* sprintf(), fwrite(), ferror()
*/
#include <stdint.h> /* for uint8_t, uint16_t, uint32_t */
-#include <string.h> /* for strlen()*/
+#include <string.h> /* for strlen() */
#include <unistd.h> /* for unlink() */
#include "rexit.h" /* for exit_err(), exit_trouble() */
#include "main.h" /* for world global */
-/* Read/write "x" from/to "file" as bigendian representation of "size" bits. On
- * failure, return 1, else 0. (As of of now, all extern read/write functions
- * build on top of these.) Only use multiples of 8 greater or equal 32 for
- * "size", so that storage inside uint32_t is possible.
- */
-static uint8_t read_uintX_bigendian(FILE * file, uint32_t * x, uint8_t size);
-static uint8_t write_uintX_bigendian(FILE * file, uint32_t x, uint8_t size);
-
-
-
extern FILE * try_fopen(char * path, char * mode, char * f)
{
char * msg1 = "Trouble in ";
+extern void try_fwrite(void * ptr, size_t size, size_t nmemb, FILE * stream,
+ char * f)
+{
+ exit_trouble(0 == fwrite(ptr, size, nmemb, stream), f, "fwrite()");
+}
+
+
+
extern char * try_fgets(char * line, int linemax, FILE * file, char * f)
{
char * test = fgets(line, linemax, file);
-extern void try_fwrite(void * ptr, size_t size, size_t nmemb, FILE * stream,
- char * f)
+extern uint8_t try_fgetc(FILE * file, char * f)
{
- exit_trouble(0 == fwrite(ptr, size, nmemb, stream), f, "fwrite()");
+ int test = fgetc(file);
+ exit_trouble(EOF == test, f, "fgetc() unexpectedly hitting EOF");
+ return (uint8_t) test;
+}
+
+
+
+extern void try_fputc(uint8_t c, FILE * file, char * f)
+{
+ int test = fputc(c, file);
+ exit_trouble(EOF == test, f, "fputc() hitting EOF");
}
-static uint8_t read_uintX_bigendian(FILE * file, uint32_t * x, uint8_t size)
-{
- * x = 0;
- int16_t bitshift = size - 8;
- int test;
- for (; bitshift >= 0; bitshift = bitshift - 8)
- {
- test = fgetc(file);
- if (EOF == test)
- {
- return 1;
- }
- * x = * x + ((uint32_t) test << bitshift);
- }
- return 0;
-}
-
-
-
-static uint8_t write_uintX_bigendian(FILE * file, uint32_t x, uint8_t size)
-{
- int16_t bitshift = size - 8;
- for (; bitshift >= 0; bitshift = bitshift - 8)
- {
- if (EOF == fputc((x >> bitshift) & 0xFF, file))
- {
- return 1;
- }
- }
- return 0;
-}
-
-
-
-extern uint8_t read_uint8(FILE * file, uint8_t * x)
-{
- /* Since read_uintX_bigendian() works on -- and zeroes -- four bytes, direct
- * work on values of fewer bytes would corrupt immediate neighbor values.
- */
- uint32_t y = * x;
- uint8_t err = read_uintX_bigendian(file, &y, 8);
- * x = (uint8_t) y;
- return err;
-}
-
-
-
-extern uint8_t read_uint32_bigendian(FILE * file, uint32_t * x)
-{
- return read_uintX_bigendian(file, x, 32);
-}
-
-
-
-extern uint8_t write_uint8(uint8_t x, FILE * file)
+extern uint32_t read_uint32_bigendian(FILE * file)
{
- return write_uintX_bigendian(file, x, 8);
+ char * f_name = "read_uint32_bigendian()";
+ uint32_t x;
+ x = (uint32_t) try_fgetc(file, f_name) << 24;
+ x = x + ( (uint32_t) try_fgetc(file, f_name) << 16 );
+ x = x + ( (uint32_t) try_fgetc(file, f_name) << 8 );
+ x = x + (uint32_t) try_fgetc(file, f_name);
+ return x;
}
-extern uint8_t write_uint32_bigendian(uint32_t x, FILE * file)
+extern void write_uint32_bigendian(uint32_t x, FILE * file)
{
- return write_uintX_bigendian(file, x, 32);
+ char * f_name = "write_uint32_bigendian()";
+ try_fputc( x >> 24, file, f_name);
+ try_fputc( ( x >> 16 ) & 0xFF, file, f_name);
+ try_fputc( ( x >> 8 ) & 0xFF, file, f_name);
+ try_fputc( x & 0xFF, file, f_name);
}