scan.c revision 1b5d61b8 
1/*
2 * Copyright (c) 1997  Metro Link Incorporated
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice shall be included in
12 * all copies or substantial portions of the Software.
13 *
14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
17 * THE X CONSORTIUM BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
18 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF
19 * OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
20 * SOFTWARE.
21 *
22 * Except as contained in this notice, the name of the Metro Link shall not be
23 * used in advertising or otherwise to promote the sale, use or other dealings
24 * in this Software without prior written authorization from Metro Link.
25 *
26 */
27/*
28 * Copyright (c) 1997-2003 by The XFree86 Project, Inc.
29 *
30 * Permission is hereby granted, free of charge, to any person obtaining a
31 * copy of this software and associated documentation files (the "Software"),
32 * to deal in the Software without restriction, including without limitation
33 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
34 * and/or sell copies of the Software, and to permit persons to whom the
35 * Software is furnished to do so, subject to the following conditions:
36 *
37 * The above copyright notice and this permission notice shall be included in
38 * all copies or substantial portions of the Software.
39 *
40 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
41 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
42 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
43 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
44 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
45 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
46 * OTHER DEALINGS IN THE SOFTWARE.
47 *
48 * Except as contained in this notice, the name of the copyright holder(s)
49 * and author(s) shall not be used in advertising or otherwise to promote
50 * the sale, use or other dealings in this Software without prior written
51 * authorization from the copyright holder(s) and author(s).
52 */
53
54#ifdef HAVE_XORG_CONFIG_H
55#include <xorg-config.h>
56#endif
57
58#include <ctype.h>
59#include <stdio.h>
60#include <stdlib.h>
61#include <string.h>
62#include <sys/types.h>
63#include <dirent.h>
64#include <unistd.h>
65#include <stdarg.h>
66#include <X11/Xdefs.h>
67#include <X11/Xfuncproto.h>
68#include <limits.h>
69
70#if !defined(MAXHOSTNAMELEN)
71#define MAXHOSTNAMELEN 32
72#endif                          /* !MAXHOSTNAMELEN */
73
74/* For PATH_MAX */
75#include "misc.h"
76
77#include "Configint.h"
78#include "xf86tokens.h"
79
80#define CONFIG_BUF_LEN     1024
81#define CONFIG_MAX_FILES   64
82
83static struct {
84    FILE *file;
85    char *path;
86} configFiles[CONFIG_MAX_FILES];
87static const char **builtinConfig = NULL;
88static int builtinIndex = 0;
89static int configPos = 0;       /* current readers position */
90static int configLineNo = 0;    /* linenumber */
91static char *configBuf, *configRBuf;    /* buffer for lines */
92static char *configSection = NULL;      /* name of current section being parsed */
93static int numFiles = 0;        /* number of config files */
94static int curFileIndex = 0;    /* index of current config file */
95static int pushToken = LOCK_TOKEN;
96static int eol_seen = 0;        /* private state to handle comments */
97LexRec xf86_lex_val;
98
99/*
100 * xf86getNextLine --
101 *
102 *  read from the configFiles FILE stream until we encounter a new
103 *  line; this is effectively just a big wrapper for fgets(3).
104 *
105 *  xf86getToken() assumes that we will read up to the next
106 *  newline; we need to grow configBuf and configRBuf as needed to
107 *  support that.
