdline);
if (cmdlineUsed)
*cmdlineUsed = 1;
} else
BAIL_OUT;
break;
case 'R':
if (cmdline && !xf86pathIsAbsolute(cmdline)) {
APPEND_STR(cmdline);
if (cmdlineUsed)
*cmdlineUsed = 1;
} else
BAIL_OUT;
break;
case 'S':
if (cmdline && xf86pathIsSafe(cmdline)) {
APPEND_STR(cmdline);
if (cmdlineUsed)
*cmdlineUsed = 1;
} else
BAIL_OUT;
break;
case 'X':
APPEND_STR(XConfigFile);
break;
case 'H':
if (!hostname) {
if ((hostname = xf86confmalloc(MAXHOSTNAMELEN + 1))) {
if (gethostname(hostname, MAXHOSTNAMELEN) == 0) {
hostname[MAXHOSTNAMELEN] = '\0';
} else {
xf86conffree(hostname);
hostname = NULL;
}
}
}
if (hostname)
APPEND_STR(hostname);
break;
case 'E':
if (!env)
env = getenv(XCONFENV);
if (env && xf86pathIsAbsolute(env)) {
APPEND_STR(env);
if (envUsed)
*envUsed = 1;
} else
BAIL_OUT;
break;
case 'F':
if (!env)
env = getenv(XCONFENV);
if (env && !xf86pathIsAbsolute(env)) {
APPEND_STR(env);
if (envUsed)
*envUsed = 1;
} else
BAIL_OUT;
break;
case 'G':
if (!env)
env = getenv(XCONFENV);
if (env && xf86pathIsSafe(env)) {
APPEND_STR(env);
if (envUsed)
*envUsed = 1;
} else
BAIL_OUT;
break;
case 'P':
if (projroot && xf86pathIsAbsolute(projroot))
APPEND_STR(projroot);
else
BAIL_OUT;
break;
case 'M':
if (!majorvers[0]) {
if (XF86_VERSION_MAJOR < 0 || XF86_VERSION_MAJOR > 99) {
fprintf(stderr, "XF86_VERSION_MAJOR is out of range\n");
BAIL_OUT;
} else
sprintf(majorvers, "%d", XF86_VERSION_MAJOR);
}
APPEND_STR(majorvers);
break;
case '%':
result[l++] = '%';
CHECK_LENGTH;
break;
default:
fprintf(stderr, "invalid escape %%%c found in path template\n",
template[i]);
BAIL_OUT;
break;
}
}
}
#ifdef DEBUG
fprintf(stderr, "Converted `%s' to `%s'\n", template, result);
#endif
return result;
}
/*
* xf86openConfigFile --
*
* This function take a config file search path (optional), a command-line
* specified file name (optional) and the ProjectRoot path (optional) and
* locates and opens a config file based on that information. If a
* command-line file name is specified, then this function fails if none
* of the located files.
*
* The return value is a pointer to the actual name of the file that was
* opened. When no file is found, the return value is NULL.
*
* The escape sequences allowed in the search path are defined above.
*
*/
#ifndef DEFAULT_CONF_PATH
#define DEFAULT_CONF_PATH "/etc/X11/%S," \
"%P/etc/X11/%S," \
"/etc/X11/%G," \
"%P/etc/X11/%G," \
"/etc/X11/%X-%M," \
"/etc/X11/%X," \
"/etc/%X," \
"%P/etc/X11/%X.%H," \
"%P/etc/X11/%X-%M," \
"%P/etc/X11/%X," \
"%P/lib/X11/%X.%H," \
"%P/lib/X11/%X-%M," \
"%P/lib/X11/%X"
#endif
const char *
xf86openConfigFile(const char *path, const char *cmdline, const char *projroot)
{
char *pathcopy;
const char *template;
int cmdlineUsed = 0;
configFile = NULL;
configPos = 0; /* current readers position */
configLineNo = 0; /* linenumber */
pushToken = LOCK_TOKEN;
if (!path || !path[0])
path = DEFAULT_CONF_PATH;
pathcopy = xf86confmalloc(strlen(path) + 1);
strcpy(pathcopy, path);
if (!projroot || !projroot[0])
projroot = PROJECTROOT;
template = strtok(pathcopy, ",");
/* First, search for a config file. */
while (template && !configFile) {
if ((configPath = DoSubstitution(template, cmdline, projroot,
&cmdlineUsed, NULL,
XCONFIGFILE))) {
if ((configFile = fopen(configPath, "r")) != 0) {
if (cmdline && !cmdlineUsed) {
fclose(configFile);
configFile = NULL;
}
}
}
if (configPath && !configFile) {
xf86conffree(configPath);
configPath = NULL;
}
template = strtok(NULL, ",");
}
/* Then search for fallback */
if (!configFile) {
strcpy(pathcopy, path);
template = strtok(pathcopy, ",");
while (template && !configFile) {
