/* util2.c
 */
/* This software is copyrighted as detailed in the LICENSE file. */


#include "EXTERN.h"
#include "common.h"
#include "list.h"
#include "hash.h"
#include "ngdata.h"
#include "nntpclient.h"
#include "datasrc.h"
#include "nntp.h"
#include "nntpauth.h"
#include "util.h"
#include "util3.h"
#include "INTERN.h"
#include "util2.h"

#ifdef TILDENAME
static char* tildename = NULL;
static char* tildedir = NULL;
#endif

/* copy a string to a safe spot */

char*
savestr(str)
char* str;
{
    register char* newaddr = safemalloc((MEM_SIZE)(strlen(str)+1));

    strcpy(newaddr,str);
    return newaddr;
}

/* safe version of string copy */

char*
safecpy(to,from,len)
char* to;
register char* from;
register int len;
{
    register char* dest = to;

    if (from) {
	while (--len && *from)
	    *dest++ = *from++;
    }
    *dest = '\0';

    return to;
}

/* copy a string up to some (non-backslashed) delimiter, if any */

char*
cpytill(to,from,delim)
register char* to;
register char* from;
register int delim;
{
    while (*from) {
	if (*from == '\\' && from[1] == delim)
	    from++;
	else if (*from == delim)
	    break;
	*to++ = *from++;
    }
    *to = '\0';
    return from;
}

/* expand filename via %, ~, and $ interpretation */
/* returns pointer to static area */
/* Note that there is a 1-deep cache of ~name interpretation */

char*
filexp(s)
register char* s;
{
    static char filename[CBUFLEN];
    char scrbuf[CBUFLEN];
    register char* d;

#ifdef DEBUG
    if (debug & DEB_FILEXP)
	printf("< %s\n",s) FLUSH;
#endif
    /* interpret any % escapes */
    dointerp(filename,sizeof filename,s,(char*)NULL,(char*)NULL);
#ifdef DEBUG
    if (debug & DEB_FILEXP)
	printf("%% %s\n",filename) FLUSH;
#endif
    s = filename;
    if (*s == '~') {	/* does destination start with ~? */
	if (!*(++s) || *s == '/') {
	    sprintf(scrbuf,"%s%s",homedir,s);
				/* swap $HOME for it */
#ifdef DEBUG
	    if (debug & DEB_FILEXP)
		printf("~ %s\n",scrbuf) FLUSH;
#endif
	    strcpy(filename,scrbuf);
	}
	else if (*s == '~' && (!s[1] || s[1] == '/')) {
	    d = getenv("TRNPREFIX");
	    if (!d)
		d = INSTALLPREFIX;
	    sprintf(scrbuf,"%s%s",d,s+1);
#ifdef DEBUG
	    if (debug & DEB_FILEXP)
		printf("~~ %s\n",scrbuf) FLUSH;
#endif
	}
	else {
#ifdef TILDENAME
	    for (d = scrbuf; isalnum(*s); s++, d++) *d = *s;
	    *d = '\0';
	    if (tildedir && strEQ(tildename,scrbuf)) {
		strcpy(scrbuf,tildedir);
		strcat(scrbuf, s);
		strcpy(filename, scrbuf);
#ifdef DEBUG
		if (debug & DEB_FILEXP)
		    printf("r %s %s\n",tildename,tildedir) FLUSH;
#endif
	    }
	    else {
		if (tildename)
		    free(tildename);
		if (tildedir)
		    free(tildedir);
		tildedir = NULL;
		tildename = savestr(scrbuf);
#ifdef HAS_GETPWENT	/* getpwnam() is not the paragon of efficiency */
		{
		    struct passwd* pwd = getpwnam(tildename);
		    if (pwd == NULL) {
			printf("%s is an unknown user. Using default.\n",tildename) FLUSH;
			return NULL;
		    }
		    sprintf(scrbuf,"%s%s",pwd->pw_dir,s);
		    tildedir = savestr(pwd->pw_dir);
		    strcpy(filename,scrbuf);
		    endpwent();
		}
#else			/* this will run faster, and is less D space */
		{	/* just be sure LOGDIRFIELD is correct */
		    FILE* pfp = fopen(filexp(PASSFILE),"r");
		    char tmpbuf[512];
		    int i;

		    if (pfp) {
			while (fgets(tmpbuf,512,pfp) != NULL) {
			    d = cpytill(scrbuf,tmpbuf,':');
#ifdef DEBUG
			    if (debug & DEB_FILEXP)
				printf("p %s\n",tmpbuf) FLUSH;
#endif
			    if (strEQ(scrbuf,tildename)) {
				for (i=LOGDIRFIELD-2; i; i--) {
				    if (d)
					d = index(d+1,':');
				}
				if (d) {
				    cpytill(scrbuf,d+1,':');
				    tildedir = savestr(scrbuf);
				    strcat(scrbuf,s);
				    strcpy(filename,scrbuf);
				}
				break;
			    }
			}
			fclose(pfp);
		    }
		    if (!tildedir) {
			printf("%s is an unknown user. Using default.\n",tildename) FLUSH;
			return NULL;
		    }
		}
#endif
	    }
#else /* !TILDENAME */
#ifdef VERBOSE
	    IF(verbose)
		fputs("~loginname not implemented.\n",stdout) FLUSH;
	    ELSE
#endif
#ifdef TERSE
		fputs("~login not impl.\n",stdout) FLUSH;
#endif
#endif
	}
    }
    else if (*s == '$') {	/* starts with some env variable? */
	d = scrbuf;
	*d++ = '%';
	if (s[1] == '{')
	    strcpy(d,s+2);
	else {
	    *d++ = '{';
	    for (s++; isalnum(*s); s++) *d++ = *s;
				/* skip over token */
	    *d++ = '}';
	    strcpy(d,s);
	}
#ifdef DEBUG
	if (debug & DEB_FILEXP)
	    printf("$ %s\n",scrbuf) FLUSH;
#endif
	/* this might do some extra '%'s, but that's how the Mercedes Benz */
	dointerp(filename,sizeof filename,scrbuf,(char*)NULL,(char*)NULL);
    }
#ifdef DEBUG
    if (debug & DEB_FILEXP)
	printf("> %s\n",filename) FLUSH;
#endif
    return filename;
}

