-/* src/common/readwrite.c */
+/* src/common/readwrite.c
+ *
+ * This file is part of PlomRogue. PlomRogue is licensed under the GPL version 3
+ * or any later version. For details on its copyright, license, and warranties,
+ * see the file NOTICE in the root directory of the PlomRogue source package.
+ */
#include "readwrite.h"
-#include <stddef.h> /* size_t */
+#include <stddef.h> /* NULL, size_t */
#include <stdint.h> /* uint8_t, uint16_t, uint32_t, UINT32_MAX */
#include <stdio.h> /* FILE, fseek(), sprintf(), fgets(), fgetc(), ferror(),
* fputc(), fwrite(), fclose(), fopen(), clearerr()
*/
#include <stdlib.h> /* free() */
-#include <string.h> /* strlen() */
+#include <string.h> /* strlen(), memcpy() */
#include <unistd.h> /* access(), unlink() */
#include "rexit.h" /* exit_err(), exit_trouble() */
#include "try_malloc.h" /* try_malloc() */
-/* Return "path" + suffix "_tmp". Value is malloc'd, must be free externally. */
-static char * build_temp_path(char * path);
-
-
-
-static char * build_temp_path(char * path)
-{
- char * suffix_tmp = "_tmp";
- uint16_t size = strlen(path) + strlen(suffix_tmp) + 1;
- char * path_tmp = try_malloc(size, __func__);
- int test = sprintf(path_tmp, "%s%s", path, suffix_tmp);
- exit_trouble(test < 0, __func__, "sprintf");
- return path_tmp;
-}
-
-
-
extern FILE * try_fopen(char * path, char * mode, const char * f)
{
char * msg1 = "Trouble in ";
int test = sprintf(msg, "%s%s%s%s%s%s%s", msg1,f,msg2,mode,msg3,path,msg4);
exit_trouble(test < 0, __func__, "sprintf");
FILE * file_p = fopen(path, mode);
- exit_err(NULL == file_p, msg);
+ exit_err(!file_p, msg);
free(msg);
return file_p;
}
extern char * try_fgets(char * line, int linemax, FILE * file, const char * f)
{
char * test = fgets(line, linemax, file);
- exit_trouble(NULL == test && ferror(file), f, "fgets");
+ exit_trouble(!test && ferror(file), f, "fgets");
return test;
}
+extern char * build_temp_path(char * path)
+{
+ char * suffix_tmp = "_tmp";
+ uint16_t size = strlen(path) + strlen(suffix_tmp) + 1;
+ char * path_tmp = try_malloc(size, __func__);
+ int test = sprintf(path_tmp, "%s%s", path, suffix_tmp);
+ exit_trouble(test < 0, __func__, "sprintf");
+ return path_tmp;
+}
+
+
+
extern FILE * atomic_write_start(char * path, char ** path_tmp)
{
*path_tmp = build_temp_path(path);
exit_trouble(-1 == fseek(file, 0, SEEK_SET), __func__, "fseek");
return linemax;
}
+
+
+
+extern uint8_t read_file_into_queue(FILE * file, char ** queue,
+ uint32_t * queue_size)
+{
+ int test = try_fgetc(file, __func__);
+ if (EOF != test)
+ {
+ char * err_size = "Queue growing too large.";
+ do
+ {
+ char c = (char) test;
+ if ('\n' == c)
+ {
+ c = '\0';
+ }
+ char * new_queue = try_malloc(*queue_size + 1, __func__);
+ memcpy(new_queue, *queue, *queue_size);
+ char * new_pos = new_queue + *queue_size;
+ * new_pos = c;
+ exit_err(*queue_size == UINT32_MAX, err_size);
+ *queue_size = *queue_size + 1;
+ free(*queue);
+ *queue = new_queue;
+ }
+ while (EOF != (test = try_fgetc(file, __func__)));
+ if (*queue_size && '\0' != (*queue)[*queue_size - 1])
+ {
+ char * new_queue = try_malloc(*queue_size + 1, __func__);
+ memcpy(new_queue, *queue, *queue_size);
+ new_queue[*queue_size] = '\0';
+ exit_err(*queue_size == UINT32_MAX, err_size);
+ *queue_size = *queue_size + 1;
+ free(*queue);
+ *queue = new_queue;
+ }
+ return 1;
+ }
+ return 0;
+}
+
+
+
+extern char * get_message_from_queue(char ** queue, uint32_t * queue_size)
+{
+ char * message = NULL;
+ if (*queue_size)
+ {
+ size_t cutout_len = strlen(*queue);
+ uint8_t is_nullbyte_chunk = !cutout_len;
+ if (0 < cutout_len)
+ {
+ cutout_len++;
+ message = try_malloc(cutout_len, __func__);
+ memcpy(message, *queue, cutout_len);
+ }
+ for (;
+ cutout_len != *queue_size && '\0' == (*queue)[cutout_len];
+ cutout_len++);
+ *queue_size = *queue_size - cutout_len;
+ if (0 == *queue_size)
+ {
+ free(*queue); /* NULL so read_file_into_queue() and */
+ *queue = NULL; /* cleanup() may free() this every time, */
+ } /* even when it's un-allocated. */
+ else
+ {
+ char * new_queue = try_malloc(*queue_size, __func__);
+ memcpy(new_queue, &((*queue)[cutout_len]), *queue_size);
+ free(*queue);
+ *queue = new_queue;
+ if (is_nullbyte_chunk)
+ {
+ return get_message_from_queue(queue, queue_size);
+ }
+ }
+ }
+ return message;
+}