108 */
109
110static char *
111xf86getNextLine(void)
112{
113    static int configBufLen = CONFIG_BUF_LEN;
114    char *tmpConfigBuf, *tmpConfigRBuf;
115    int c, i, pos = 0, eolFound = 0;
116    char *ret = NULL;
117
118    /*
119     * reallocate the string if it was grown last time (i.e., is no
120     * longer CONFIG_BUF_LEN); we malloc the new strings first, so
121     * that if either of the mallocs fail, we can fall back on the
122     * existing buffer allocations
123     */
124
125    if (configBufLen != CONFIG_BUF_LEN) {
126
127        tmpConfigBuf = malloc(CONFIG_BUF_LEN);
128        tmpConfigRBuf = malloc(CONFIG_BUF_LEN);
129
130        if (!tmpConfigBuf || !tmpConfigRBuf) {
131
132            /*
133             * at least one of the mallocs failed; keep the old buffers
134             * and free any partial allocations
135             */
136
137            free(tmpConfigBuf);
138            free(tmpConfigRBuf);
139
140        }
141        else {
142
143            /*
144             * malloc succeeded; free the old buffers and use the new
145             * buffers
146             */
147
148            configBufLen = CONFIG_BUF_LEN;
149
150            free(configBuf);
151            free(configRBuf);
152
153            configBuf = tmpConfigBuf;
154            configRBuf = tmpConfigRBuf;
155        }
156    }
157
158    /* read in another block of chars */
159
160    do {
161        ret = fgets(configBuf + pos, configBufLen - pos - 1,
162                    configFiles[curFileIndex].file);
163
164        if (!ret) {
165            /*
166             * if the file doesn't end in a newline, add one
167             * and trigger another read
168             */
169            if (pos != 0) {
170                strcpy(&configBuf[pos], "\n");
171                ret = configBuf;
172            }
173            else
174                break;
175        }
176
177        /* search for EOL in the new block of chars */
178
179        for (i = pos; i < (configBufLen - 1); i++) {
180            c = configBuf[i];
181
182            if (c == '\0')
183                break;
184
185            if ((c == '\n') || (c == '\r')) {
186                eolFound = 1;
187                break;
188            }
189        }
190
191        /*
192         * if we didn't find EOL, then grow the string and
193         * read in more
194         */
195
196        if (!eolFound) {
197
198            tmpConfigBuf = realloc(configBuf, configBufLen + CONFIG_BUF_LEN);
199            tmpConfigRBuf = realloc(configRBuf, configBufLen + CONFIG_BUF_LEN);
200
201            if (!tmpConfigBuf || !tmpConfigRBuf) {
202
203                /*
204                 * at least one of the reallocations failed; use the
205                 * new allocation that succeeded, but we have to
206                 * fallback to the previous configBufLen size and use
207                 * the string we have, even though we don't have an
208                 * EOL
209                 */
210
211                if (tmpConfigBuf)
212                    configBuf = tmpConfigBuf;
213                if (tmpConfigRBuf)
214                    configRBuf = tmpConfigRBuf;
215
216                break;
217
218            }
219            else {
220
221                /* reallocation succeeded */
222
223                configBuf = tmpConfigBuf;
224                configRBuf = tmpConfigRBuf;
225                pos = i;
226                configBufLen += CONFIG_BUF_LEN;
227            }
228        }
229
230    } while (!eolFound);
231
232    return ret;
233}
234
235static int
236StringToToken(const char *str, const xf86ConfigSymTabRec * tab)
237{
238    int i;
239
240    for (i = 0; tab[i].token != -1; i++) {
241        if (!xf86nameCompare(tab[i].name, str))
242            return tab[i].token;
243    }
244    return ERROR_TOKEN;
245}
246
247/*
248 * xf86getToken --
249 *      Read next Token from the config file. Handle the global variable
250 *      pushToken.
251 */
252int
253xf86getToken(const xf86ConfigSymTabRec * tab)
254{
255    int c, i;
256
257    /*
258     * First check whether pushToken has a different value than LOCK_TOKEN.
259     * In this case rBuf[] contains a valid STRING/TOKEN/NUMBER. But in the
260     * oth * case the next token must be read from the input.
261     */
262    if (pushToken == EOF_TOKEN)
263        return EOF_TOKEN;
264    else if (pushToken == LOCK_TOKEN) {
265        /*
266         * eol_seen is only set for the first token after a newline.
267         */
268        eol_seen = 0;
269
270        c = configBuf[configPos];
271
272        /*
273         * Get start of next Token. EOF is handled,
274         * whitespaces are skipped.