/* return ptr to little string in big string, NULL if not found */

char*
instr(big, little, case_matters)
char* big;
char* little;
bool_int case_matters;
{
    register char* t;
    register char* s;
    register char* x;

    for (t = big; *t; t++) {
	for (x=t,s=little; *s; x++,s++) {
	    if (!*x)
		return NULL;
	    if (case_matters == TRUE) {
		if (*s != *x)
		    break;
	    } else {
		register char c,d;
		if (isupper(*s)) 
		    c = tolower(*s);
		else
		    c = *s;
		if (isupper(*x)) 
		    d = tolower(*x);
		else
		    d = *x;
		if ( c != d )
		    break;
	   }
	}
	if (!*s)
	    return t;
    }
    return NULL;
}

#ifndef HAS_STRCASECMP
static Uchar casemap[256] = {
    0x00,0x01,0x02,0x03,0x04,0x05,0x06,0x07,
    0x08,0x09,0x0A,0x0B,0x0C,0x0D,0x0E,0x0F,
    0x10,0x11,0x12,0x13,0x14,0x15,0x16,0x17,
    0x18,0x19,0x1A,0x1B,0x1C,0x1D,0x1E,0x1F,
    0x20,0x21,0x22,0x23,0x24,0x25,0x26,0x27,
    0x28,0x29,0x2A,0x2B,0x2C,0x2D,0x2E,0x2F,
    0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,
    0x38,0x39,0x3A,0x3B,0x3C,0x3D,0x3E,0x3F,
    0x40,0x61,0x62,0x63,0x64,0x65,0x66,0x67,
    0x68,0x69,0x6A,0x6B,0x6C,0x6D,0x6E,0x6F,
    0x70,0x71,0x72,0x73,0x74,0x75,0x76,0x77,
    0x78,0x79,0x7A,0x7B,0x5C,0x5D,0x5E,0x5F,
    0x60,0x61,0x62,0x63,0x64,0x65,0x66,0x67,
    0x68,0x69,0x6A,0x6B,0x6C,0x6D,0x6E,0x6F,
    0x70,0x71,0x72,0x73,0x74,0x75,0x76,0x77,
    0x78,0x79,0x7A,0x7B,0x7C,0x7D,0x7E,0x7F,
    0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,
    0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F,
    0x90,0x91,0x92,0x93,0x94,0x95,0x96,0x97,
    0x98,0x99,0x9A,0x9B,0x9C,0x9D,0x9E,0x9F,
    0xA0,0xA1,0xA2,0xA3,0xA4,0xA5,0xA6,0xA7,
    0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF,
    0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,
    0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF,
    0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,
    0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF,
    0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,
    0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF,
    0xE0,0xE1,0xE2,0xE3,0xE4,0xE5,0xE6,0xE7,
    0xE8,0xE9,0xEA,0xEB,0xEC,0xED,0xEE,0xEF,
    0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,
    0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF
};
#endif

#ifndef HAS_STRCASECMP
int
trn_casecmp(s1, s2)
register char* s1;
register char* s2;
{
    do {
	if (casemap[(Uchar)*s1++] != casemap[(Uchar)*s2])
	    return casemap[(Uchar)s1[-1]] - casemap[(Uchar)*s2];
    } while (*s2++ != '\0');
    return 0;
}
#endif

#ifndef HAS_STRCASECMP
int
trn_ncasecmp(s1, s2, len)
register char* s1;
register char* s2;
register int len;
{
    while (len--) {
	if (casemap[(Uchar)*s1++] != casemap[(Uchar)*s2])
	    return casemap[(Uchar)s1[-1]] - casemap[(Uchar)*s2];
	if (*s2++ == '\0')
	    break;
    }
    return 0;
}
#endif

#ifdef SUPPORT_NNTP
char*
read_auth_file(file, pass_ptr)
char* file;
char** pass_ptr;
{
    FILE* fp;
    char* strptr[2];
    char buf[1024];
    strptr[0] = strptr[1] = NULL;
    if ((fp = fopen(file,"r")) != NULL) {
	int i;
	for (i = 0; i < 2; i++) {
	    if (fgets(buf, sizeof buf, fp) != NULL) {
		char* cp = buf + strlen(buf) - 1;
		if (*cp == '\n')
		    *cp = '\0';
		strptr[i] = savestr(buf);
	    }
	}
	fclose(fp);
    }
    *pass_ptr = strptr[1];
    return strptr[0];
}
#endif

#ifdef MSDOS
int
ChDir(path)
char* path;
{
    if (isalpha(*path) && path[1] == ':') {
	setdisk(path[0]&0x1f);
	path += 2;
    }
#undef chdir
    return chdir(path);
} 
#endif

#ifdef MSDOS
int
getuid()
{
    return 2;
}
#endif