X-Git-Url: https://plomlompom.com/repos/?a=blobdiff_plain;f=src%2Fcommon%2Freadwrite.c;fp=src%2Fcommon%2Freadwrite.c;h=026c9add7aba8e5434f158bb97c765d957d88d55;hb=dd9d65ee727ac7e95801da0f8b5bae7009811802;hp=0000000000000000000000000000000000000000;hpb=c3d87a1dee96775443fdf73c53e1350af7ca5fc2;p=plomrogue

diff --git a/src/common/readwrite.c b/src/common/readwrite.c
new file mode 100644
index 0000000..026c9ad
--- /dev/null
+++ b/src/common/readwrite.c
@@ -0,0 +1,136 @@
+/* src/common/readwrite.c */
+
+#include "readwrite.h"
+#include <stddef.h> /* size_t */
+#include <stdint.h> /* uint8_t, uint16_t, uint32_t */
+#include <stdio.h> /* FILE, fseek(), sprintf(), fgets(), fgetc(), ferror(),
+                    * fputc(), fwrite(), fclose(), fopen()
+                    */
+#include <string.h> /* strlen() */
+#include <unistd.h> /* for access(), unlink() */
+#include "rexit.h" /* exit_err(), exit_trouble() */
+
+
+
+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 int try_fgetc(FILE * file, char * f)
+{
+    int test = fgetc(file);
+    exit_trouble(EOF == test && ferror(file), f, "fgetc()");
+    return test;
+}
+
+
+
+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_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 uint32_t textfile_sizes(FILE * file, uint32_t * n_lines_p)
+{
+    char * f_name = "textfile_sizes()";
+    int c = 0;
+    uint32_t c_count = 0;
+    uint32_t n_lines = 0;
+    uint32_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;
+}