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tcc -run: support custom stdin with -rstdin FILE

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When tcc -run is used with input file from stdin, then run_main's
stdin (which is tcc's stdin) is already EOF after we've read it.
If the program operates exclusively on stdin, then it cannot be used.

This commit adds an option -rstdin FILE which sets run_main's stdin.

Can also be used in such case to set run_main's stdin to the tty,
using -rstdin /dev/tty (posix) or -rstdin con (windows).
This commit is contained in:
Avi Halachmi (:avih)
2025-10-27 14:28:47 +02:00
parent 234e2dd2bf
commit f4e01bfcab
4 changed files with 21 additions and 1 deletions
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8
libtcc.c
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@@ -1547,6 +1547,7 @@ enum {
TCC_OPTION_rdynamic,
TCC_OPTION_pthread,
TCC_OPTION_run,
TCC_OPTION_rstdin,
TCC_OPTION_w,
TCC_OPTION_E,
TCC_OPTION_M,
@@ -1637,6 +1638,7 @@ static const TCCOption tcc_options[] = {
{ "o", TCC_OPTION_o, TCC_OPTION_HAS_ARG },
{ "pthread", TCC_OPTION_pthread, 0},
{ "run", TCC_OPTION_run, TCC_OPTION_HAS_ARG | TCC_OPTION_NOSEP },
{ "rstdin", TCC_OPTION_rstdin, TCC_OPTION_HAS_ARG },
{ "rdynamic", TCC_OPTION_rdynamic, 0 },
{ "r", TCC_OPTION_r, 0 },
{ "Wl,", TCC_OPTION_Wl, TCC_OPTION_HAS_ARG | TCC_OPTION_NOSEP },
@@ -2041,6 +2043,12 @@ PUB_FUNC int tcc_parse_args(TCCState *s, int *pargc, char ***pargv)
goto set_output_type;
#else
return tcc_error_noabort("-run is not available in a cross compiler");
#endif
#ifdef TCC_IS_NATIVE
case TCC_OPTION_rstdin:
/* custom stdin for run_main */
s->run_stdin = optarg;
break;
#endif
case TCC_OPTION_v:
do ++s->verbose; while (*optarg++ == 'v');

2
tcc.c
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@@ -35,7 +35,7 @@ static const char help[] =
"General options:\n"
" -c compile only - generate an object file\n"
" -o outfile set output filename\n"
" -run run compiled source\n"
" -run run compiled source [with custom stdin: -rstdin FILE]\n"
" -fflag set or reset (with 'no-' prefix) 'flag' (see tcc -hh)\n"
" -Wwarning set or reset (with 'no-' prefix) 'warning' (see tcc -hh)\n"
" -w disable all warnings\n"

1
tcc.h
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@@ -976,6 +976,7 @@ struct TCCState {
const char *run_main; /* entry for tcc_run() */
void *run_ptr; /* runtime_memory */
unsigned run_size; /* size of runtime_memory */
const char *run_stdin; /* custom stdin file for run_main */
#ifdef _WIN64
void *run_function_table; /* unwind data */
#endif

11
tccrun.c
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@@ -233,6 +233,17 @@ LIBTCCAPI int tcc_run(TCCState *s1, int argc, char **argv)
prog_main = (void*)get_sym_addr(s1, s1->run_main, 1, 1);
if ((addr_t)-1 == (addr_t)prog_main)
return -1;
/* custom stdin for run_main, mainly if stdin is/was an input file.
* fileno(stdin) should remain 0, as posix mandates to use the smallest
* free fd, which is 0 after the initial fclose in freopen. windows too.
* to set stdin to the tty, use /dev/tty (posix) or con (windows).
*/
if (s1->run_stdin && !freopen(s1->run_stdin, "r", stdin)) {
tcc_error_noabort("failed to reopen stdin from '%s'", s1->run_stdin);
return -1;
}
errno = 0; /* clean errno value */
fflush(stdout);
fflush(stderr);