-#include <stdio.h>
-#include <limits.h>
-#include <stdint.h>
-#define UCHARSIZE (UCHAR_MAX + 1)
-
-uint16_t read_uint16_bigendian(FILE * file) {
-// Read uint16 from file in big-endian order.
- unsigned char a = fgetc(file);
- unsigned char b = fgetc(file);
- return (a * UCHARSIZE) + b; }
-
-void write_uint16_bigendian(uint16_t x, FILE * file) {
-// Write uint16 to file in beg-endian order.
- unsigned char a = x / UCHARSIZE;
- unsigned char b = x % UCHARSIZE;
- fputc(a, file);
- fputc(b, file); }
-
-uint32_t read_uint32_bigendian(FILE * file) {
-// Read uint32 from file in big-endian order.
- unsigned char a = fgetc(file);
- unsigned char b = fgetc(file);
- unsigned char c = fgetc(file);
- unsigned char d = fgetc(file);
- return (a * UCHARSIZE * UCHARSIZE * UCHARSIZE) + (b * UCHARSIZE * UCHARSIZE) + (c * UCHARSIZE) + d; }
-
-void write_uint32_bigendian(uint32_t x, FILE * file) {
-// Write uint32 to file in beg-endian order.
- unsigned char a = x / (UCHARSIZE * UCHARSIZE * UCHARSIZE);
- unsigned char b = (x - (a * UCHARSIZE * UCHARSIZE * UCHARSIZE)) / (UCHARSIZE * UCHARSIZE);
- unsigned char c = (x - ((a * UCHARSIZE * UCHARSIZE * UCHARSIZE) + (b * UCHARSIZE * UCHARSIZE))) / UCHARSIZE;
- unsigned char d = x % UCHARSIZE;
- fputc(a, file);
- fputc(b, file);
- fputc(c, file);
- fputc(d, file); }
+/* readwrite.c */
+
+#include "readwrite.h"
+#include <stdio.h> /* for FILE typedef, fopen(), fgetc(), fputc(), fseek(),
+ * sprintf(), fwrite(), ferror()
+ */
+#include <stdint.h> /* for uint8_t, uint16_t, uint32_t */
+#include <string.h> /* for strlen() */
+#include <unistd.h> /* for unlink() */
+#include "rexit.h" /* for exit_err(), exit_trouble() */
+#include "main.h" /* for world global */
+
+
+
+extern FILE * try_fopen(char * path, char * mode, char * f)
+{
+ char * msg1 = "Trouble in ";
+ char * msg2 = " with fopen() (mode '";
+ char * msg3 = "') on path '";
+ char * msg4 = "'.";
+ uint16_t size = strlen(msg1) + strlen(msg2) + strlen(msg3) + strlen(msg4)
+ + strlen(f) + strlen(path) + strlen(mode) + 1;
+ char msg[size];
+ sprintf(msg, "%s%s%s%s%s%s%s", msg1, f, msg2, mode, msg3, path, msg4);
+ FILE * file_p = fopen(path, mode);
+ exit_err(NULL == file_p, msg);
+ return file_p;
+}
+
+
+
+extern void try_fclose(FILE * file, char * f)
+{
+ exit_trouble(fclose(file), f, "fclose()");
+}
+
+
+
+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 void try_fputc(uint8_t c, FILE * file, char * f)
+{
+ exit_trouble(EOF == fputc(c, file), f, "fputc()");
+}
+
+
+
+extern char * try_fgets(char * line, int linemax, FILE * file, char * f)
+{
+ char * test = fgets(line, linemax, file);
+ exit_trouble(NULL == test && ferror(file), f, "fgets()");
+ return test;
+}
+
+
+
+extern int try_fgetc(FILE * file, char * f)
+{
+ int test = fgetc(file);
+ exit_trouble(EOF == test && ferror(file), f, "fgetc()");
+ return test;
+}
+
+
+
+extern uint8_t try_fgetc_noeof(FILE * file, char * f)
+{
+ char * f_name = "try_fgetc_noeof()";
+ int test = try_fgetc(file, f_name);
+ exit_trouble(EOF == test, f, "fgetc() unexpectedly hitting EOF");
+ return (uint8_t) test;
+}
+
+
+
+extern void try_fclose_unlink_rename(FILE * file, char * p1, char * p2,
+ char * f)
+{
+ try_fclose(file, f);
+ char * msg1 = "Trouble in ";
+ char * msg4 = "'.";
+ if (!access(p2, F_OK))
+ {
+ char * msg2 = " with unlink() on path '";
+ uint16_t size = strlen(msg1) + strlen(msg2) + strlen(msg4)
+ + strlen(f) + strlen(p2) + 1;
+ char msg[size];
+ sprintf(msg, "%s%s%s%s%s", msg1, f, msg2, p2, msg4);
+ exit_err(unlink(p2), msg);
+ }
+ char * msg2 = " with rename() from '";
+ char * msg3 = "' to '";
+ uint16_t size = strlen(msg1) + strlen(f) + strlen(msg2) + strlen(p1)
+ + strlen(msg3) + strlen(p2) + strlen(msg4) + 1;
+ char msg[size];
+ sprintf(msg, "%s%s%s%s%s%s%s", msg1, f, msg2, p1, msg3, p2, msg4);
+ exit_err(rename(p1, p2), msg);
+}
+
+
+
+extern uint16_t textfile_sizes(FILE * file, uint16_t * n_lines_p)
+{
+ char * f_name = "textfile_sizes()";
+ int c = 0;
+ uint16_t c_count = 0;
+ uint16_t n_lines = 0;
+ uint16_t linemax = 0;
+ while (1)
+ {
+ c = try_fgetc(file, f_name);
+ if (EOF == c)
+ {
+ break;
+ }
+ c_count++;
+ if ('\n' == c)
+ {
+ if (c_count > linemax)
+ {
+ linemax = c_count;
+ }
+ c_count = 0;
+ if (n_lines_p)
+ {
+ n_lines++;
+ }
+ }
+ }
+ if (0 == linemax && 0 < c_count) /* Handle files that consist of only one */
+ { /* line / lack newline chars. */
+ linemax = c_count;
+ }
+ exit_trouble(-1 == fseek(file, 0, SEEK_SET), f_name, "fseek()");
+ if (n_lines_p)
+ {
+ * n_lines_p = n_lines;
+ }
+ return linemax;
+}
+
+
+
+extern uint32_t read_uint32_bigendian(FILE * file)
+{
+ char * f_name = "read_uint32_bigendian()";
+ uint32_t x;
+ x = (uint32_t) try_fgetc_noeof(file, f_name) << 24;
+ x = x + ( (uint32_t) try_fgetc_noeof(file, f_name) << 16 );
+ x = x + ( (uint32_t) try_fgetc_noeof(file, f_name) << 8 );
+ x = x + (uint32_t) try_fgetc_noeof(file, f_name);
+ return x;
+}
+
+
+
+extern void write_uint32_bigendian(uint32_t x, FILE * file)
+{
+ 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);
+}
projects / plomrogue / blobdiff