133 lines
3.3 KiB
C
133 lines
3.3 KiB
C
/*
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* Copyright (c) 2017 Jonas 'Sortie' Termansen.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* autoconf.c
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* Parser for autoinstall.conf(5) and autoupgrade.conf(5).
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*/
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#include <ctype.h>
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#include <err.h>
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#include <errno.h>
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#include <stdbool.h>
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#include <stddef.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "autoconf.h"
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// TODO: This file is very unfinished draft stuff.
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bool has_autoconf = false;
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const char* autoconf_get(const char* name)
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{
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if ( !name || !has_autoconf )
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return NULL;
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return getenv(name);
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}
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void autoconf_load(const char* path)
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{
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FILE* fp = fopen(path, "r");
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if ( !fp )
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{
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if ( errno != ENOENT )
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warn("%s", path);
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return;
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}
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char* line = NULL;
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size_t line_size = 0;
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ssize_t line_length;
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while ( 0 < (line_length = getline(&line, &line_size, fp)) )
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{
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if ( line[line_length - 1] == '\n' )
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line[--line_length] = '\0';
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line_length = 0;
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while ( line[line_length] && line[line_length] != '#' )
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line_length++;
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line[line_length] = '\0';
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char* name = line;
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if ( !*name || *name == '=' )
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continue;
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size_t name_length = 1;
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while ( name[name_length] &&
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name[name_length] != '=' &&
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name[name_length] != '+' )
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name_length++;
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if ( name[name_length + 0] == '+' &&
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name[name_length + 1] == '+' &&
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name[name_length + 2] == '=' )
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{
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name[name_length + 0] = '\0';
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char* value = name + name_length + 3;
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const char* existing = getenv(name);
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if ( existing )
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{
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char* full;
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if ( asprintf(&full, "%s\n%s", existing, value) < 0 )
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err(2, "%s: asprintf", path);
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setenv(name, full, 1);
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free(full);
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}
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else
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setenv(name, value, 1);
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}
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else if ( name[name_length + 0] == '+' &&
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name[name_length + 1] == '=' )
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{
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name[name_length + 0] = '\0';
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char* value = name + name_length + 2;
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const char* existing = getenv(name);
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if ( existing )
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{
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char* full;
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if ( asprintf(&full, "%s %s", existing, value) < 0 )
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err(2, "%s: asprintf", path);
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setenv(name, full, 1);
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free(full);
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}
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else
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setenv(name, value, 1);
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}
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else if ( name[name_length + 0] == '=' )
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{
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name[name_length + 0] = '\0';
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char* value = name + name_length + 1;
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setenv(name, value, 1);
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}
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else
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{
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// TODO: Graceful.
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errx(2, "%s: Bad line: %s", path, line);
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}
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char* value = name + name_length;
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while ( *value && isblank((unsigned char) *value) )
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value++;
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if ( *value != '=' )
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continue;
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value++;
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while ( *value && isblank((unsigned char) *value) )
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value++;
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name[name_length] = '\0';
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}
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// TODO: Graceful error.
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if ( ferror(fp) )
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err(2, "%s", path);
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free(line);
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fclose(fp);
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has_autoconf = true;
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}
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