zth-vcd.cpp

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/*
 * SPDX-FileCopyrightText: 2019-2026 Jochem Rutgers
 *
 * SPDX-License-Identifier: MPL-2.0
 */
 
#include <zth>
 
static void show_help(char const* prog, FILE* out = stdout)
{
        fprintf(out, "Convert Zth perf output to VCD format.\n\n");
 
        fprintf(out, "Usage: %s [-h|--help] [--] <perf-file> [<vcd-file>]\n\n", prog);
 
        fprintf(out, "Options:\n");
        fprintf(out, "  -h, --help    Show this help message and exit\n");
        fprintf(out, "Arguments:\n");
        fprintf(out, "  <perf-file>   Path to the input perf file (required)\n");
        fprintf(out,
                "  <vcd-file>    Path to the output VCD file (optional, defaults to stdout)\n");
}
 
int main(int argc, char* argv[])
{
        if(argc < 2) {
                show_help(argv[0], stderr);
                return 1;
        }
 
        char const* perf_path = nullptr;
        char const* vcd_path = nullptr;
        bool options = true;
 
        for(int i = 1; i < argc; ++i) {
                if(options && strcmp(argv[i], "--") == 0) {
                        options = false;
                } else if(
                        options && (strcmp(argv[i], "-h") == 0 || strcmp(argv[i], "--help") == 0)) {
                        show_help(argv[0]);
                        return 0;
                } else if(!perf_path) {
                        perf_path = argv[i];
                } else if(!vcd_path) {
                        vcd_path = argv[i];
                } else {
                        fprintf(stderr, "Unexpected argument: %s\n", argv[i]);
                        show_help(argv[0], stderr);
                        return 1;
                }
        }
 
        if(!perf_path) {
                fprintf(stderr, "Error: <perf-file> is required\n");
                show_help(argv[0], stderr);
                return 1;
        }
 
        FILE* fperf = fopen(perf_path, "rb");
        if(!fperf) {
                fprintf(stderr, "Error opening perf file '%s': %s\n", perf_path, strerror(errno));
                return 2;
        }
 
        FILE* fvcd = stdout;
        if(vcd_path) {
                fvcd = fopen(vcd_path, "wb");
                if(!fvcd) {
                        fprintf(stderr, "Error opening VCD file '%s': %s\n", vcd_path,
                                strerror(errno));
                        (void)fclose(fperf);
                        return 2;
                }
        }
 
        int res = zth::perf_vcdf(fperf, fvcd);
 
        (void)fclose(fperf);
        (void)fclose(fvcd);
 
        if(res) {
                fprintf(stderr, "Error converting perf to VCD: %s\n", strerror(res));
                return 3;
        }
 
        return 0;
}