| 0,0 → 1,36 |
|---|
| /* |
| * routines used to manipulate the environment block |
| * Copyright (C) 2021, Mateusz Viste |
| */ |
| |
| #ifndef ENV_H |
| #define ENV_H |
| |
| /* looks for varname in environment block and returns a far ptr to it if |
| * found, NULL otherwise. varname MUST be in upper-case and MUST be terminated |
| * by either a = sign or a NULL terminator */ |
| char far *env_lookup(unsigned short env_seg, const char *varname); |
| |
| /* returns the size, in bytes, of the allocated environment block */ |
| unsigned short env_allocsz(unsigned short env_seg); |
| |
| /* remove a variable from environment, if present. returns 0 on success, non-zero if variable not found */ |
| int env_dropvar(unsigned short env_seg, const char *varname); |
| |
| #define ENV_SUCCESS 0 |
| #define ENV_NOTENOM -1 |
| #define ENV_INVSYNT -2 |
| |
| /* Writes a variable to environment block. The variable must in the form |
| * "varname=value". If variable is already present in the environment block, |
| * then the value will be updated. If the new value is empty, then the |
| * existing variable (if any) is removed. |
| * |
| * This function returns: |
| * ENV_SUCCESS = success |
| * ENV_NOTENOM = not enough available space in memory block |
| * ENV_INVSYNT = invalid syntax |
| */ |
| int env_setvar(unsigned short env_seg, const char *v); |
| |
| #endif |