275         */
276
277 again:
278        if (!c) {
279            char *ret;
280
281            if (numFiles > 0)
282                ret = xf86getNextLine();
283            else {
284                if (builtinConfig[builtinIndex] == NULL)
285                    ret = NULL;
286                else {
287                    strlcpy(configBuf,
288                            builtinConfig[builtinIndex], CONFIG_BUF_LEN);
289                    ret = configBuf;
290                    builtinIndex++;
291                }
292            }
293            if (ret == NULL) {
294                /*
295                 * if necessary, move to the next file and
296                 * read the first line
297                 */
298                if (curFileIndex + 1 < numFiles) {
299                    curFileIndex++;
300                    configLineNo = 0;
301                    goto again;
302                }
303                else
304                    return pushToken = EOF_TOKEN;
305            }
306            configLineNo++;
307            configPos = 0;
308            eol_seen = 1;
309        }
310
311        i = 0;
312        for (;;) {
313            c = configBuf[configPos++];
314            configRBuf[i++] = c;
315            switch (c) {
316            case ' ':
317            case '\t':
318            case '\r':
319                continue;
320            case '\n':
321                i = 0;
322                continue;
323            }
324            break;
325        }
326        if (c == '\0')
327            goto again;
328
329        if (c == '#') {
330            do {
331                configRBuf[i++] = (c = configBuf[configPos++]);
332            }
333            while ((c != '\n') && (c != '\r') && (c != '\0'));
334            configRBuf[i] = '\0';
335            /* XXX no private copy.
336             * Use xf86addComment when setting a comment.
337             */
338            xf86_lex_val.str = configRBuf;
339            return COMMENT;
340        }
341
342        /* GJA -- handle '-' and ','  * Be careful: "-hsync" is a keyword. */
343        else if ((c == ',') && !isalpha(configBuf[configPos])) {
344            return COMMA;
345        }
346        else if ((c == '-') && !isalpha(configBuf[configPos])) {
347            return DASH;
348        }
349
350        /*
351         * Numbers are returned immediately ...
352         */
353        if (isdigit(c)) {
354            int base;
355
356            if (c == '0')
357                if ((configBuf[configPos] == 'x') ||
358                    (configBuf[configPos] == 'X')) {
359                    base = 16;
360                    xf86_lex_val.numType = PARSE_HEX;
361                }
362                else {
363                    base = 8;
364                    xf86_lex_val.numType = PARSE_OCTAL;
365                }
366            else {
367                base = 10;
368                xf86_lex_val.numType = PARSE_DECIMAL;
369            }
370
371            configRBuf[0] = c;
372            i = 1;
373            while (isdigit(c = configBuf[configPos++]) ||
374                   (c == '.') || (c == 'x') || (c == 'X') ||
375                   ((base == 16) && (((c >= 'a') && (c <= 'f')) ||
376                                     ((c >= 'A') && (c <= 'F')))))
377                configRBuf[i++] = c;
378            configPos--;        /* GJA -- one too far */
379            configRBuf[i] = '\0';
380            xf86_lex_val.num = strtoul(configRBuf, NULL, 0);
381            xf86_lex_val.realnum = atof(configRBuf);
382            return NUMBER;
383        }
384
385        /*
386         * All Strings START with a \" ...
387         */
388        else if (c == '\"') {
389            i = -1;
390            do {
391                configRBuf[++i] = (c = configBuf[configPos++]);
392            }
393            while ((c != '\"') && (c != '\n') && (c != '\r') && (c != '\0'));
394            configRBuf[i] = '\0';
395            xf86_lex_val.str = malloc(strlen(configRBuf) + 1);
396            strcpy(xf86_lex_val.str, configRBuf);        /* private copy ! */
397            return STRING;
398        }
399
400        /*
401         * ... and now we MUST have a valid token.  The search is
402         * handled later along with the pushed tokens.
403         */
404        else {
405            configRBuf[0] = c;
406            i = 0;
407            do {
408                configRBuf[++i] = (c = configBuf[configPos++]);
409            }
410            while ((c != ' ') && (c != '\t') && (c != '\n') && (c != '\r') &&
411                   (c != '\0') && (c != '#'));
412            --configPos;
413            configRBuf[i] = '\0';
414            i = 0;
415        }
416
417    }
418    else {
419
420        /*
421         * Here we deal with pushed tokens. Reinitialize pushToken again. If
422         * the pushed token was NUMBER || STRING return them again ...
