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Add option parsing to the shell.

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This commit is contained in:
Jonas 'Sortie' Termansen 2014-09-15 22:56:15 +02:00
parent 46d16f9e4c
commit 186ed27576
1 changed files with 192 additions and 44 deletions
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236
sh/sh.cpp
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@ -33,6 +33,7 @@
#include <inttypes.h>
#include <ioleast.h>
#include <libgen.h>
#include <locale.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
@ -42,6 +43,10 @@
#include <wchar.h>
#include <wctype.h>
#if !defined(VERSIONSTR)
#define VERSIONSTR "unknown version"
#endif
static const unsigned int NORMAL_TERMMODE =
TERMMODE_UNICODE |
TERMMODE_SIGNAL |
@ -1812,18 +1817,13 @@ int get_and_run_command_non_interactive(FILE* fp,
return run_command(command, false, exit_on_error, exitexec);
}
void load_argv_variables(int argc, char* argv[])
int run(FILE* fp, const char* name, bool interactive, bool exit_on_error)
{
char varname[sizeof(int) * 3];
for ( int i = 0; i < argc; i++ )
snprintf(varname, sizeof(varname), "%i", i),
setenv(varname, argv[i], 1);
}
int run(FILE* fp, int argc, char* argv[], const char* name, bool interactive,
bool exit_on_error)
{
load_argv_variables(argc, argv);
// TODO: The interactive read code should cope when the input is not a
// terminal; it should print the prompt and then read normally without
// any line editing features.
if ( !isatty(fileno(fp)) )
interactive = false;
bool exitexec = false;
int exitstatus;
do
@ -1838,45 +1838,119 @@ int run(FILE* fp, int argc, char* argv[], const char* name, bool interactive,
return exitstatus;
}
int run_interactive(int argc, char* argv[], bool exit_on_error)
void compact_arguments(int* argc, char*** argv)
{
return run(stdin, argc, argv, "<stdin>", true, exit_on_error);
for ( int i = 0; i < *argc; i++ )
{
while ( i < *argc && !(*argv)[i] )
{
for ( int n = i; n < *argc; n++ )
(*argv)[n] = (*argv)[n+1];
(*argc)--;
}
}
}
int run_stdin(int argc, char* argv[], bool exit_on_error)
void help(FILE* fp, const char* argv0)
{
return run(stdin, argc, argv, "<stdin>", false, exit_on_error);
fprintf(fp, "Usage: %s [OPTION...] [SCRIPT [ARGUMENT...]]\n", argv0);
fprintf(fp, " or: %s [OPTION...] -c COMMAND [ARGUMENT...]\n", argv0);
fprintf(fp, " or: %s [OPTION...] -s [ARGUMENT...]\n", argv0);
#if 0
fprintf(fp, " -a, +a set -a\n");
fprintf(fp, " -b, +b set -b\n");
#endif
fprintf(fp, " -c execute the first operand as the command\n");
#if 0
fprintf(fp, " -C, +C set -C\n");
fprintf(fp, " -e, +e set -e\n");
fprintf(fp, " -f, +f set -f\n");
fprintf(fp, " -h, +h set -h\n");
#endif
fprintf(fp, " -i shell is interactive\n");
#if 0
fprintf(fp, " -m, +m set -m\n");
fprintf(fp, " -n, +n set -n\n");
fprintf(fp, " -o OPTION set -o OPTION\n");
fprintf(fp, " +o OPTION set +o OPTION\n");
#endif
fprintf(fp, " -s read commands from the standard input\n");
#if 0
fprintf(fp, " -u, +u set -u\n");
fprintf(fp, " -v, +v set -v\n");
fprintf(fp, " -x, +x set -x\n");
#endif
fprintf(fp, " --help display this help and exit\n");
fprintf(fp, " --version output version information and exit\n");
}
int run_string(int argc, char* argv[], const char* str, bool exit_on_error)
void version(FILE* fp, const char* argv0)
{
FILE* fp = fmemopen((void*) str, strlen(str), "r");
if ( !fp ) { error(0, errno, "fmemopen"); return 1; }
int ret = run(fp, argc, argv, "<command-line>", false, exit_on_error);
fclose(fp);
return ret;
}
int run_script(const char* path, int argc, char* argv[], bool exit_on_error)
{
FILE* fp = fopen(path, "r");
if ( !fp ) { error(0, errno, "%s", path); return 127; }
int ret = run(fp, argc, argv, path, false, exit_on_error);
fclose(fp);
return ret;
fprintf(fp, "%s (Sortix) %s\n", argv0, VERSIONSTR);
fprintf(fp, "License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.\n");
fprintf(fp, "This is free software: you are free to change and redistribute it.\n");
fprintf(fp, "There is NO WARRANTY, to the extent permitted by law.\n");
}
int main(int argc, char* argv[])
{
bool exit_on_error = false;
if ( 2 <= argc && !strcmp(argv[1], "-e") )
{
exit_on_error = true;
argc--;
setlocale(LC_ALL, "");
// TODO: Canonicalize argv[0] if it contains a slash and isn't absolute?
