/**
 * \file lib/misc.c
 */

#include "system.h"

/*@unchecked@*/
static int _debug = 0;

#include "rpmio_internal.h"
#include <rpmurl.h>
#include <rpmmacro.h>	/* XXX for rpmGetPath */
#include <rpmlib.h>

#include "misc.h"
#include "debug.h"

/*@access Header@*/		/* XXX compared with NULL */
/*@access FD_t@*/		/* XXX compared with NULL */

/* just to put a marker in librpm.a */
const char * RPMVERSION = VERSION;

char ** splitString(const char * str, int length, char sep)
{
    const char * source;
    char * s, * dest;
    char ** list;
    int i;
    int fields;

    s = xmalloc(length + 1);

    fields = 1;
    for (source = str, dest = s, i = 0; i < length; i++, source++, dest++) {
	*dest = *source;
	if (*dest == sep) fields++;
    }

    *dest = '\0';

    list = xmalloc(sizeof(*list) * (fields + 1));

    dest = s;
    list[0] = dest;
    i = 1;
    while (i < fields) {
	if (*dest == sep) {
	    list[i++] = dest + 1;
	    *dest = 0;
	}
	dest++;
    }

    list[i] = NULL;

    return list;
}

void freeSplitString(char ** list)
{
    /*@-unqualifiedtrans@*/
    list[0] = _free(list[0]);
    /*@=unqualifiedtrans@*/
    list = _free(list);
}

int doputenv(const char *str)
{
    char * a;

    /* FIXME: this leaks memory! */
    a = xmalloc(strlen(str) + 1);
    strcpy(a, str);
    return putenv(a);
}

int dosetenv(const char * name, const char * value, int overwrite)
{
    char * a;

    if (!overwrite && getenv(name)) return 0;

    /* FIXME: this leaks memory! */
    a = xmalloc(strlen(name) + strlen(value) + sizeof("="));
    (void) stpcpy( stpcpy( stpcpy( a, name), "="), value);
    return putenv(a);
}

static int rpmMkpath(const char * path, mode_t mode, uid_t uid, gid_t gid)
	/*@globals fileSystem @*/
	/*@modifies fileSystem @*/
{
    char * d, * de;
    int created = 0;
    int rc;

    if (path == NULL)
	return -1;
    d = alloca(strlen(path)+2);
    de = stpcpy(d, path);
    de[1] = '\0';
    for (de = d; *de != '\0'; de++) {
	struct stat st;
	char savec;

	while (*de && *de != '/') de++;
	savec = de[1];
	de[1] = '\0';

	rc = stat(d, &st);
	if (rc) {
	    switch(errno) {
	    default:
		return errno;
		/*@notreached@*/ /*@switchbreak@*/ break;
	    case ENOENT:
		/*@switchbreak@*/ break;
	    }
	    rc = mkdir(d, mode);
	    if (rc)
		return errno;
	    created = 1;
	    if (!(uid == (uid_t) -1 && gid == (gid_t) -1)) {
		rc = chown(d, uid, gid);
		if (rc)
		    return errno;
	    }
	} else if (!S_ISDIR(st.st_mode)) {
	    return ENOTDIR;
	}
	de[1] = savec;
    }
    rc = 0;
    if (created)
	rpmMessage(RPMMESS_WARNING, "created %%_tmppath directory %s\n", path);
    return rc;
}

int makeTempFile(const char * prefix, const char ** fnptr, FD_t * fdptr)
{
    const char * tpmacro = "%{?_tmppath:%{_tmppath}}%{!?_tmppath:/var/tmp}";
    const char * tempfn = NULL;
    const char * tfn = NULL;
    static int _initialized = 0;
    int temput;
    FD_t fd = NULL;
    int ran;

    /*@-branchstate@*/
    if (!prefix) prefix = "";
    /*@=branchstate@*/

    /* Create the temp directory if it doesn't already exist. */
    /*@-branchstate@*/
    if (!_initialized) {
	_initialized = 1;
	tempfn = rpmGenPath(prefix, tpmacro, NULL);
	if (rpmMkpath(tempfn, 0755, (uid_t) -1, (gid_t) -1))
	    goto errxit;
    }
    /*@=branchstate@*/

    /* XXX should probably use mkstemp here */
    srand(time(NULL));
    ran = rand() % 100000;

