133 lines
4.2 KiB
C
133 lines
4.2 KiB
C
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/* flex - tool to generate fast lexical analyzers */
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/* Copyright (c) 1990 The Regents of the University of California. */
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/* All rights reserved. */
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/* This code is derived from software contributed to Berkeley by */
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/* Vern Paxson. */
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/* The United States Government has rights in this work pursuant */
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/* to contract no. DE-AC03-76SF00098 between the United States */
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/* Department of Energy and the University of California. */
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/* This file is part of flex. */
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/* Redistribution and use in source and binary forms, with or without */
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/* modification, are permitted provided that the following conditions */
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/* are met: */
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/* 1. Redistributions of source code must retain the above copyright */
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/* notice, this list of conditions and the following disclaimer. */
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/* 2. Redistributions in binary form must reproduce the above copyright */
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/* notice, this list of conditions and the following disclaimer in the */
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/* documentation and/or other materials provided with the distribution. */
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/* Neither the name of the University nor the names of its contributors */
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/* may be used to endorse or promote products derived from this software */
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/* without specific prior written permission. */
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/* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR */
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/* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED */
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/* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR */
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/* PURPOSE. */
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#ifndef SCANOPT_H
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#define SCANOPT_H
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#include "flexdef.h"
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#ifndef NO_SCANOPT_USAGE
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/* Used by scanopt_usage for pretty-printing. */
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#ifdef HAVE_NCURSES_H
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#include <ncurses.h>
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#endif
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#endif
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#ifdef __cplusplus
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extern "C" {
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#endif
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#ifndef PROTO
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#define PROTO(args) args
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#endif
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/* Error codes. */ enum scanopt_err_t {
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SCANOPT_ERR_OPT_UNRECOGNIZED = -1, /* Unrecognized option. */
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SCANOPT_ERR_OPT_AMBIGUOUS = -2, /* It matched more than one option name. */
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SCANOPT_ERR_ARG_NOT_FOUND = -3, /* The required arg was not found. */
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SCANOPT_ERR_ARG_NOT_ALLOWED = -4 /* Option does not take an argument. */
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};
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/* flags passed to scanopt_init */
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enum scanopt_flag_t {
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SCANOPT_NO_ERR_MSG = 0x01 /* Suppress printing to stderr. */
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};
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/* Specification for a single option. */
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struct optspec_t {
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const char *opt_fmt; /* e.g., "--foo=FILE", "-f FILE", "-n [NUM]" */
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int r_val; /* Value to be returned by scanopt_ex(). */
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const char *desc; /* Brief description of this option, or NULL. */
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};
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typedef struct optspec_t optspec_t;
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/* Used internally by scanopt() to maintain state. */
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/* Never modify these value directly. */
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typedef void *scanopt_t;
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/* Initializes scanner and checks option list for errors.
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* Parameters:
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* options - Array of options.
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* argc - Same as passed to main().
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* argv - Same as passed to main(). First element is skipped.
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* flags - Control behavior.
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* Return: A malloc'd pointer .
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*/
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scanopt_t *scanopt_init PROTO ((const optspec_t * options,
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int argc, char **argv, int flags));
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/* Frees memory used by scanner.
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* Always returns 0. */
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int scanopt_destroy PROTO ((scanopt_t * scanner));
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#ifndef NO_SCANOPT_USAGE
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/* Prints a usage message based on contents of optlist.
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* Parameters:
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* scanner - The scanner, already initialized with scanopt_init().
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* fp - The file stream to write to.
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* usage - Text to be prepended to option list. May be NULL.
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* Return: Always returns 0 (zero).
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*/
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int scanopt_usage
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PROTO (
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(scanopt_t * scanner, FILE * fp,
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const char *usage));
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#endif
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/* Scans command-line options in argv[].
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* Parameters:
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* scanner - The scanner, already initialized with scanopt_init().
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* optarg - Return argument, may be NULL.
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* On success, it points to start of an argument.
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* optindex - Return argument, may be NULL.
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* On success or failure, it is the index of this option.
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* If return is zero, then optindex is the NEXT valid option index.
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*
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* Return: > 0 on success. Return value is from optspec_t->rval.
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* == 0 if at end of options.
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* < 0 on error (return value is an error code).
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*
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*/
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int scanopt
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PROTO (
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(scanopt_t * scanner, char **optarg,
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int *optindex));
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#ifdef __cplusplus
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}
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#endif
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#endif
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/* vim:set tabstop=8 softtabstop=4 shiftwidth=4: */
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