if ((configPath = DoSubstitution(template, cmdline, projroot,
&cmdlineUsed, NULL,
XFREE86CFGFILE))) {
if ((configFile = fopen(configPath, "r")) != 0) {
if (cmdline && !cmdlineUsed) {
fclose(configFile);
configFile = NULL;
}
}
}
if (configPath && !configFile) {
xf86conffree(configPath);
configPath = NULL;
}
template = strtok(NULL, ",");
}
}
xf86conffree(pathcopy);
if (!configFile) {
return NULL;
}
configBuf = xf86confmalloc (CONFIG_BUF_LEN);
configRBuf = xf86confmalloc (CONFIG_BUF_LEN);
configBuf[0] = '\0'; /* sanity ... */
return configPath;
}
void
xf86closeConfigFile (void)
{
xf86conffree (configPath);
configPath = NULL;
xf86conffree (configRBuf);
configRBuf = NULL;
xf86conffree (configBuf);
configBuf = NULL;
if (configFile) {
fclose (configFile);
configFile = NULL;
} else {
builtinConfig = NULL;
builtinIndex = 0;
}
}
void
xf86setBuiltinConfig(const char *config[])
{
builtinConfig = config;
configPath = xf86configStrdup("<builtin configuration>");
configBuf = xf86confmalloc (CONFIG_BUF_LEN);
configRBuf = xf86confmalloc (CONFIG_BUF_LEN);
configBuf[0] = '\0'; /* sanity ... */
}
void
xf86parseError (char *format,...)
{
va_list ap;
ErrorF ("Parse error on line %d of section %s in file %s\n\t",
configLineNo, configSection, configPath);
va_start (ap, format);
VErrorF (format, ap);
va_end (ap);
ErrorF ("\n");
}
void
xf86validationError (char *format,...)
{
va_list ap;
ErrorF ("Data incomplete in file %s\n\t", configPath);
va_start (ap, format);
VErrorF (format, ap);
va_end (ap);
ErrorF ("\n");
}
void
xf86setSection (char *section)
{
if (configSection)
xf86conffree(configSection);
configSection = xf86confmalloc(strlen (section) + 1);
strcpy (configSection, section);
}
/*
* xf86getToken --
* Lookup a string if it is actually a token in disguise.
*/
int
xf86getStringToken (xf86ConfigSymTabRec * tab)
{
return StringToToken (val.str, tab);
}
static int
StringToToken (char *str, xf86ConfigSymTabRec * tab)
{
int i;
for (i = 0; tab[i].token != -1; i++)
{
if (!xf86nameCompare (tab[i].name, str))
return tab[i].token;
}
return (ERROR_TOKEN);
}
/*
* Compare two names. The characters '_', ' ', and '\t' are ignored
* in the comparison.
*/
_X_EXPORT int
xf86nameCompare (const char *s1, const char *s2)
{
char c1, c2;
if (!s1 || *s1 == 0) {
if (!s2 || *s2 == 0)
return (0);
else
return (1);
}
while (*s1 == '_' || *s1 == ' ' || *s1 == '\t')
s1++;
while (*s2 == '_' || *s2 == ' ' || *s2 == '\t')
s2++;
c1 = (isupper (*s1) ? tolower (*s1) : *s1);
c2 = (isupper (*s2) ? tolower (*s2) : *s2);
while (c1 == c2)
{
if (c1 == '\0')
return (0);
s1++;
s2++;
while (*s1 == '_' || *s1 == ' ' || *s1 == '\t')
s1++;
while (*s2 == '_' || *s2 == ' ' || *s2 == '\t')
s2++;
c1 = (isupper (*s1) ? tolower (*s1) : *s1);
c2 = (isupper (*s2) ? tolower (*s2) : *s2);
}
return (c1 - c2);
}
char *
xf86addComment(char *cur, char *add)
{
char *str;
int len, curlen, iscomment, hasnewline = 0, endnewline;
if (add == NULL || add[0] == '\0')
return (cur);
if (cur) {
curlen = strlen(cur);
if (curlen)
hasnewline = cur[curlen - 1] == '\n';
eol_seen = 0;
}
else
curlen = 0;
str = add;
iscomment = 0;
while (*str) {
if (*str != ' ' && *str != '\t')
break;
++str;
}
iscomment = (*str == '#');
len = strlen(add);
endnewline = add[len - 1] == '\n';
len += 1 + iscomment + (!hasnewline) + (!endnewline) + eol_seen;
if ((str = xf86confrealloc(cur, len + curlen)) == NULL)
return (cur);
cur = str;
if (eol_seen || (curlen && !hasnewline))
cur[curlen++] = '\n';
if (!iscomment)
cur[curlen++] = '#';
strcpy(cur + curlen, add);
if (!endnewline)
strcat(cur, "\n");
return (cur);
}
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