57 lines
1.1 KiB
C
57 lines
1.1 KiB
C
#include <assert.h>
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#include <errno.h>
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#include <stddef.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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char* read_textfile(const char* filename)
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{
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FILE* fp = fopen(filename, "r");
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if (!fp) {
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goto couldnt_read_file;
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}
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if (fseek(fp, 0, SEEK_END) != 0) {
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goto couldnt_read_file;
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}
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long file_size = ftell(fp);
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if (file_size < 0) {
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goto couldnt_read_file;
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}
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if (fseek(fp, 0, SEEK_SET) != 0) {
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goto couldnt_read_file;
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}
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char* buffer = malloc(file_size + 1);
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assert(buffer);
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if (fread(buffer, sizeof(char), file_size, fp) != (size_t)file_size) {
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goto couldnt_read_file;
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}
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buffer[file_size] = '\0';
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couldnt_read_file:
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fprintf(stderr,
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"error: couldn't read file '%s': %s\n",
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filename,
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strerror(errno));
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return nullptr;
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}
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int main(int argc, char* argv[])
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{
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if (argc < 2) {
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fprintf(stderr, "error: no filename\n");
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return EXIT_FAILURE;
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}
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char* filename = argv[1];
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char* text = read_textfile(filename);
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if (!text) {
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return EXIT_FAILURE;
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}
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}
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