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/* This file is part of the SvarCOM project and is published under the terms
* of the MIT license.
*
* Copyright (C) 2021-2022 Mateusz Viste
*
* 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
* AUTHORS OR COPYRIGHT HOLDERS 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.
*/
/*
* ln add linkname linkdir
* ln del linkname
* ln list [pattern]
*/
static enum cmd_result cmd_lnadd(char *BUFFER, const char *linkname, const char *targetdir, unsigned short env_seg) {
const char *ext;
char *realdirname = BUFFER;
unsigned short realdirnamelen;
char *buff = BUFFER + 256;
unsigned short doserr;
/* convert dirname to realpath */
doserr = file_truename(targetdir, realdirname);
if (doserr != 0) {
nls_outputnl_doserr(doserr);
return(CMD_FAIL);
}
/* does EXENAME in DIRECTORY exist? */
if (lookup_cmd(buff, linkname, realdirname, &ext) != 0) {
nls_outputnl(29,4); /* "No matching executable found in given path." */
return(CMD_FAIL);
}
/* compute the filename of the link file */
if (link_computefname(buff, linkname, env_seg) != 0) return(CMD_FAIL);
realdirnamelen = strlen(realdirname);
/* open file *only if it does not exist yet* and write realdirname to it */
_asm {
push ax
push bx
push cx
push dx
mov ax, 0x6c00 /* extended OPEN */
mov bx, 1 /* open for WRITE */
xor cx, cx /* create the file with no attributes */
mov dx, 0x0010 /* create file if it does not exists, otherwise fail */
mov si, buff /* file name */
int 0x21
jnc WRITE
mov doserr, ax
jmp DONE
WRITE:
mov bx, ax /* file handle */
mov ah, 0x40 /* write to file */
mov cx, realdirnamelen
mov dx, realdirname
int 0x21
mov ah, 0x3e /* close file in BX */
int 0x21
DONE:
pop dx
pop cx
pop bx
pop ax
}
if (doserr != 0) {
nls_outputnl_doserr(doserr);
return(CMD_FAIL);
}
return(CMD_OK);
}
static enum cmd_result cmd_lndel(char *buff, const char *linkname, unsigned short env_seg) {
unsigned short i;
/* is the argument valid? (must not contain any dot nor backslash) */
for (i = 0; linkname[i] != 0; i++) {
if ((linkname[i] == '.') || (linkname[i] == '/') || (linkname[i] == '\\')) {
nls_outputnl(0,3); /* "Invalid parameter format" */
return(CMD_OK);
}
}
/* prep link filename to look at */
if (link_computefname(buff, linkname, env_seg) != 0) return(CMD_FAIL);
/* try removing it */
i = 0;
_asm {
push ax
push bx
push cx
push dx
mov ah, 0x41
mov dx, buff
int 0x21
jnc SUCCESS
mov i, ax
SUCCESS:
pop dx
pop cx
pop bx
pop ax
}
if (i != 0) nls_outputnl_doserr(i);
return(CMD_OK);
}
static enum cmd_result cmd_lnlist(char *buff, const char *linkname, unsigned short env_seg) {
unsigned short i, pathlen;
struct DTA *dta = (void *)0x80;
char *buff128 = buff + 256;
char *buff16 = buff128 + 128;
if (linkname != NULL) {
/* make sure link pattern is valid (must not contain '.' or '\\' or '/') */
for (i = 0; linkname[i] != 0; i++) {
switch (linkname[i]) {
case '.':
case '/':
case '\\':
nls_outputnl(0,3); /* "Invalid parameter format" */
return(CMD_FAIL);
}
}
} else {
linkname = "*";
}
/* prep DOSDIR\LINKS\pattern */
if (link_computefname(buff, linkname, env_seg) != 0) return(CMD_FAIL);
/* set pathlen to end of path (char after last backslash) */
pathlen = 0;
for (i = 0; buff[i] != 0; i++) if (buff[i] == '\\') pathlen = i + 1;
if (findfirst(dta, buff, DOS_ATTR_RO | DOS_ATTR_ARC) != 0) return(CMD_OK);
do {
/* print link file name (but trim ".lnk") */
for (i = 0; (dta->fname[i] != 0) && (dta->fname[i] != '.'); i++) buff16[i] = dta->fname[i];
if (i < 8) buff16[i++] = '\t';
buff16[i] = 0;
output(buff16);
output(" @ ");
/* prep full link filename */
strcpy(buff + pathlen, dta->fname);
/* read up to 128 bytes from link file to buff and display it */
i = 0;
_asm {
push ax
push bx
push cx
push dx
/* open file */
mov ax, 0x3d00
mov dx, buff /* filename */
int 0x21
jc FAIL_FOPEN
/* read from file */
mov bx, ax
mov ah, 0x3f
mov cx, 128
mov dx, buff128
int 0x21
jc FAIL_FREAD
mov i, ax
/* close file */
FAIL_FREAD:
mov ah, 0x3e
int 0x21
FAIL_FOPEN:
pop dx
pop cx
pop bx
pop ax
}
buff128[i] = 0;
/* make sure no cr or lf is present */
for (i = 0; buff128[i] != 0; i++) {
if ((buff128[i] == '\r') || (buff128[i] == '\n')) {
buff128[i] = 0;
break;
}
}
outputnl(buff128);
} while (findnext(dta) == 0);
return(CMD_OK);
}
static enum cmd_result cmd_ln(struct cmd_funcparam *p) {
if (cmd_ishlp(p)) {
nls_outputnl(29,0); /* "Adds, deletes or displays executable links." */
outputnl("");
nls_outputnl(29,1); /* "LN ADD linkname targetdir" */
nls_outputnl(29,2); /* "LN DEL linkname" */
nls_outputnl(29,3); /* "LN LIST [pattern]" */
return(CMD_OK);
}
if (p->argc == 0) {
nls_outputnl(0,7); /* "Required parameter missing */
return(CMD_OK);
}
/* detect what subfunction the user wants */
if ((imatch(p->argv[0], "add")) && (p->argc == 3)) return(cmd_lnadd(p->BUFFER, p->argv[1], p->argv[2], p->env_seg));
if ((imatch(p->argv[0], "del")) && (p->argc == 2)) return(cmd_lndel(p->BUFFER, p->argv[1], p->env_seg));
if (imatch(p->argv[0], "list")) {
if (p->argc == 1) return(cmd_lnlist(p->BUFFER, NULL, p->env_seg));
if (p->argc == 2) return(cmd_lnlist(p->BUFFER, p->argv[1], p->env_seg));
}
nls_outputnl(0,6); /* "Invalid parameter" */
return(CMD_FAIL);
}