X-Git-Url: https://plomlompom.com/repos/?a=blobdiff_plain;f=src%2Freadwrite.c;h=657d8173dd674ecfa9528cfce9653ee5dd841449;hb=fb8ddca6abc66eb7e52a007850689309b4cda938;hp=39a7353ee393635d0e765e429bf76a2dccf91f9e;hpb=d3769faedef9c27e85a9f1b7b75635209c55450a;p=plomrogue

diff --git a/src/readwrite.c b/src/readwrite.c
index 39a7353..657d817 100644
--- a/src/readwrite.c
+++ b/src/readwrite.c
@@ -1,8 +1,15 @@
 /* readwrite.c */
 
 #include "readwrite.h"
-#include <stdio.h> /* for FILE typedef*/
+#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() */
+#include "misc.h"   /* for trouble_msg() */
+struct World;
 
 
 
@@ -10,11 +17,11 @@
  * 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 +32,139 @@ 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, struct World * w, 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, w, msg);
+    return file_p;
+}
+
+
+
+extern void try_fclose(FILE * file, struct World * w, char * f)
+{
+    char * msg = trouble_msg(w, f, "fclose()");
+    exit_err(fclose(file), w, msg);
+    free(msg);
+}
+
+
+
+extern char * try_fgets(char * line, int linemax, FILE * file,
+                        struct World * w, char * f)
+{
+    char * msg = trouble_msg(w, f, "fgets()");
+    char * test = fgets(line, linemax, file);
+    exit_err(NULL == test && ferror(file), w, msg);
+    free(msg);
+    return test;
+}
+
+
+
+extern void try_fwrite(void * ptr, size_t size, size_t nmemb, FILE * stream,
+                       struct World * w, char * f)
+{
+    char * msg = trouble_msg(w, f, "fwrite()");
+    exit_err(0 == fwrite(ptr, size, nmemb, stream), w, msg);
+    free(msg);
+}
+
+
+
+extern void try_fclose_unlink_rename(FILE * file, char * p1, char * p2,
+                                     struct World * w, char * f)
+{
+    try_fclose(file, w, 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), w, 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), w, msg);
+}
+
+
+
+extern uint16_t get_linemax(FILE * file, struct World * w, char * f)
+{
+    char * msg = trouble_msg(w, f, "textfile_sizes()");
+    uint16_t linemax;
+    exit_err(textfile_sizes(file, &linemax, NULL), w, msg);
+    free(msg);
+    return linemax;
+}
+
+
+
+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;