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/* This file is part of the SvarCOM project and is published under the terms
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* of the MIT license.
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*
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mateusz.vi |
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* Copyright (C) 2021-2024 Mateusz Viste
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mateuszvis |
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*/
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mateuszvis |
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/*
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* routines used to manipulate the environment block
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*/
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#ifndef ENV_H
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#define ENV_H
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/* looks for varname in environment block and returns a far ptr to it if
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* found, NULL otherwise. varname MUST be in upper-case and MUST be terminated
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* by either a = sign or a NULL terminator */
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char far *env_lookup(unsigned short env_seg, const char *varname);
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/* almost identical to env_lookup(), but instead of returning a pointer
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* to the 'NAME=value' string, it returns a pointer to value (or NULL if
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* var not found) */
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char far *env_lookup_val(unsigned short env_seg, const char *varname);
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/* locates the value of env variable varname and copies it to result, up to
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* ressz bytes (incl. the NULL terminator). returns the length of the value on
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* success, 0 if var not found or couldn't fit in ressz). */
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unsigned short env_lookup_valcopy(char *res, unsigned short ressz, unsigned short env_seg, const char *varname);
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/* returns the size, in bytes, of the allocated environment block */
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unsigned short env_allocsz(unsigned short env_seg);
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/* return currently used space (length, in bytes) of the environment */
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unsigned short env_getcurlen(unsigned short env_seg);
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/* remove a variable from environment, if present. returns 0 on success, non-zero if variable not found */
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int env_dropvar(unsigned short env_seg, const char *varname);
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#define ENV_SUCCESS 0
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#define ENV_NOTENOM -1
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#define ENV_INVSYNT -2
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/* Writes a variable to environment block. The variable must in the form
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* "varname=value". If variable is already present in the environment block,
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* then the value will be updated. If the new value is empty, then the
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* existing variable (if any) is removed.
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*
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* This function returns:
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* ENV_SUCCESS = success
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* ENV_NOTENOM = not enough available space in memory block
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* ENV_INVSYNT = invalid syntax
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*/
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int env_setvar(unsigned short env_seg, const char *v);
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#endif
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