423         */
424        int temp = pushToken;
425
426        pushToken = LOCK_TOKEN;
427
428        if (temp == COMMA || temp == DASH)
429            return temp;
430        if (temp == NUMBER || temp == STRING)
431            return temp;
432    }
433
434    /*
435     * Joop, at last we have to lookup the token ...
436     */
437    if (tab)
438        return StringToToken(configRBuf, tab);
439
440    return ERROR_TOKEN;         /* Error catcher */
441}
442
443int
444xf86getSubToken(char **comment)
445{
446    int token;
447
448    for (;;) {
449        token = xf86getToken(NULL);
450        if (token == COMMENT) {
451            if (comment)
452                *comment = xf86addComment(*comment, xf86_lex_val.str);
453        }
454        else
455            return token;
456    }
457 /*NOTREACHED*/}
458
459int
460xf86getSubTokenWithTab(char **comment, const xf86ConfigSymTabRec * tab)
461{
462    int token;
463
464    for (;;) {
465        token = xf86getToken(tab);
466        if (token == COMMENT) {
467            if (comment)
468                *comment = xf86addComment(*comment, xf86_lex_val.str);
469        }
470        else
471            return token;
472    }
473 /*NOTREACHED*/}
474
475void
476xf86unGetToken(int token)
477{
478    pushToken = token;
479}
480
481char *
482xf86tokenString(void)
483{
484    return configRBuf;
485}
486
487int
488xf86pathIsAbsolute(const char *path)
489{
490    if (path && path[0] == '/')
491        return 1;
492    return 0;
493}
494
495/* A path is "safe" if it is relative and if it contains no ".." elements. */
496int
497xf86pathIsSafe(const char *path)
498{
499    if (xf86pathIsAbsolute(path))
500        return 0;
501
502    /* Compare with ".." */
503    if (!strcmp(path, ".."))
504        return 0;
505
506    /* Look for leading "../" */
507    if (!strncmp(path, "../", 3))
508        return 0;
509
510    /* Look for trailing "/.." */
511    if ((strlen(path) > 3) && !strcmp(path + strlen(path) - 3, "/.."))
512        return 0;
513
514    /* Look for "/../" */
515    if (strstr(path, "/../"))
516        return 0;
517
518    return 1;
519}
520
521/*
522 * This function substitutes the following escape sequences:
523 *
524 *    %A    cmdline argument as an absolute path (must be absolute to match)
525 *    %R    cmdline argument as a relative path
526 *    %S    cmdline argument as a "safe" path (relative, and no ".." elements)
527 *    %X    default config file name ("xorg.conf")
528 *    %H    hostname
529 *    %E    config file environment ($XORGCONFIG) as an absolute path
530 *    %F    config file environment ($XORGCONFIG) as a relative path
531 *    %G    config file environment ($XORGCONFIG) as a safe path
532 *    %P    projroot
533 *    %C    sysconfdir
534 *    %D    datadir
535 *    %%    %
536 */
537
538#define XCONFIGSUFFIX	".conf"
539#define XCONFENV	"XORGCONFIG"
540
541#define BAIL_OUT		do {									\
542							free(result);				\
543							return NULL;						\
544						} while (0)
545
546#define CHECK_LENGTH	do {									\
547							if (l > PATH_MAX) {					\
548								BAIL_OUT;						\
549							}									\
550						} while (0)
551
552#define APPEND_STR(s)	do {									\
553							if (strlen(s) + l > PATH_MAX) {		\
554								BAIL_OUT;						\
555							} else {							\
556								strcpy(result + l, s);			\
557								l += strlen(s);					\
558							}									\
559						} while (0)
560
561static char *
562DoSubstitution(const char *template, const char *cmdline, const char *projroot,
563               int *cmdlineUsed, int *envUsed, const char *XConfigFile)
564{
565    char *result;
566    int i, l;
567    static const char *env = NULL;
568    static char *hostname = NULL;
569
570    if (!template)
571        return NULL;
572
573    if (cmdlineUsed)
574        *cmdlineUsed = 0;
575    if (envUsed)
576        *envUsed = 0;
577
578    result = malloc(PATH_MAX + 1);
579    l = 0;
580    for (i = 0; template[i]; i++) {
581        if (template[i] != '%') {
582            result[l++] = template[i];
583            CHECK_LENGTH;
584        }
585        else {
586            switch (template[++i]) {
587            case 'A':
588                if (cmdline && xf86pathIsAbsolute(cmdline)) {
589                    APPEND_STR(cmdline);
590                    if (cmdlineUsed)
591                        *cmdlineUsed = 1;
592                }
593                else
594                    BAIL_OUT;
595                break;
596            case 'R':
597                if (cmdline && !xf86pathIsAbsolute(cmdline)) {
598                    APPEND_STR(cmdline);
