| 1,7 → 1,7 |
|---|
| /* This file is part of the SvarCOM project and is published under the terms |
| * of the MIT license. |
| * |
| * Copyright (C) 2021-2022 Mateusz Viste |
| * Copyright (C) 2021-2024 Mateusz Viste |
| * |
| * Permission is hereby granted, free of charge, to any person obtaining a |
| * copy of this software and associated documentation files (the "Software"), |
| 92,6 → 92,17 |
|---|
| } |
| |
| |
| /* return currently used space (length, in bytes) of the environment */ |
| unsigned short env_getcurlen(unsigned short env_seg) { |
| char far *env = MK_FP(env_seg, 0); |
| unsigned short envlen; |
| for (envlen = 0; env[envlen] != 0; envlen++) { |
| while (env[envlen] != 0) envlen++; /* consume a string */ |
| } |
| return(envlen); |
| } |
| |
| |
| /* 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) { |
| unsigned short blocksz, traillen; |
| 125,7 → 136,6 |
|---|
| */ |
| int env_setvar(unsigned short env_seg, const char *v) { |
| unsigned short envlen; |
| unsigned short envfree; |
| unsigned short vlen, veqpos; |
| char far *env = MK_FP(env_seg, 0); |
| |
| 144,18 → 154,11 |
|---|
| /* if variable empty, stop here */ |
| if (veqpos == vlen - 1) return(ENV_SUCCESS); |
| |
| /* compute current size of the environment */ |
| for (envlen = 0; env[envlen] != 0; envlen++) { |
| while (env[envlen] != 0) envlen++; /* consume a string */ |
| } |
| /* get length of the current environment */ |
| envlen = env_getcurlen(env_seg); |
| |
| /* compute free space available in environment */ |
| envfree = env_allocsz(env_seg); |
| envfree -= envlen; |
| envfree -= 1; /* 1 byte for the environment's NULL terminator */ |
| |
| /* do I have enough env space for the new var? */ |
| if (envfree < vlen + 1) return(ENV_NOTENOM); |
| if (envlen + vlen + 2 >= env_allocsz(env_seg)) return(ENV_NOTENOM); |
| |
| /* write the new variable (with its NULL terminator) to environment tail */ |
| _fmemcpy(env + envlen, v, vlen + 1); |