source: libcfa/src/parseargs.cfa@ e699eb6

#include "parseargs.hfa"

#include <stdint.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
extern "C" {
        #include <getopt.h>
        #include <sys/ioctl.h>

        struct FILE;
        extern FILE * stderr;
        extern FILE * stdout;

        extern int fileno(FILE *stream);

        extern int fprintf ( FILE * stream, const char * format, ... );

        extern          long long int strtoll (const char* str, char** endptr, int base);
        extern unsigned long long int strtoull(const char* str, char** endptr, int base);
}

#include "common.hfa"
#include "limits.hfa"

void printopt(FILE * out, int width, int max, char sn, const char * ln, const char * help) {
        int hwidth = max - (11 + width);
        if(hwidth <= 0) hwidth = max;

        fprintf(out, "  -%c, --%-*s   %.*s\n", sn, width, ln, hwidth, help);
        for() {
                help += min(strlen(help), hwidth);
                if('\0' == *help) break;
                fprintf(out, "%*s%.*s\n", width + 11, "", hwidth, help);
        }
}

void parse_args(
        int argc,
        char * argv[],
        cfa_option options[],
        size_t opt_count,
        const char * usage,
        char ** & left
) {
        struct option optarr[opt_count + 2];
        int width = 0;
        int max_width = 1_000_000;
        {
                int idx = 0;
                for(i; opt_count) {
                        if(options[i].long_name) {
                                optarr[idx].name = options[i].long_name;
                                optarr[idx].flag = 0p;
                                optarr[idx].val  = options[i].short_name;
                                if(    ((intptr_t)options[i].parse) == ((intptr_t)parse_settrue)
                                    || ((intptr_t)options[i].parse) == ((intptr_t)parse_setfalse) ) {
                                        optarr[idx].has_arg = no_argument;
                                } else {
                                        optarr[idx].has_arg = required_argument;
                                }
                                idx++;

                                int w = strlen(options[i].long_name);
                                if(w > width) width = w;
                        }
                }
                optarr[idx+0].[name, has_arg, flag, val] = ["help", no_argument, 0, 'h'];
                optarr[idx+1].[name, has_arg, flag, val] = [0, no_argument, 0, 0];
        }

        char optstring[opt_count * 3] = { '\0' };
        {
                int idx = 0;
                for(i; opt_count) {
                        optstring[idx] = options[i].short_name;
                        idx++;
                        if(    ((intptr_t)options[i].parse) != ((intptr_t)parse_settrue)
                            && ((intptr_t)options[i].parse) != ((intptr_t)parse_setfalse) ) {
                                optstring[idx] = ':';
                                idx++;
                        }
                }
                optstring[idx+0] = 'h';
                optstring[idx+1] = '\0';
        }

        FILE * out = stderr;
        NEXT_ARG:
        for() {
                int idx = 0;
                int opt = getopt_long(argc, argv, optstring, optarr, &idx);
                switch(opt) {
                        case -1:
                                if(&left != 0p) left = argv + optind;
                                return;
                        case 'h':
                                out = stdout;
                        case '?':
                                goto USAGE;
                        default:
                                for(i; opt_count) {
                                        if(opt == options[i].short_name) {
                                                const char * arg = optarg ? optarg : "";
                                                bool success = options[i].parse( arg, options[i].variable );
                                                if(success) continue NEXT_ARG;

                                                fprintf(out, "Argument '%s' for option %c could not be parsed\n\n", arg, (char)opt);
                                                goto USAGE;
                                        }
                                }
                                abort("Internal parse arg error\n");
                }

        }

        USAGE:;
        int outfd = fileno(out);
        if(isatty(outfd)) {
                struct winsize size;
                int ret = ioctl(outfd, TIOCGWINSZ, &size);
                if(ret < 0) abort( "ioctl error: (%d) %s\n", (int)errno, strerror(errno) );
                max_width = size.ws_col;
        }

        fprintf(out, "Usage:\n  %s %s\n", argv[0], usage);

        for(i; opt_count) {
                printopt(out, width, max_width, options[i].short_name, options[i].long_name, options[i].help);
        }
        fprintf(out, "  -%c, --%-*s   %s\n", 'h', width, "help", "print this help message");
        exit(out == stdout ? 0 : 1);
}

bool parse_yesno(const char * arg, bool & value ) {
        if(strcmp(arg, "yes") == 0) {
                value = true;
                return true;
        }

        if(strcmp(arg, "no") == 0) {
                value = false;
                return true;
        }

        return false;
}

bool parse_settrue (const char *, bool & value ) {
        value = true;
        return true;
}

bool parse_setfalse(const char *, bool & value )  {
        value = false;
        return true;
}

bool parse(const char * arg, const char * & value ) {
        value = arg;
        return true;
}

bool parse(const char * arg, unsigned & value) {
        char * end;
        unsigned long long int r = strtoull(arg, &end, 10);
        if(*end != '\0') return false;
        if(r > (unsigned)MAX) return false;

        value = r;
        return true;
}

bool parse(const char * arg, size_t & value) {
        char * end;
        unsigned long long int r = strtoull(arg, &end, 10);
        if(*end != '\0') return false;
        if(r > (size_t)MAX) return false;

        value = r;
        return true;
}

bool parse(const char * arg, int & value) {
        char * end;
        int r = strtoll(arg, &end, 10);
        if(*end != '\0') return false;

        value = r;
        return true;
}