599                    if (cmdlineUsed)
600                        *cmdlineUsed = 1;
601                }
602                else
603                    BAIL_OUT;
604                break;
605            case 'S':
606                if (cmdline && xf86pathIsSafe(cmdline)) {
607                    APPEND_STR(cmdline);
608                    if (cmdlineUsed)
609                        *cmdlineUsed = 1;
610                }
611                else
612                    BAIL_OUT;
613                break;
614            case 'X':
615                APPEND_STR(XConfigFile);
616                break;
617            case 'H':
618                if (!hostname) {
619                    if ((hostname = malloc(MAXHOSTNAMELEN + 1))) {
620                        if (gethostname(hostname, MAXHOSTNAMELEN) == 0) {
621                            hostname[MAXHOSTNAMELEN] = '\0';
622                        }
623                        else {
624                            free(hostname);
625                            hostname = NULL;
626                        }
627                    }
628                }
629                if (hostname)
630                    APPEND_STR(hostname);
631                break;
632            case 'E':
633                if (!env)
634                    env = getenv(XCONFENV);
635                if (env && xf86pathIsAbsolute(env)) {
636                    APPEND_STR(env);
637                    if (envUsed)
638                        *envUsed = 1;
639                }
640                else
641                    BAIL_OUT;
642                break;
643            case 'F':
644                if (!env)
645                    env = getenv(XCONFENV);
646                if (env && !xf86pathIsAbsolute(env)) {
647                    APPEND_STR(env);
648                    if (envUsed)
649                        *envUsed = 1;
650                }
651                else
652                    BAIL_OUT;
653                break;
654            case 'G':
655                if (!env)
656                    env = getenv(XCONFENV);
657                if (env && xf86pathIsSafe(env)) {
658                    APPEND_STR(env);
659                    if (envUsed)
660                        *envUsed = 1;
661                }
662                else
663                    BAIL_OUT;
664                break;
665            case 'P':
666                if (projroot && xf86pathIsAbsolute(projroot))
667                    APPEND_STR(projroot);
668                else
669                    BAIL_OUT;
670                break;
671            case 'C':
672                APPEND_STR(SYSCONFDIR);
673                break;
674            case 'D':
675                APPEND_STR(DATADIR);
676                break;
677            case '%':
678                result[l++] = '%';
679                CHECK_LENGTH;
680                break;
681            default:
682                fprintf(stderr, "invalid escape %%%c found in path template\n",
683                        template[i]);
684                BAIL_OUT;
685                break;
686            }
687        }
688    }
689#ifdef DEBUG
690    fprintf(stderr, "Converted `%s' to `%s'\n", template, result);
691#endif
692    return result;
693}
694
695/*
696 * Given some searching parameters, locate and open the xorg config file.
697 */
698static char *
699OpenConfigFile(const char *path, const char *cmdline, const char *projroot,
700               const char *confname)
701{
702    char *filepath = NULL;
703    char *pathcopy;
704    const char *template;
705    int cmdlineUsed = 0;
706    FILE *file = NULL;
707
708    pathcopy = strdup(path);
709    for (template = strtok(pathcopy, ","); template && !file;
710         template = strtok(NULL, ",")) {
711        filepath = DoSubstitution(template, cmdline, projroot,
712                                  &cmdlineUsed, NULL, confname);
713        if (!filepath)
714            continue;
715        if (cmdline && !cmdlineUsed) {
716            free(filepath);
717            filepath = NULL;
718            continue;
719        }
720        file = fopen(filepath, "r");
721        if (!file) {
722            free(filepath);
723            filepath = NULL;
724        }
725    }
726
727    free(pathcopy);
728    if (file) {
729        configFiles[numFiles].file = file;
730        configFiles[numFiles].path = strdup(filepath);
731        numFiles++;
732    }
733    return filepath;
734}
735
736/*
737 * Match non-hidden files in the xorg config directory with a .conf
738 * suffix. This filter is passed to scandir(3).
