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60 lines
2.0 KiB
C++
60 lines
2.0 KiB
C++
// Implementation of the realpath builtin.
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#include "config.h" // IWYU pragma: keep
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#include "builtin_realpath.h"
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#include <cstdio>
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#include <cstdlib>
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#include <cstring>
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#include <cwchar>
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#include "builtin.h"
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#include "common.h"
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#include "fallback.h" // IWYU pragma: keep
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#include "io.h"
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#include "wutil.h" // IWYU pragma: keep
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/// An implementation of the external realpath command. Doesn't support any options.
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/// In general scripts shouldn't invoke this directly. They should just use `realpath` which
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/// will fallback to this builtin if an external command cannot be found.
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int builtin_realpath(parser_t &parser, io_streams_t &streams, wchar_t **argv) {
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const wchar_t *cmd = argv[0];
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help_only_cmd_opts_t opts;
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int argc = builtin_count_args(argv);
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int optind;
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int retval = parse_help_only_cmd_opts(opts, &optind, argc, argv, parser, streams);
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if (retval != STATUS_CMD_OK) return retval;
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if (opts.print_help) {
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builtin_print_help(parser, streams, cmd);
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return STATUS_CMD_OK;
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}
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if (optind + 1 != argc) { // TODO: allow arbitrary args. `realpath *` should print many paths
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streams.err.append_format(BUILTIN_ERR_ARG_COUNT1, cmd, 1, argc - optind);
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builtin_print_help(parser, streams, cmd);
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return STATUS_INVALID_ARGS;
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}
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if (auto real_path = wrealpath(argv[optind])) {
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streams.out.append(*real_path);
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} else {
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if (errno) {
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// realpath() just couldn't do it. Report the error and make it clear
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// this is an error from our builtin, not the system's realpath.
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streams.err.append_format(L"builtin %ls: %ls: %s\n", cmd, argv[optind],
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std::strerror(errno));
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} else {
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// Who knows. Probably a bug in our wrealpath() implementation.
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streams.err.append_format(_(L"builtin %ls: Invalid path: %ls\n"), cmd, argv[optind]);
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}
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return STATUS_CMD_ERROR;
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}
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streams.out.append(L"\n");
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return STATUS_CMD_OK;
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}
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