    /* maybe this should use link/stat? */

    do {
	char tfnbuf[64];
#ifndef	NOTYET
	sprintf(tfnbuf, "rpm-tmp.%d", ran++);
	tempfn = _free(tempfn);
	tempfn = rpmGenPath(prefix, tpmacro, tfnbuf);
#else
	strcpy(tfnbuf, "rpm-tmp.XXXXXX");
	tempfn = _free(tempfn);
	tempfn = rpmGenPath(prefix, tpmacro, mktemp(tfnbuf));
#endif

	temput = urlPath(tempfn, &tfn);
	if (*tfn == '\0') goto errxit;

	switch (temput) {
	case URL_IS_HTTP:
	case URL_IS_DASH:
	    goto errxit;
	    /*@notreached@*/ /*@switchbreak@*/ break;
	default:
	    /*@switchbreak@*/ break;
	}

	fd = Fopen(tempfn, "w+x.ufdio");
	/* XXX FIXME: errno may not be correct for ufdio */
    } while ((fd == NULL || Ferror(fd)) && errno == EEXIST);

    if (fd == NULL || Ferror(fd))
	goto errxit;

    switch(temput) {
    case URL_IS_PATH:
    case URL_IS_UNKNOWN:
      {	struct stat sb, sb2;
	if (!stat(tfn, &sb) && S_ISLNK(sb.st_mode)) {
	    rpmError(RPMERR_SCRIPT, _("error creating temporary file %s\n"), tfn);
	    goto errxit;
	}

	if (sb.st_nlink != 1) {
	    rpmError(RPMERR_SCRIPT, _("error creating temporary file %s\n"), tfn);
	    goto errxit;
	}

	if (fstat(Fileno(fd), &sb2) == 0) {
	    if (sb2.st_ino != sb.st_ino || sb2.st_dev != sb.st_dev) {
		rpmError(RPMERR_SCRIPT, _("error creating temporary file %s\n"), tfn);
		goto errxit;
	    }
	}
      }	break;
    default:
	break;
    }

    /*@-branchstate@*/
    if (fnptr)
	*fnptr = tempfn;
    else 
	tempfn = _free(tempfn);
    /*@=branchstate@*/
    *fdptr = fd;

    return 0;

errxit:
    tempfn = _free(tempfn);
    /*@-usereleased@*/
    if (fd) (void) Fclose(fd);
    /*@=usereleased@*/
    return 1;
}

char * currentDirectory(void)
{
    int currDirLen;
    char * currDir;

    currDirLen = 50;
    currDir = xmalloc(currDirLen);
    while (!getcwd(currDir, currDirLen) && errno == ERANGE) {
	currDirLen += 50;
	currDir = xrealloc(currDir, currDirLen);
    }

    return currDir;
}

/* glob_pattern_p() taken from bash
 * Copyright (C) 1985, 1988, 1989 Free Software Foundation, Inc.
 *
 * Return nonzero if PATTERN has any special globbing chars in it.
 */
int myGlobPatternP (const char *patternURL)
{
    const char *p;
    char c;
    int open = 0;
  
    (void) urlPath(patternURL, &p);
    while ((c = *p++) != '\0')
	switch (c) {
	case '?':
	case '*':
	    return (1);
	case '[':      /* Only accept an open brace if there is a close */
	    open++;    /* brace to match it.  Bracket expressions must be */
	    continue;  /* complete, according to Posix.2 */
	case ']':
	    if (open)
		return (1);
	    continue;      
	case '\\':
	    if (*p++ == '\0')
		return (0);
	}

    return (0);
}

static int glob_error(/*@unused@*/const char *foo, /*@unused@*/int bar)
{
    return 1;
}

int rpmGlob(const char * patterns, int * argcPtr, const char *** argvPtr)
{
    int ac = 0;
    const char ** av = NULL;
    int argc = 0;
    const char ** argv = NULL;
    const char * path;
    const char * globURL;
    char * globRoot = NULL;
    size_t maxb, nb;
    glob_t gl;
    int ut;
    int i, j;
    int rc;

    rc = poptParseArgvString(patterns, &ac, &av);
    if (rc)
	return rc;

    for (j = 0; j < ac; j++) {
	if (!myGlobPatternP(av[j])) {
	    if (argc == 0)
		argv = xmalloc((argc+2) * sizeof(*argv));
	    else
		argv = xrealloc(argv, (argc+2) * sizeof(*argv));
	    argv[argc] = xstrdup(av[j]);
if (_debug)
fprintf(stderr, "*** rpmGlob argv[%d] \"%s\"\n", argc, argv[argc]);
	    argc++;
	    continue;
	}
	
	gl.gl_pathc = 0;
	gl.gl_pathv = NULL;
	rc = Glob(av[j], 0, glob_error, &gl);
	if (rc)
	    goto exit;

