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Diffstat (limited to 'raslib/shhopt.c')
| -rw-r--r-- | raslib/shhopt.c | 485 |
1 files changed, 485 insertions, 0 deletions
diff --git a/raslib/shhopt.c b/raslib/shhopt.c new file mode 100644 index 0000000..217c096 --- /dev/null +++ b/raslib/shhopt.c @@ -0,0 +1,485 @@ +/* +* This file is part of rasdaman community. +* +* Rasdaman community 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. +* +* Rasdaman community 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 rasdaman community. If not, see <http://www.gnu.org/licenses/>. +* +* Copyright 2003, 2004, 2005, 2006, 2007, 2008, 2009 Peter Baumann / +rasdaman GmbH. +* +* For more information please see <http://www.rasdaman.org> +* or contact Peter Baumann via <baumann@rasdaman.com>. +/ +/* $Id: shhopt.c,v 1.4 2000/09/20 14:41:56 widmann Exp $ */ +/* * + * FILE shhopt.c + * + * DESCRIPTION Functions for parsing command line arguments. Values + * of miscellaneous types may be stored in variables, + * or passed to functions as specified. + * + * REQUIREMENTS Some systems lack the ANSI C -function strtoul. If your + * system is one of those, you'll ned to write one yourself, + * or get the GNU liberty-library (from prep.ai.mit.edu). + * +*/ + +#include <stdio.h> +#include <stdlib.h> +#include <stdarg.h> +#include <string.h> +#include <ctype.h> +#include <limits.h> +#include <errno.h> + +#include "shhopt.h" + +/************************************************************************** + * * + * P R I V A T E D A T A * + * * + **************************************************************************/ + +static void optFatalFunc(const char *, ...); +static void (*optFatal)(const char *format, ...) = optFatalFunc; + + + +/************************************************************************** + * * + * P R I V A T E F U N C T I O N S * + * * + **************************************************************************/ + +/*------------------------------------------------------------------------- + * + * NAME optFatalFunc + * + * FUNCTION Show given message and abort the program. + * + * INPUT format, ... + * Arguments used as with printf(). + * + * RETURNS Never returns. The program is aborted. + * + */ +void optFatalFunc(const char *format, ...) +{ + va_list ap; + + fflush(stdout); + va_start(ap, format); + vfprintf(stderr, format, ap); + va_end(ap); + exit(99); +} + + + +/*------------------------------------------------------------------------- + * + * NAME optStructCount + * + * FUNCTION Get number of options in a optStruct. + * + * INPUT opt array of possible options. + * + * RETURNS Number of options in the given array. + * + * DESCRIPTION Count elements in an optStruct-array. The strcture must + * be ended using an element of type OPT_END. + * + */ +static int optStructCount(optStruct opt[]) +{ + int ret = 0; + + while (opt[ret].type != OPT_END) + ++ret; + return ret; +} + + + +/*------------------------------------------------------------------------- + * + * NAME optMatch + * + * FUNCTION Find a matching option. + * + * INPUT opt array of possible options. + * s string to match, without `-' or `--'. + * lng match long option, otherwise short. + * + * RETURNS Index to the option if found, -1 if not found. + * + * DESCRIPTION Short options are matched from the first character in + * the given string. + * + */ +static int optMatch(optStruct opt[], const char *s, int lng) +{ + int nopt, q, matchlen = 0; + char *p; + + nopt = optStructCount(opt); + if (lng) { + if ((p = (char*)strchr(s, '=')) != NULL) + matchlen = p - s; + else + matchlen = strlen(s); + } + for (q = 0; q < nopt; q++) { + if (lng) { + if (!opt[q].longName) + continue; + if (strncmp(s, opt[q].longName, matchlen) == 0) + return q; + } else { + if (!opt[q].shortName) + continue; + if (*s == opt[q].shortName) + return q; + } + } + return -1; +} + + + +/*------------------------------------------------------------------------- + * + * NAME optString + * + * FUNCTION Return a (static) string with the option name. + * + * INPUT opt the option to stringify. + * lng is it a long option? + * + * RETURNS Pointer to static string. + * + */ +static char *optString(optStruct *opt, int lng) +{ + static char ret[31]; + + if (lng) { + strcpy(ret, "--"); + strncpy(ret + 2, opt->longName, 28); + } else { + ret[0] = '-'; + ret[1] = opt->shortName; + ret[2] = '\0'; + } + return ret; +} + + + +/*------------------------------------------------------------------------- + * + * NAME optNeedsArgument + * + * FUNCTION Check if an option requires an argument. + * + * INPUT opt the option to check. + * + * RETURNS Boolean value. + * + */ +static int optNeedsArgument(optStruct *opt) +{ + return opt->type == OPT_STRING + || opt->type == OPT_INT + || opt->type == OPT_UINT + || opt->type == OPT_LONG + || opt->type == OPT_ULONG; +} + + + +/*------------------------------------------------------------------------- + * + * NAME argvRemove + * + * FUNCTION Remove an entry from an argv-array. + * + * INPUT argc pointer to number of options. + * argv array of option-/argument-strings. + * i index of option to remove. + * + * OUTPUT argc new argument count. + * argv array with given argument removed. + * + */ +static void argvRemove(int *argc, char *argv[], int i) +{ + if (i >= *argc) + return; + while (i++ < *argc) + argv[i - 1] = argv[i]; + --*argc; +} + + + +/*------------------------------------------------------------------------- + * + * NAME optExecute + * + * FUNCTION Perform the action of an option. + * + * INPUT opt array of possible options. + * arg argument to option, if it applies. + * lng was the option given as a long option? + * + * RETURNS Nothing. Aborts in case of error. + * + */ +void optExecute(optStruct *opt, char *arg, int lng) +{ + switch (opt->type) { + case OPT_FLAG: + if (opt->flags & OPT_CALLFUNC) + ((void (*)(void)) opt->arg)(); + else + *((int *) opt->arg) = 1; + break; + + case OPT_STRING: + if (opt->flags & OPT_CALLFUNC) + ((void (*)(char *)) opt->arg)(arg); + else + *((char **) opt->arg) = arg; + break; + + case OPT_INT: + case OPT_LONG: { + long tmp; + char *e; + + tmp = strtol(arg, &e, 10); + if (*e) + optFatal("invalid number `%s'\n", arg); + if (errno == ERANGE + || (opt->type == OPT_INT && (tmp > INT_MAX || tmp < INT_MIN))) + optFatal("number `%s' to `%s' out of range\n", + arg, optString(opt, lng)); + if (opt->type == OPT_INT) { + if (opt->flags & OPT_CALLFUNC) + ((void (*)(int)) opt->arg)((int) tmp); + else + *((int *) opt->arg) = (int) tmp; + } else /* OPT_LONG */ { + if (opt->flags & OPT_CALLFUNC) + ((void (*)(long)) opt->arg)(tmp); + else + *((long *) opt->arg) = tmp; + } + break; + } + + case OPT_UINT: + case OPT_ULONG: { + unsigned long tmp; + char *e; + + tmp = strtoul(arg, &e, 10); + if (*e) + optFatal("invalid number `%s'\n", arg); + if (errno == ERANGE + || (opt->type == OPT_UINT && tmp > UINT_MAX)) + optFatal("number `%s' to `%s' out of range\n", + arg, optString(opt, lng)); + if (opt->type == OPT_UINT) { + if (opt->flags & OPT_CALLFUNC) + ((void (*)(unsigned)) opt->arg)((unsigned) tmp); + else + *((unsigned *) opt->arg) = (unsigned) tmp; + } else /* OPT_ULONG */ { + if (opt->flags & OPT_CALLFUNC) + ((void (*)(unsigned long)) opt->arg)(tmp); + else + *((unsigned long *) opt->arg) = tmp; + } + break; + } + + default: + break; + } +} + + + +/************************************************************************** + * * + * P U B L I C F U N C T I O N S * + * * + **************************************************************************/ + +/*------------------------------------------------------------------------- + * + * NAME optSetFatalFunc + * + * FUNCTION Set function used to display error message and exit. + * + * SYNOPSIS #include "shhmsg.h" + * void optSetFatalFunc(void (*f)(const char *, ...)); + * + * INPUT f function accepting printf()'like parameters, + * that _must_ abort the program. + * + */ +void optSetFatalFunc(void (*f)(const char *, ...)) +{ + optFatal = f; +} + + + +/*------------------------------------------------------------------------- + * + * NAME optParseOptions + * + * FUNCTION Parse commandline options. + * + * SYNOPSIS #include "shhopt.h" + * void optParseOptions(int *argc, char *argv[], + * optStruct opt[], int allowNegNum); + * + * INPUT argc Pointer to number of options. + * argv Array of option-/argument-strings. + * opt Array of possible options. + * allowNegNum + * a negative number is not to be taken as + * an option. + * + * OUTPUT argc new argument count. + * argv array with arguments removed. + * + * RETURNS Nothing. Aborts in case of error. + * + * DESCRIPTION This function checks each option in the argv-array + * against strings in the opt-array, and `executes' any + * matching action. Any arguments to the options are + * extracted and stored in the variables or passed to + * functions pointed to by entries in opt. + * + * Options and arguments used are removed from the argv- + * array, and argc is decreased accordingly. + * + * Any error leads to program abortion. + * + */ +void optParseOptions(int *argc, char *argv[], optStruct opt[], int allowNegNum) +{ + int ai, /* argv index. */ + optarg, /* argv index of option argument, or -1 if none. */ + mi, /* Match index in opt. */ + done; + char *arg, /* Pointer to argument to an option. */ + *o, /* pointer to an option character */ + *p; + + /* + * Loop through all arguments. + */ + for (ai = 0; ai < *argc; ) { + /* + * "--" indicates that the rest of the argv-array does not + * contain options. + */ + if (strcmp(argv[ai], "--") == 0) { + argvRemove(argc, argv, ai); + break; + } + + if (allowNegNum && argv[ai][0] == '-' && isdigit(argv[ai][1])) { + ++ai; + continue; + } else if (strncmp(argv[ai], "--", 2) == 0) { + /* long option */ + /* find matching option */ + if ((mi = optMatch(opt, argv[ai] + 2, 1)) < 0) + optFatal("unrecognized option `%s'\n", argv[ai]); + + /* possibly locate the argument to this option. */ + arg = NULL; + if ((p = strchr(argv[ai], '=')) != NULL) + arg = p + 1; + + /* does this option take an argument? */ + optarg = -1; + if (optNeedsArgument(&opt[mi])) { + /* option needs an argument. find it. */ + if (!arg) { + if ((optarg = ai + 1) == *argc) + optFatal("option `%s' requires an argument\n", + optString(&opt[mi], 1)); + arg = argv[optarg]; + } + } else { + if (arg) + optFatal("option `%s' doesn't allow an argument\n", + optString(&opt[mi], 1)); + } + /* perform the action of this option. */ + optExecute(&opt[mi], arg, 1); + /* remove option and any argument from the argv-array. */ + if (optarg >= 0) + argvRemove(argc, argv, ai); + argvRemove(argc, argv, ai); + } else if (*argv[ai] == '-') { + /* A dash by itself is not considered an option. */ + if (argv[ai][1] == '\0') { + ++ai; + continue; + } + /* Short option(s) following */ + o = argv[ai] + 1; + done = 0; + optarg = -1; + while (*o && !done) { + /* find matching option */ + if ((mi = optMatch(opt, o, 0)) < 0) + optFatal("unrecognized option `-%c'\n", *o); + + /* does this option take an argument? */ + optarg = -1; + arg = NULL; + if (optNeedsArgument(&opt[mi])) { + /* option needs an argument. find it. */ + arg = o + 1; + if (!*arg) { + if ((optarg = ai + 1) == *argc) + optFatal("option `%s' requires an argument\n", + optString(&opt[mi], 0)); + arg = argv[optarg]; + } + done = 1; + } + /* perform the action of this option. */ + optExecute(&opt[mi], arg, 0); + ++o; + } + /* remove option and any argument from the argv-array. */ + if (optarg >= 0) + argvRemove(argc, argv, ai); + argvRemove(argc, argv, ai); + } else { + /* a non-option argument */ + ++ai; + } + } +} |