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#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
int main()
{
// Reading
FILE *file = fopen("somefile.binary", "rb");
assert(file);
fseek(file, 0, SEEK_END);
int size = ftell(file);
rewind (file);
printf("size: %d\n", size);
char *buffer = (char*) malloc (sizeof(char)*size);
assert(buffer);
size_t read = fread(buffer, 1, size, file);
assert(read == size);
printf("data: %d", buffer[0]);
for (int i = 1; i < size; i++)
printf(",%d", buffer[i]);
printf("\n");
fclose (file);
free (buffer);
// Do it again, with a loop on feof
printf("loop: ");
file = fopen("somefile.binary", "rb");
assert(file);
while (!feof(file)) {
char c = fgetc(file);
if (c != EOF) printf("%d ", c);
}
fclose (file);
printf("\n");
// Standard streams
printf("input:%s\n", gets((char*)malloc(1024)));
fwrite("texto\n", 1, 6, stdout);
fwrite("texte\n", 1, 6, stderr);
putchar('$');
putc('\n', stdout);
// Writing
char data[5] = { 10, 30, 20, 11, 88 };
FILE *outf = fopen("go.out", "wb");
fwrite(data, 1, 5, outf);
fclose(outf);
FILE *devNull = fopen("/dev/null", "rb");
assert(devNull);
char data2[10];
FILE *inf = fopen("go.out", "rb");
// make sure pread returns 0 if we read starting at the end (or past the end) of the file
int num = pread(fileno(inf), data2, 10, 5);
assert(num == 0);
num = pread(fileno(inf), data2, 10, sizeof(data)*8);
assert(num == 0);
num = fread(data2, 1, 10, inf);
fclose(inf);
printf("%d : %d,%d,%d,%d,%d\n", num, data2[0], data2[1], data2[2], data2[3], data2[4]);
// Test reading a file that has not been cached
FILE *other = fopen("test.file", "r");
assert(other);
char otherData[1000];
num = fread(otherData, 1, 9, other);
otherData[num] = 0;
printf("other=%s.\n", otherData);
// Seeking
fseek(other, 2, SEEK_SET);
num = fread(otherData, 1, 5, other);
otherData[num] = 0;
printf("seeked=%s.\n", otherData);
fseek(other, -1, SEEK_CUR);
num = fread(otherData, 1, 3, other);
otherData[num] = 0;
printf("seeked=%s.\n", otherData);
fseek(other, -2, SEEK_END);
num = fread(otherData, 1, 2, other);
otherData[num] = 0;
printf("seeked=%s.\n", otherData);
fclose(other);
// fscanf
outf = fopen("fscan.f", "w");
fprintf(outf, "10 hello");
fclose(outf);
int number;
char text[100];
inf = fopen("fscan.f", "r");
num = fscanf(inf, "%d %s", &number, text);
fclose(inf);
printf("fscanfed: %d - %s\n", number, text);
// temp files
const char *tname = "file_XXXXXX.txt";
char tname1[100];
char tname2[100];
strcpy(tname1, tname);
strcpy(tname2, tname);
assert(!strcmp(tname1, tname2)); // equal
int f1 = mkstemp(tname1);
int f2 = mkstemp(tname2);
assert(f1 != f2);
//printf("%d,%d,%s,%s\n", f1, f2, tname1, tname2);
assert(strcmp(tname1, tname2)); // not equal
assert(fopen(tname1, "r"));
assert(fopen(tname2, "r"));
assert(!fopen(tname2+1, "r")); // sanity check that we can't open just anything
printf("ok.\n");
return 0;
}
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