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95 lines
3.1 KiB
C++
95 lines
3.1 KiB
C++
// Implementation of the source builtin.
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#include "config.h" // IWYU pragma: keep
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#include <fcntl.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include <wchar.h>
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#include "builtin.h"
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#include "builtin_source.h"
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#include "common.h"
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#include "env.h"
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#include "fallback.h" // IWYU pragma: keep
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#include "intern.h"
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#include "io.h"
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#include "parser.h"
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#include "proc.h"
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#include "reader.h"
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#include "wutil.h" // IWYU pragma: keep
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/// The source builtin, sometimes called `.`. Evaluates the contents of a file in the current
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/// context.
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int builtin_source(parser_t &parser, io_streams_t &streams, wchar_t **argv) {
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ASSERT_IS_MAIN_THREAD();
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const wchar_t *cmd = argv[0];
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int argc = builtin_count_args(argv);
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help_only_cmd_opts_t opts;
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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, streams.out);
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return STATUS_CMD_OK;
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}
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int fd;
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struct stat buf;
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const wchar_t *fn, *fn_intern;
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if (argc == optind || wcscmp(argv[optind], L"-") == 0) {
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// Either a bare `source` which means to implicitly read from stdin or an explicit `-`.
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fn = L"-";
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fn_intern = fn;
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fd = dup(streams.stdin_fd);
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} else {
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if ((fd = wopen_cloexec(argv[optind], O_RDONLY)) == -1) {
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streams.err.append_format(_(L"%ls: Error encountered while sourcing file '%ls':\n"),
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cmd, argv[optind]);
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builtin_wperror(cmd, streams);
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return STATUS_CMD_ERROR;
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}
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if (fstat(fd, &buf) == -1) {
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close(fd);
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streams.err.append_format(_(L"%ls: Error encountered while sourcing file '%ls':\n"),
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cmd, argv[optind]);
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builtin_wperror(L"source", streams);
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return STATUS_CMD_ERROR;
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}
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if (!S_ISREG(buf.st_mode)) {
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close(fd);
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streams.err.append_format(_(L"%ls: '%ls' is not a file\n"), cmd, argv[optind]);
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return STATUS_CMD_ERROR;
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}
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fn_intern = intern(argv[optind]);
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}
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const source_block_t *sb = parser.push_block<source_block_t>(fn_intern);
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reader_push_current_filename(fn_intern);
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// This is slightly subtle. If this is a bare `source` with no args then `argv + optind` already
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// points to the end of argv. Otherwise we want to skip the file name to get to the args if any.
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env_set_argv(argv + optind + (argc == optind ? 0 : 1));
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retval = reader_read(fd, streams.io_chain ? *streams.io_chain : io_chain_t());
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parser.pop_block(sb);
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if (retval != STATUS_CMD_OK) {
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streams.err.append_format(_(L"%ls: Error while reading file '%ls'\n"), cmd,
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fn_intern == intern_static(L"-") ? L"<stdin>" : fn_intern);
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} else {
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retval = proc_get_last_status();
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}
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// Do not close fd after calling reader_read. reader_read automatically closes it before calling
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// eval.
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reader_pop_current_filename();
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return retval;
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}
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