55 lines
1.7 KiB
C
Vendored
55 lines
1.7 KiB
C
Vendored
#include <wasi/api.h>
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#include <stdlib.h>
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#include <sysexits.h>
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// The user's `main` function, expecting arguments.
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int __main_argc_argv(int argc, char *argv[]);
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// If the user's `main` function expects arguments, the compiler will rename
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// it to `__main_argc_argv`, and this version will get linked in, which
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// initializes the argument data and calls `__main_argc_argv`.
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__attribute__((weak, nodebug))
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int __main_void(void) {
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__wasi_errno_t err;
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// Get the sizes of the arrays we'll have to create to copy in the args.
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size_t argv_buf_size;
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size_t argc;
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err = __wasi_args_sizes_get(&argc, &argv_buf_size);
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if (err != __WASI_ERRNO_SUCCESS) {
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_Exit(EX_OSERR);
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}
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// Add 1 for the NULL pointer to mark the end, and check for overflow.
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size_t num_ptrs = argc + 1;
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if (num_ptrs == 0) {
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_Exit(EX_SOFTWARE);
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}
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// Allocate memory for storing the argument chars.
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char *argv_buf = malloc(argv_buf_size);
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if (argv_buf == NULL) {
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_Exit(EX_SOFTWARE);
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}
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// Allocate memory for the array of pointers. This uses `calloc` both to
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// handle overflow and to initialize the NULL pointer at the end.
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char **argv = calloc(num_ptrs, sizeof(char *));
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if (argv == NULL) {
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free(argv_buf);
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_Exit(EX_SOFTWARE);
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}
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// Fill the argument chars, and the argv array with pointers into those chars.
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// TODO: Remove the casts on `argv_ptrs` and `argv_buf` once the witx is updated with char8 support.
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err = __wasi_args_get((uint8_t **)argv, (uint8_t *)argv_buf);
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if (err != __WASI_ERRNO_SUCCESS) {
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free(argv_buf);
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free(argv);
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_Exit(EX_OSERR);
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}
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// Call `__main_argc_argv` with the arguments!
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return __main_argc_argv(argc, argv);
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}
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