bool flag_c_first_operand_is_command = false;
bool flag_e_exit_on_error = false;
bool flag_i_interactive = false;
bool flag_s_stdin = false;
const char* argv0 = argv[0];
for ( int i = 1; i < argc; i++ )
argv[i] = argv[i+1];
argv[argc] = NULL;
{
const char* arg = argv[i];
if ( (arg[0] != '-' && arg[0] != '+') || !arg[1] )
break;
argv[i] = NULL;
if ( !strcmp(arg, "--") )
break;
if ( arg[0] == '+' )
{
while ( char c = *++arg ) switch ( c )
{
case 'e': flag_e_exit_on_error = false; break;
default:
fprintf(stderr, "%s: unknown option -- '%c'\n", argv0, c);
help(stderr, argv0);
exit(1);
}
}
else if ( arg[1] != '-' )
{
while ( char c = *++arg ) switch ( c )
{
case 'c': flag_c_first_operand_is_command = true; break;
case 'e': flag_e_exit_on_error = true; break;
case 'i': flag_i_interactive = true; break;
case 's': flag_s_stdin = true; break;
default:
fprintf(stderr, "%s: unknown option -- '%c'\n", argv0, c);
help(stderr, argv0);
exit(1);
}
}
else if ( !strcmp(arg, "--help") )
help(stdout, argv0), exit(0);
else if ( !strcmp(arg, "--version") )
version(stdout, argv0), exit(0);
else
{
fprintf(stderr, "%s: unknown option: %s\n", argv0, arg);
help(stderr, argv0);
exit(1);
}
}
compact_arguments(&argc, &argv);
if ( getenv("SHLVL") )
{
long shlvl = atol(getenv("SHLVL"));
@ -1892,6 +1966,7 @@ int main(int argc, char* argv[])
{
setenv("SHLVL", "1", 1);
}
char pidstr[3 * sizeof(pid_t)];
char ppidstr[3 * sizeof(pid_t)];
snprintf(pidstr, sizeof(pidstr), "%ji", (intmax_t) getpid());
@ -1901,11 +1976,84 @@ int main(int argc, char* argv[])
setenv("PPID", ppidstr, 1);
setenv("?", "0", 1);
update_pwd();
if ( 2 <= argc && !strcmp(argv[1], "-c") )
return run_string(argc, argv, argv[2], exit_on_error);
if ( 1 < argc )
return run_script(argv[1], argc-1, argv+1, exit_on_error);
if ( isatty(0) )
return run_interactive(argc, argv, exit_on_error);
return run_stdin(argc, argv, exit_on_error);
setenv("0", argv[0], 1);
int status = 0;
if ( flag_c_first_operand_is_command )
{
if ( argc <= 1 )
error(2, 0, "option -c expects an operand");
for ( int i = 2; i < argc; i++ )
{
char varname[sizeof(int) * 3];
snprintf(varname, sizeof(varname), "%i", i - 2);
setenv(varname, argv[i], 1);
}
const char* command = argv[1];
size_t command_length = strlen(command);
FILE* fp = fmemopen((void*) command, command_length, "r");
if ( !fp )
error(2, errno, "fmemopen");
status = run(fp, "<command-line>", false, flag_e_exit_on_error);
fclose(fp);
if ( status != 0 && flag_e_exit_on_error )
exit(status);
if ( flag_s_stdin )
{
bool is_interactive = flag_i_interactive || isatty(fileno(stdin));
status = run(stdin, "<stdin>", is_interactive, flag_e_exit_on_error);
if ( status != 0 && flag_e_exit_on_error )
exit(status);
}
}
else if ( flag_s_stdin )
{
for ( int i = 1; i < argc; i++ )
{
char varname[sizeof(int) * 3];
snprintf(varname, sizeof(varname), "%i", i - 1);
setenv(varname, argv[i], 1);
}
bool is_interactive = flag_i_interactive || isatty(fileno(stdin));
status = run(stdin, "<stdin>", is_interactive, flag_e_exit_on_error);
if ( status != 0 && flag_e_exit_on_error )
exit(status);
}
else if ( 2 <= argc )
{
for ( int i = 1; i < argc; i++ )
{
char varname[sizeof(int) * 3];
snprintf(varname, sizeof(varname), "%i", i - 1);
setenv(varname, argv[i], 1);
}
const char* path = argv[1];
FILE* fp = fopen(path, "r");
if ( !fp )
error(127, errno, "%s", path);
status = run(fp, path, false, flag_e_exit_on_error);
fclose(fp);
if ( status != 0 && flag_e_exit_on_error )
exit(status);
}
else
{
bool is_interactive = flag_i_interactive || isatty(fileno(stdin));
status = run(stdin, "<stdin>", is_interactive, flag_e_exit_on_error);
if ( status != 0 && flag_e_exit_on_error )
exit(status);
}
return 0;
}