739 */
740static int
741ConfigFilter(const struct dirent *de)
742{
743    const char *name = de->d_name;
744    size_t len;
745    size_t suflen = strlen(XCONFIGSUFFIX);
746
747    if (!name || name[0] == '.')
748        return 0;
749    len = strlen(name);
750    if (len <= suflen)
751        return 0;
752    if (strcmp(&name[len - suflen], XCONFIGSUFFIX) != 0)
753        return 0;
754    return 1;
755}
756
757static Bool
758AddConfigDirFiles(const char *dirpath, struct dirent **list, int num)
759{
760    int i;
761    Bool openedFile = FALSE;
762    Bool warnOnce = FALSE;
763
764    for (i = 0; i < num; i++) {
765        char *path;
766        FILE *file;
767
768        if (numFiles >= CONFIG_MAX_FILES) {
769            if (!warnOnce) {
770                ErrorF("Maximum number of configuration " "files opened\n");
771                warnOnce = TRUE;
772            }
773            continue;
774        }
775
776        path = malloc(PATH_MAX + 1);
777        snprintf(path, PATH_MAX + 1, "%s/%s", dirpath, list[i]->d_name);
778        file = fopen(path, "r");
779        if (!file) {
780            free(path);
781            continue;
782        }
783        openedFile = TRUE;
784
785        configFiles[numFiles].file = file;
786        configFiles[numFiles].path = path;
787        numFiles++;
788    }
789
790    return openedFile;
791}
792
793/*
794 * Given some searching parameters, locate and open the xorg config
795 * directory. The directory does not need to contain config files.
796 */
797static char *
798OpenConfigDir(const char *path, const char *cmdline, const char *projroot,
799              const char *confname)
800{
801    char *dirpath = NULL, *pathcopy;
802    const char *template;
803    Bool found = FALSE;
804    int cmdlineUsed = 0;
805
806    pathcopy = strdup(path);
807    for (template = strtok(pathcopy, ","); template && !found;
808         template = strtok(NULL, ",")) {
809        struct dirent **list = NULL;
810        int num;
811
812        dirpath = DoSubstitution(template, cmdline, projroot,
813                                 &cmdlineUsed, NULL, confname);
814        if (!dirpath)
815            continue;
816        if (cmdline && !cmdlineUsed) {
817            free(dirpath);
818            dirpath = NULL;
819            continue;
820        }
821
822        /* match files named *.conf */
823        num = scandir(dirpath, &list, ConfigFilter, alphasort);
824        if (num < 0) {
825            list = NULL;
826            num = 0;
827        }
828        found = AddConfigDirFiles(dirpath, list, num);
829        if (!found) {
830            free(dirpath);
831            dirpath = NULL;
832        }
833        while (num--)
834            free(list[num]);
835        free(list);
836    }
837
838    free(pathcopy);
839    return dirpath;
840}
841
842/*
843 * xf86initConfigFiles -- Setup global variables and buffers.
844 */
845void
846xf86initConfigFiles(void)
847{
848    curFileIndex = 0;
849    configPos = 0;
850    configLineNo = 0;
851    pushToken = LOCK_TOKEN;
852
853    configBuf = malloc(CONFIG_BUF_LEN);
854    configRBuf = malloc(CONFIG_BUF_LEN);
855    configBuf[0] = '\0';        /* sanity ... */
856}
857
858/*
859 * xf86openConfigFile --
860 *
861 * This function take a config file search path (optional), a command-line
862 * specified file name (optional) and the ProjectRoot path (optional) and
863 * locates and opens a config file based on that information.  If a
864 * command-line file name is specified, then this function fails if none
865 * of the located files.
