| /svarcom/cmd/cd.c |
|---|
| 0,0 → 1,99 |
| /* |
| * chdir |
| * |
| * displays the name of or changes the current directory. |
| * |
| * CHDIR [drive:][path] |
| * CD.. |
| * |
| * Type CD drive: to display the current directory in the specified drive. |
| * Type CD without parameters to display the current drive and directory. |
| */ |
| static int cmd_cd(const struct cmd_funcparam *p) { |
| /* two arguments max */ |
| if (p->argc > 1) { |
| puts("Too many parameters"); |
| } |
| /* no argument? display current drive and dir ("CWD") */ |
| if (p->argc == 0) { |
| char buff[64]; |
| char *buffptr = buff; |
| _asm { |
| push ax |
| push dx |
| push si |
| mov ah, 0x19 /* get current default drive */ |
| int 0x21 /* al = drive (00h = A:, 01h = B:, etc) */ |
| add al, 'A' |
| /* print drive to stdout */ |
| mov dl, al |
| mov ah, 0x02 |
| int 0x21 |
| mov dl, ':' |
| int 0x21 |
| mov dl, '\' |
| int 0x21 |
| /* get current dir */ |
| mov ah, 0x47 |
| xor dl, dl /* select drive (0 = current drive) */ |
| mov si, buffptr /* 64-byte buffer for ASCIZ pathname */ |
| int 0x21 |
| pop si |
| pop dx |
| pop ax |
| } |
| puts(buff); |
| } |
| /* argument can be either a drive (D:) or a path */ |
| if (p->argc == 1) { |
| const char *arg = p->argv[0]; |
| unsigned short err = 0; |
| /* drive (CD B:) */ |
| if ((arg[0] != '\\') && (arg[1] == ':') && (arg[2] == 0)) { |
| char buff[64]; |
| char *buffptr = buff; |
| unsigned char drive = arg[0]; |
| if (drive >= 'a') { |
| drive -= 'a'; |
| } else { |
| drive -= 'A'; |
| } |
| drive++; /* A: = 1, B: = 2, etc*/ |
| _asm { |
| push si |
| push ax |
| push dx |
| mov ah, 0x47 /* get current directory */ |
| mov dl, [drive] /* A: = 1, B: = 2, etc */ |
| mov si, buffptr |
| int 0x21 |
| jnc DONE |
| mov [err], ax |
| DONE: |
| pop dx |
| pop ax |
| pop si |
| } |
| if (err == 0) printf("%c:\\%s\r\n", drive + 'A' - 1, buff); |
| } else { /* path */ |
| _asm { |
| push dx |
| push ax |
| mov ah, 0x3B /* CHDIR (set current directory) */ |
| mov dx, arg |
| int 0x21 |
| jnc DONE |
| mov [err], ax |
| DONE: |
| pop ax |
| pop dx |
| } |
| } |
| if (err != 0) puts(doserr(err)); |
| } |
| return(-1); |
| } |
| /svarcom/cmd/exit.c |
|---|
| 0,0 → 1,18 |
| /* |
| * exit |
| * |
| * Quits the COMMAND.COM program (command interpreter) |
| * |
| */ |
| static int cmd_exit(const struct cmd_funcparam *p) { |
| if ((p->argc == 1) && (imatch(p->argv[0], "/?"))) { |
| puts("EXIT"); |
| puts(""); |
| puts("Quits the COMMAND.COM program (command interpreter)"); |
| puts(""); |
| } else { |
| exit(0); |
| } |
| return(-1); |
| } |
| /svarcom/cmd/set.c |
|---|
| 0,0 → 1,64 |
| /* |
| * set [varname[=value]] |
| * |
| * value cannot contain any '=' character, but it can contain spaces |
| * varname can also contain spaces |
| */ |
| #include "env.h" |
| static int cmd_set(const struct cmd_funcparam *p) { |
| char far *env = MK_FP(p->env_seg, 0); |
| char buff[256]; |
| int i; |
| /* no arguments - display content */ |
| if (p->argc == 0) { |
| while (*env != 0) { |
| /* copy string to local buff for display */ |
| for (i = 0;; i++) { |
| buff[i] = *env; |
| env++; |
| if (buff[i] == 0) break; |
| } |
| puts(buff); |
| } |
| } else if ((p->argc == 1) && (imatch(p->argv[0], "/?"))) { |
| puts("TODO: help screen"); /* TODO */ |
| } else { /* set variable (do not rely on argv, SET has its own rules...) */ |
| const char far *ptr; |
| char buff[256]; |
| unsigned short i; |
| /* locate the first space */ |
| for (ptr = p->cmdline; *ptr != ' '; ptr++); |
| /* now locate the first non-space: that's where the variable name begins */ |
| for (; *ptr == ' '; ptr++); |
| /* copy variable to buff and switch it upercase */ |
| i = 0; |
| for (; *ptr != '='; ptr++) { |
| if (*ptr == '\r') goto syntax_err; |
| buff[i] = *ptr; |
| if ((buff[i] >= 'a') && (buff[i] <= 'z')) buff[i] -= ('a' - 'A'); |
| i++; |
| } |
| /* copy value now */ |
| while (*ptr != '\r') { |
| buff[i++] = *ptr; |
| ptr++; |
| } |
| /* terminate buff */ |
| buff[i] = 0; |
| /* commit variable to environment */ |
| i = env_setvar(p->env_seg, buff); |
| if (i == ENV_INVSYNT) goto syntax_err; |
| if (i == ENV_NOTENOM) puts("Not enough available space within the environment block"); |
| } |
| return(-1); |
| syntax_err: |
| puts("Syntax error"); |
| return(-1); |
| } |