X-Git-Url: https://plomlompom.com/repos/?a=blobdiff_plain;f=src%2Freadwrite.c;h=96505adf4387cc52f4a83241f03098869b0a67d9;hb=0e6c855b67e0cd3def7196396f3d1f45ff85b692;hp=39a7353ee393635d0e765e429bf76a2dccf91f9e;hpb=d3769faedef9c27e85a9f1b7b75635209c55450a;p=plomrogue

diff --git a/src/readwrite.c b/src/readwrite.c
index 39a7353..96505ad 100644
--- a/src/readwrite.c
+++ b/src/readwrite.c
@@ -1,7 +1,7 @@
 /* readwrite.c */
 
 #include "readwrite.h"
-#include <stdio.h> /* for FILE typedef*/
+#include <stdio.h> /* for FILE typedef, fgetc(), fputc(), fseek() */
 #include <stdint.h> /* for uint8_t, uint16_t, uint32_t */
 
 
@@ -10,11 +10,11 @@
  * 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". Originally a bit
- * number check prefaced the code of both functions. It was removed as redundant
- * due to all possible "size" values being hardcoded into the library (i.e. in
- * all extern functions calling / wrapping around either function). If this ever
- * changes, (re-)insert:
+ * Only use multiples of 8 greater or equal 32 for "size", so that storage
+ * inside uint32_t is possible. Originally a bit number check prefaced the code
+ * of both functions. It was removed as redundant due to all possible "size"
+ * values being hardcoded into the library (i.e. in all extern functions calling
+ * / wrapping around either function). If this ever changes, (re-)insert:
  *
  *    if (0 == size || size > 32 || 0 != size % 8)
  *    {
@@ -25,6 +25,54 @@ 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 uint8_t textfile_sizes(FILE * file, uint16_t * linemax_p,
+                              uint16_t * n_lines_p)
+{
+    int c = 0;
+    uint16_t c_count = 0;
+    uint16_t n_lines = 0;
+    uint16_t linemax = 0;
+    while (1)
+    {
+        c = fgetc(file);
+        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;
+    }
+
+    if (-1 == fseek(file, 0, SEEK_SET))
+    {
+        return 1;
+    }
+    * linemax_p = linemax;
+    if (n_lines_p)
+    {
+        * n_lines_p = n_lines;
+    }
+    return 0;
+}
+
+
+
 static uint8_t read_uintX_bigendian(FILE * file, uint32_t * x, uint8_t size)
 {
     * x = 0;