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options.c
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options.c
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/*
* ts-options.c - a very simple option handler.
*
* Copyright (c) 2015, Phil Maker
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials provided
* with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
#include <string.h>
#include <errno.h>
#include "options.h"
// shared state for option handling - these are
// all exported via get_* functions
static char* progname; // program name argv[0]
static int noptions; // number of options (-opt val)
static char** options; // list of (-opt val)
static int nfiles; // number of filenames
static char** files; // list of filenames
// initialise options based on argc/argv
void init_options(int argc, char* argv[]) {
int i;
// save progname away for error messages
assert(argc >= 1);
progname = argv[0];
// process -opt val pairs first
options = &argv[1];
for(i = 1; i < argc; i++) {
if(argv[i][0] == '-') { // -option
i++;
if(i < argc) { // value ok
noptions++;
} else {
fprintf(stderr, "%s: fatal no argument for %s\n",
progname, argv[i]);
exit(101);
}
} else {
break;
}
}
// the rest must be filenames that we can read
FILE *fp;
files = &argv[i];
for(nfiles = 0; i < argc; i++) {
errno = 0;
if((fp = fopen(argv[i], "r")) == NULL) {
fprintf(stderr, "%s: fatal error cannot open file \"%s\": %s\n",
get_progname(),
argv[i],
strerror(errno));
exit(102);
} else {
fclose(fp);
nfiles++;
}
}
}
// returns progname, i.e. argv[0]
char* get_progname() {
return progname;
}
// return option name for slot i, -opt
static char* get_opt(int i) {
assert(i < noptions);
return options[i*2];
}
// return the value for slot i, arg-a
static char* get_val(int i) {
assert(i < noptions);
return options[(i * 2) + 1];
}
// return the filename for slot i or
// NULL if no more files
char* get_filename(int i) {
if(0 <= i && i < nfiles) {
return files[i];
} else {
return NULL;
}
}
char* bs_nl(char *s) {
if(*s == '\n') {
return "\\n";
} else {
return s;
}
}
// show all options on stdout
void show_options() {
int i;
for(i = 0; i < noptions; i++) {
printf("# option[%d] = %s %s\n", i, get_opt(i),
bs_nl(get_val(i)));
}
for(i = 0; i < nfiles; i++) {
printf("# file[%d] = %s\n", i, files[i]);
}
}
// get value for option opt defaulting to dflt if
// its not given.
char* option(char* opt, char* dflt, char* descr) {
int i;
for(i = 0; i < noptions; i++) {
if(strcmp(opt, get_opt(i)) == 0) { // match
printf("# %s %s -- %s\n", opt, bs_nl(get_val(i)), descr);
return get_val(i);
}
}
printf("# %s %s -- %s\n", opt, bs_nl(dflt), descr);
return dflt;
}
// return bool option
bool option_bool(char* opt, char* dflt, char* descr) {
char* s = option(opt, dflt, descr);
// we could add in plain text options for booleans
return atoi(s) != 0;
}
// return double option
double option_double(char* opt, char* dflt, char* descr) {
return atof(option(opt, dflt, descr));
}
// return long option
long option_long(char* opt, char* dflt, char* descr) {
return atol(option(opt, dflt, descr));
}
tms option_time(char* opt, char* dflt, char* descr) {
return parse_t(option(opt, dflt, descr));
}
tms option_period(char* opt, char* dflt, char* descr) {
return parse_period(option(opt, dflt, descr));
}
#ifdef TEST
int main(int argc, char* argv[]) {
int i;
for(i = 0; i < argc; i++) {
printf("argv[%d] %s\n", i, argv[i]);
}
init_options(argc, argv);
show_options();
return 0;
}
#endif