src/scrontab/env.c

/*****************************************************************************\
 *  parse.c
 *****************************************************************************
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 *
 *  This file is part of Slurm, a resource management program.
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#include <ctype.h>

#include "src/common/xstring.h"

/*
 * Attempt to parse a line assuming it's an "environment setting".
 * Work off the syntax as outlined in crontab(5).
 * Return true if this parsed successfully, false if it did not.
 */
extern bool load_env(char *line, char **key, char **value)
{
	int key_start = 0, key_end, equal, value_start, value_end;

	/* skip leading whitespace */
	while (line[key_start] && isblank((int) line[key_start])) {
		if (!line[key_start + 1])
			return false;
		key_start++;
	}

	/* read characters until next whitespace or = */
	key_end = key_start;
	while (line[key_end] &&
	       (isalnum((int) line[key_end]) || line[key_end] == '_')) {
		if (!line[key_end + 1])
			return false;
		if (line[key_end] == '=')
			break;
		key_end++;
	}

	/* skip more whitespace until we find = */
	equal = key_end;
	while (line[equal] && isblank((int) line[equal])) {
		if (!line[equal + 1])
			return false;
		equal++;
	}

	if (line[equal] != '=')
		return false;

	/* skip whitespace after = */
	value_start = equal + 1;
	while (line[value_start] && isblank((int) line[value_start])) {
		if (!line[value_start + 1])
			return false;
		value_start++;
	}

	/* if quote mark, everything until the next quote mark is the value */
	if (line[value_start] == '\'' || line[value_start] == '"') {
		int quote = value_start, end;

		value_start++;

		/* ensure trailing quote is found */
		value_end = value_start;
		while (line[value_end]) {
			if (line[value_end] == line[quote])
				break;
			value_end++;
		}

		end = value_end;
		if (!line[end] || (line[end] != line[quote])) {
			error("not match");
			return false;
		}
		end++;

		/* anything after the matched quote needs to be whitespace */
		while (line[end]) {
			if (!isblank((int) line[end]))
				return false;
			end++;
		}
	} else {
		value_end = value_start;
		while (line[value_end])
			value_end++;
	}

	*key = xstrndup(line + key_start, key_end - key_start);
	*value = xstrndup(line + value_start, value_end - value_start);

	return true;
}