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#include "../core/state.h"
#include "../core/interpret.h"
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdbool.h>
#include <errno.h>
int read_file(const char *file_path, char **out_buffer, size_t *out_length) {
assert(out_buffer != NULL && *out_buffer == NULL);
assert(file_path != NULL);
const size_t CHUNK_SIZE = 1024;
FILE *fp = fopen(file_path, "r");
if (fp == NULL) {
return -1;
}
char *buffer = NULL;
size_t allocated = 0;
size_t used = 0;
while (true) {
// Grow buffer, if needed.
if (used + CHUNK_SIZE > allocated) {
// Grow exponentially to guarantee O(log(n)) performance.
allocated = (allocated == 0) ? CHUNK_SIZE : allocated * 2;
// Overflow check. Some ANSI C compilers may optimize this away, though.
if (allocated <= used) {
free(buffer);
fclose(fp);
errno = EOVERFLOW;
return -1;
}
char *temp = realloc(buffer, allocated);
if (temp == NULL) {
int old_errno = errno;
free(buffer); // free() may not set errno
fclose(fp); // fclose() may set errno
errno = old_errno;
return -1;
}
buffer = temp;
}
size_t nread = fread(buffer + used, 1, CHUNK_SIZE, fp);
if (nread == 0) {
// End-of-file or errnor has occured.
// FIXME: Should we be checking (nread < CHUNK_SIZE)?
// https://stackoverflow.com/a/39322170
break;
}
used += nread;
}
if (ferror(fp)) {
int old_errno = errno;
free(buffer); // free() may not set errno
fclose(fp); // fclose() may set errno
errno = old_errno;
return -1;
}
// Reallocate to optimal size.
char *temp = realloc(buffer, used + 1);
if (temp == NULL) {
int old_errno = errno;
free(buffer); // free() may not set errno
fclose(fp); // fclose() may set errno
errno = old_errno;
return -1;
}
buffer = temp;
// Null-terminate the buffer. Note that buffers may still contain \0,
// so strlen(buffer) == length may not be true.
buffer[used] = '\0';
// Return buffer.
*out_buffer = buffer;
if (out_length != NULL) {
*out_length = used;
}
fclose(fp);
return 0;
}
static void run_file(SandState *S, const char *filename) {
char *source = NULL;
size_t source_length = 0;
if (read_file(filename, &source, &source_length) < 0) {
fprintf(stderr, "Error reading %s: %s\n", filename, strerror(errno));
exit(74);
}
SandInterpretResult result = sand_interpret(S, filename, source, source_length);
free(source); // At this point it should be okay to invalidate all references to the source code.
if (result == SAND_INTERPRET_COMPILE_ERROR) {
exit(65);
} else if (result == SAND_INTERPRET_RUNTIME_ERROR) {
exit(70);
}
}
static void repl(SandState *S) {
char *line = NULL;
size_t line_capacity = 0;
ssize_t line_length = 0;
unsigned prompt_nr = 1;
while (true) {
printf("> ");
fflush(stdout);
// At this point the memory at `line` is reused, invalidating all existing references.
if ((line_length = getline(&line, &line_capacity, stdin)) < 0) {
fputc('\n', stdout);
break; // No more input - leave REPL loop.
}
// We need a dummy filename.
char filename[64];
snprintf(filename, sizeof(filename), "<repl %u>", prompt_nr);
prompt_nr += 1;
sand_interpret(S, filename, line, line_length);
}
free(line);
}
static void print_help(FILE *stream, const char *argv0) {
fprintf(stream, "Usage: %s <filename>\n", argv0);
fprintf(stream, " %s --help\n", argv0);
fprintf(stream, " %s\n\n", argv0);
fprintf(stream, "When called without arguments, runs a REPL.\n");
}
static void print_handler(const char *message, size_t message_length) {
fprintf(stdout, message, message_length);
}
void diagnostic_handler(const SandLocation *location, SandDiagnosticLevel level, const char *message, size_t message_length) {
sand_print_location(stderr, location);
switch (level) {
case SAND_DIAGNOSTIC_INFO: fprintf(stderr, ": info"); break;
case SAND_DIAGNOSTIC_WARNING: fprintf(stderr, ": warning"); break;
case SAND_DIAGNOSTIC_ERROR: fprintf(stderr, ": error"); break;
}
fprintf(stderr, ": %.*s\n", (int)message_length, message);
}
int main(int argc, char *argv[]) {
SandConfig config = {
.print_handler = print_handler,
.diagnostic_handler = diagnostic_handler,
};
SandState state = sand_create_state(config);
// TEMP
SandLocation loc = {
.filename = "fake.sand",
.start_line = 0,
.start_column = 0,
.end_line = 0,
.end_column = 5,
};
sand_print_diagnostic(&state, &loc, SAND_DIAGNOSTIC_INFO, "This is a test info message");
sand_print_diagnostic(&state, &loc, SAND_DIAGNOSTIC_WARNING, "oh no the number is %d", 5);
sand_print_diagnostic(&state, &loc, SAND_DIAGNOSTIC_ERROR, "gaide gad error here %d", 5);
if (argc == 1) {
repl(&state);
} else if (argc == 2 && strcmp(argv[1], "--help") == 0) {
print_help(stdout, argv[0]);
exit(0);
} else if (argc == 2) {
run_file(&state, argv[1]);
} else {
print_help(stderr, argv[0]);
exit(64);
}
sand_destroy_state(&state);
return 0;
}
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