	/* XXX Prepend the URL leader for globs that have stripped it off */
	maxb = 0;
	for (i = 0; i < gl.gl_pathc; i++) {
	    if ((nb = strlen(&(gl.gl_pathv[i][0]))) > maxb)
		maxb = nb;
	}
	
	ut = urlPath(av[j], &path);
	nb = ((ut > URL_IS_DASH) ? (path - av[j]) : 0);
	maxb += nb;
	maxb += 1;
	globURL = globRoot = xmalloc(maxb);

	switch (ut) {
	case URL_IS_HTTP:
	case URL_IS_FTP:
	case URL_IS_PATH:
	case URL_IS_DASH:
	    strncpy(globRoot, av[j], nb);
	    /*@switchbreak@*/ break;
	case URL_IS_UNKNOWN:
	    /*@switchbreak@*/ break;
	}
	globRoot += nb;
	*globRoot = '\0';
if (_debug)
fprintf(stderr, "*** GLOB maxb %d diskURL %d %*s globURL %p %s\n", (int)maxb, (int)nb, (int)nb, av[j], globURL, globURL);
	
	/*@-branchstate@*/
	if (argc == 0)
	    argv = xmalloc((gl.gl_pathc+1) * sizeof(*argv));
	else if (gl.gl_pathc > 0)
	    argv = xrealloc(argv, (argc+gl.gl_pathc+1) * sizeof(*argv));
	/*@=branchstate@*/
	for (i = 0; i < gl.gl_pathc; i++) {
	    const char * globFile = &(gl.gl_pathv[i][0]);
	    if (globRoot > globURL && globRoot[-1] == '/')
		while (*globFile == '/') globFile++;
	    strcpy(globRoot, globFile);
if (_debug)
fprintf(stderr, "*** rpmGlob argv[%d] \"%s\"\n", argc, globURL);
	    argv[argc++] = xstrdup(globURL);
	}
	/*@-immediatetrans@*/
	Globfree(&gl);
	/*@=immediatetrans@*/
	globURL = _free(globURL);
    }
    if (argv != NULL && argc > 0) {
	argv[argc] = NULL;
	if (argvPtr)
	    *argvPtr = argv;
	if (argcPtr)
	    *argcPtr = argc;
	rc = 0;
    } else
	rc = 1;


exit:
    av = _free(av);
    if (rc || argvPtr == NULL) {
	if (argv != NULL)
	for (i = 0; i < argc; i++)
	    argv[i] = _free(argv[i]);
	argv = _free(argv);
    }
    return rc;
}

/*
 * XXX This is a "dressed" entry to headerGetEntry to do:
 *      1) DIRNAME/BASENAME/DIRINDICES -> FILENAMES tag conversions.
 *      2) i18n lookaside (if enabled).
 */
int rpmHeaderGetEntry(Header h, int_32 tag, int_32 *type,
	void **p, int_32 *c)
{
    switch (tag) {
    case RPMTAG_OLDFILENAMES:
    {	const char ** fl = NULL;
	int count;
	rpmBuildFileList(h, &fl, &count);
	if (count > 0) {
	    *p = fl;
	    if (c)	*c = count;
	    if (type)	*type = RPM_STRING_ARRAY_TYPE;
	    return 1;
	}
	if (c)	*c = 0;
	return 0;
    }	/*@notreached@*/ break;

    case RPMTAG_GROUP:
    case RPMTAG_DESCRIPTION:
    case RPMTAG_SUMMARY:
    {	char fmt[128];
	const char * msgstr;
	const char * errstr;

	fmt[0] = '\0';
	(void) stpcpy( stpcpy( stpcpy( fmt, "%{"), tagName(tag)), "}\n");

	/* XXX FIXME: memory leak. */
        msgstr = headerSprintf(h, fmt, rpmTagTable, rpmHeaderFormats, &errstr);
	if (msgstr) {
	    *p = (void *) msgstr;
	    if (type)	*type = RPM_STRING_TYPE;
	    if (c)	*c = 1;
	    return 1;
	} else {
	    if (c)	*c = 0;
	    return 0;
	}
    }	/*@notreached@*/ break;

    default:
	return headerGetEntry(h, tag, type, p, c);
	/*@notreached@*/ break;
    }
    /*@notreached@*/
}