866 *
867 * The return value is a pointer to the actual name of the file that was
868 * opened.  When no file is found, the return value is NULL. The caller should
869 * free() the returned value.
870 *
871 * The escape sequences allowed in the search path are defined above.
872 *
873 */
874
875#ifndef DEFAULT_CONF_PATH
876#define DEFAULT_CONF_PATH	"/etc/X11/%S," \
877							"%P/etc/X11/%S," \
878							"/etc/X11/%G," \
879							"%P/etc/X11/%G," \
880							"/etc/X11/%X-%M," \
881							"/etc/X11/%X," \
882							"/etc/%X," \
883							"%P/etc/X11/%X.%H," \
884							"%P/etc/X11/%X-%M," \
885							"%P/etc/X11/%X," \
886							"%P/lib/X11/%X.%H," \
887							"%P/lib/X11/%X-%M," \
888							"%P/lib/X11/%X"
889#endif
890
891char *
892xf86openConfigFile(const char *path, const char *cmdline, const char *projroot)
893{
894    if (!path || !path[0])
895        path = DEFAULT_CONF_PATH;
896    if (!projroot || !projroot[0])
897        projroot = PROJECTROOT;
898
899    /* Search for a config file */
900    return OpenConfigFile(path, cmdline, projroot, XCONFIGFILE);
901}
902
903/*
904 * xf86openConfigDirFiles --
905 *
906 * This function take a config directory search path (optional), a
907 * command-line specified directory name (optional) and the ProjectRoot path
908 * (optional) and locates and opens a config directory based on that
909 * information.  If a command-line name is specified, then this function
910 * fails if it is not found.
911 *
912 * The return value is a pointer to the actual name of the directory that was
913 * opened.  When no directory is found, the return value is NULL. The caller
914 * should free() the returned value.
915 *
916 * The escape sequences allowed in the search path are defined above.
917 *
918 */
919char *
920xf86openConfigDirFiles(const char *path, const char *cmdline,
921                       const char *projroot)
922{
923    if (!path || !path[0])
924        path = DEFAULT_CONF_PATH;
925    if (!projroot || !projroot[0])
926        projroot = PROJECTROOT;
927
928    /* Search for the multiconf directory */
929    return OpenConfigDir(path, cmdline, projroot, XCONFIGDIR);
930}
931
932void
933xf86closeConfigFile(void)
934{
935    int i;
936
937    free(configRBuf);
938    configRBuf = NULL;
939    free(configBuf);
940    configBuf = NULL;
941
942    if (numFiles == 0) {
943        builtinConfig = NULL;
944        builtinIndex = 0;
945    }
946    for (i = 0; i < numFiles; i++) {
947        fclose(configFiles[i].file);
948        configFiles[i].file = NULL;
949        free(configFiles[i].path);
950        configFiles[i].path = NULL;
951    }
952    numFiles = 0;
953}
954
955void
956xf86setBuiltinConfig(const char *config[])
957{
958    builtinConfig = config;
959}
960
961void
962xf86parseError(const char *format, ...)
963{
964    va_list ap;
965    const char *filename = numFiles ? configFiles[curFileIndex].path
966        : "<builtin configuration>";
967
968    ErrorF("Parse error on line %d of section %s in file %s\n\t",
969           configLineNo, configSection, filename);
970    va_start(ap, format);
971    VErrorF(format, ap);
972    va_end(ap);
973
974    ErrorF("\n");
975}
976
977void
978xf86validationError(const char *format, ...)
979{
980    va_list ap;
981    const char *filename = numFiles ? configFiles[curFileIndex].path
982        : "<builtin configuration>";
983
984    ErrorF("Data incomplete in file %s\n\t", filename);
985    va_start(ap, format);
986    VErrorF(format, ap);
987    va_end(ap);
988
989    ErrorF("\n");
990}
991
992void
993xf86setSection(const char *section)
994{
995    free(configSection);
996    configSection = strdup(section);
997}
998
999/*
1000 * xf86getToken --
1001 *  Lookup a string if it is actually a token in disguise.
1002 */
1003int
1004xf86getStringToken(const xf86ConfigSymTabRec * tab)
1005{
1006    return StringToToken(xf86_lex_val.str, tab);
1007}
1008
1009/*
1010 * Compare two names.  The characters '_', ' ', and '\t' are ignored
1011 * in the comparison.
