+extern void try_fclose(FILE * file, char * f)
+{
+ exit_trouble(fclose(file), f, "fclose()");
+}
+
+
+
+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 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_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 get_linemax(FILE * file, char * f)
+{
+ uint16_t linemax;
+ exit_trouble(textfile_sizes(file, &linemax, NULL), f, "textfile_sizes()");
+ return linemax;
+}
+
+
+
+extern uint8_t textfile_sizes(FILE * file, uint16_t * linemax_p,
+ uint16_t * n_lines_p)