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/*
casm - Simple, portable assembler
Copyright (C) 2003-2015 Ian Cowburn (ianc@noddybox.co.uk)
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
-------------------------------------------------------------------------
Command callback definitions
*/
#ifndef CASM_CMD_H
#define CASM_CMD_H
/* ---------------------------------------- TYPES
*/
typedef enum
{
CMD_OK,
CMD_OK_WARNING,
CMD_FAILED,
CMD_NOT_KNOWN
} CommandStatus;
/* Used to implement a command.
*/
typedef CommandStatus (*Command)(const char *label, int argc, char *argv[],
int quoted[], char *err, size_t errsize);
/* ---------------------------------------- HELPER MACROS
*/
/* Check for the precesence of a label. Expects a variable called 'label'
Args:
NONE
Expects:
argv - The argv passed to the command handler
label - The label passed to the command handler
err - The error location passed to the command handler
errsize - The size of the error location passed to the command handler
*/
#define CMD_LABEL_CHECK \
do \
{ \
if (!label) \
{ \
snprintf(err, errsize, "%s: missing label", argv[0]); \
return CMD_FAILED; \
} \
} while(0)
/* Check for the arg count being at least a specified number.
Args:
min - The minimum number of arguments to support
Expects:
argc - The argc passed to the command handler
argv - The argv passed to the command handler
err - The error location passed to the command handler
errsize - The size of the error location passed to the command handler
*/
#define CMD_ARGC_CHECK(min) \
do \
{ \
if (argc < min) \
{ \
snprintf(err, errsize, "%s: missing argument", argv[0]); \
return CMD_FAILED; \
} \
} while(0)
/* Evaluate an expression.
Args:
expr - The expression to evaluate
result - The variable to hold the result
Expects:
argc - The argc passed to the command handler
argv - The argv passed to the command handler
err - The error location passed to the command handler
errsize - The size of the error location passed to the command handler
*/
#define CMD_EXPR(expr, result) \
do \
{ \
if (!ExprEval(expr, &result)) \
{ \
snprintf(err, errsize, "%s: expression error: %s", \
argv[0], ExprError()); \
return CMD_FAILED; \
} \
} while(0)
/* Parse a table using ParseTable()
Args:
str - The string to look for
table - The table to parse
result - Variable to hold the return from ParseTable()
Expects:
argv - The argv passed to the command handler
err - The error location passed to the command handler
errsize - The size of the error location passed to the command handler
*/
#define CMD_TABLE(str, table, result) \
do \
{ \
if (!(result = ParseTable(str, table))) \
{ \
snprintf(err, errsize, "unknown value: \"%s\"", str); \
return CMD_FAILED; \
} \
} while(0)
#endif
/*
vim: ai sw=4 ts=8 expandtab
*/
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