1012 */
1013int
1014xf86nameCompare(const char *s1, const char *s2)
1015{
1016    char c1, c2;
1017
1018    if (!s1 || *s1 == 0) {
1019        if (!s2 || *s2 == 0)
1020            return 0;
1021        else
1022            return 1;
1023    } else if (!s2 || *s2 == 0) {
1024        return -1;
1025    }
1026
1027    while (*s1 == '_' || *s1 == ' ' || *s1 == '\t')
1028        s1++;
1029    while (*s2 == '_' || *s2 == ' ' || *s2 == '\t')
1030        s2++;
1031    c1 = (isupper(*s1) ? tolower(*s1) : *s1);
1032    c2 = (isupper(*s2) ? tolower(*s2) : *s2);
1033    while (c1 == c2) {
1034        if (c1 == '\0')
1035            return 0;
1036        s1++;
1037        s2++;
1038        while (*s1 == '_' || *s1 == ' ' || *s1 == '\t')
1039            s1++;
1040        while (*s2 == '_' || *s2 == ' ' || *s2 == '\t')
1041            s2++;
1042        c1 = (isupper(*s1) ? tolower(*s1) : *s1);
1043        c2 = (isupper(*s2) ? tolower(*s2) : *s2);
1044    }
1045    return c1 - c2;
1046}
1047
1048char *
1049xf86addComment(char *cur, const char *add)
1050{
1051    char *str;
1052    const char *cstr;
1053    int len, curlen, iscomment, hasnewline = 0, insnewline, endnewline;
1054
1055    if (add == NULL || add[0] == '\0')
1056        return cur;
1057
1058    if (cur) {
1059        curlen = strlen(cur);
1060        if (curlen)
1061            hasnewline = cur[curlen - 1] == '\n';
1062        eol_seen = 0;
1063    }
1064    else
1065        curlen = 0;
1066
1067    cstr = add;
1068    iscomment = 0;
1069    while (*cstr) {
1070        if (*cstr != ' ' && *cstr != '\t')
1071            break;
1072        ++cstr;
1073    }
1074    iscomment = (*cstr == '#');
1075
1076    len = strlen(add);
1077    endnewline = add[len - 1] == '\n';
1078
1079    insnewline = eol_seen || (curlen && !hasnewline);
1080    if (insnewline)
1081        len++;
1082    if (!iscomment)
1083        len++;
1084    if (!endnewline)
1085        len++;
1086
1087    /* Allocate + 1 char for '\0' terminator. */
1088    str = realloc(cur, curlen + len + 1);
1089    if (!str)
1090        return cur;
1091
1092    cur = str;
1093
1094    if (insnewline)
1095        cur[curlen++] = '\n';
1096    if (!iscomment)
1097        cur[curlen++] = '#';
1098    strcpy(cur + curlen, add);
1099    if (!endnewline)
1100        strcat(cur, "\n");
1101
1102    return cur;
1103}
1104
1105Bool
1106xf86getBoolValue(Bool *val, const char *str)
1107{
1108    if (!val || !str)
1109        return FALSE;
1110    if (*str == '\0') {
1111        *val = TRUE;
1112    }
1113    else {
1114        if (xf86nameCompare(str, "1") == 0)
1115            *val = TRUE;
1116        else if (xf86nameCompare(str, "on") == 0)
1117            *val = TRUE;
1118        else if (xf86nameCompare(str, "true") == 0)
1119            *val = TRUE;
1120        else if (xf86nameCompare(str, "yes") == 0)
1121            *val = TRUE;
1122        else if (xf86nameCompare(str, "0") == 0)
1123            *val = FALSE;
1124        else if (xf86nameCompare(str, "off") == 0)
1125            *val = FALSE;
1126        else if (xf86nameCompare(str, "false") == 0)
1127            *val = FALSE;
1128        else if (xf86nameCompare(str, "no") == 0)
1129            *val = FALSE;
1130        else
1131            return FALSE;
1132    }
1133    return TRUE;
1134}
1135