X-Git-Url: https://plomlompom.com/repos/foo.html?a=blobdiff_plain;f=src%2Freadwrite.c;h=06a63448cc9d157974e07140a5d8ad2f2710215a;hb=10680a2398daf76e6a0cd261c2b247e6902f2ad0;hp=30c99ab4f31d4f551a203b52f07104ba5ca74e2b;hpb=74125940ffac4a7bc38d0cde2d530679a77f7368;p=plomrogue
diff --git a/src/readwrite.c b/src/readwrite.c
index 30c99ab..06a6344 100644
--- a/src/readwrite.c
+++ b/src/readwrite.c
@@ -1,110 +1,170 @@
/* readwrite.c */
#include "readwrite.h"
-#include /* for FILE typedef*/
+#include /* for FILE typedef, fopen(), fgetc(), fputc(), fseek(),
+ * sprintf(), fwrite(), ferror()
+ */
#include /* for uint8_t, uint16_t, uint32_t */
+#include /* for strlen() */
+#include /* for unlink() */
+#include "rexit.h" /* for exit_err(), exit_trouble() */
+#include "main.h" /* for world global */
-/* Read/write "x" from/to "file" as bigendian representation of "size" bits. On
- * 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:
- *
- * if (0 != size && size <= 32 && 0 != size % 8)
- * {
- * return 1;
- * }
- */
-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, 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;
+}
-static uint8_t read_uintX_bigendian(FILE * file, uint32_t * x, uint8_t size)
+
+extern void try_fclose(FILE * file, char * f)
{
- * x = 0;
- int16_t bitshift = size - 8;
- int test;
- for (; bitshift >= 0; bitshift = bitshift - 8)
- {
- test = fgetc(file);
- if (EOF == test)
- {
- return 1;
- }
- * x = * x + ((uint32_t) test << bitshift);
- }
- return 0;
+ exit_trouble(fclose(file), f, "fclose()");
}
-static uint8_t write_uintX_bigendian(FILE * file, uint32_t x, uint8_t size)
+extern void try_fwrite(void * ptr, size_t size, size_t nmemb, FILE * stream,
+ char * f)
{
- int16_t bitshift = size - 8;
- for (; bitshift >= 0; bitshift = bitshift - 8)
- {
- if (EOF == fputc((x >> bitshift) & 0xFF, file))
- {
- return 1;
- }
- }
- return 0;
+ 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 uint8_t read_uint8(FILE * file, uint8_t * x)
+extern char * try_fgets(char * line, int linemax, FILE * file, char * f)
{
- /* Since read_uintX_bigendian() works on -- and zeroes -- four bytes, direct
- * work on values of fewer bytes would corrupt immediate neighbor values.
- */
- uint32_t y = * x;
- uint8_t err = read_uintX_bigendian(file, &y, 8);
- * x = (uint8_t) y;
- return err;
+ char * test = fgets(line, linemax, file);
+ exit_trouble(NULL == test && ferror(file), f, "fgets()");
+ return test;
}
-extern uint8_t read_uint16_bigendian(FILE * file, uint16_t * x)
+extern int try_fgetc(FILE * file, char * f)
{
- /* See read_uint8() introductory code comment for rationale. */
- uint32_t y = * x;
- uint8_t err = read_uintX_bigendian(file, &y, 16);
- * x = (uint16_t) y;
- return err;
+ int test = fgetc(file);
+ exit_trouble(EOF == test && ferror(file), f, "fgetc()");
+ return test;
}
-extern uint8_t read_uint32_bigendian(FILE * file, uint32_t * x)
+extern uint8_t try_fgetc_noeof(FILE * file, char * f)
{
- return read_uintX_bigendian(file, x, 32);
+ char * f_name = "try_fgetc_noeof()";
+ int test = try_fgetc(file, f_name);
+ exit_trouble(EOF == test, f, "fgetc() unexpectedly hitting EOF");
+ return (uint8_t) test;
}
-extern uint8_t write_uint8(uint8_t x, FILE * file)
+extern void try_fclose_unlink_rename(FILE * file, char * p1, char * p2,
+ char * f)
{
- return write_uintX_bigendian(file, x, 8);
+ 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 textfile_sizes(FILE * file, uint16_t * n_lines_p)
+{
+ char * f_name = "textfile_sizes()";
+ int c = 0;
+ uint16_t c_count = 0;
+ uint16_t n_lines = 0;
+ uint16_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;
}
-extern uint8_t write_uint16_bigendian(uint16_t x, FILE * file)
+extern uint32_t read_uint32_bigendian(FILE * file)
{
- return write_uintX_bigendian(file, x, 16);
+ char * f_name = "read_uint32_bigendian()";
+ uint32_t x;
+ x = (uint32_t) try_fgetc_noeof(file, f_name) << 24;
+ x = x + ( (uint32_t) try_fgetc_noeof(file, f_name) << 16 );
+ x = x + ( (uint32_t) try_fgetc_noeof(file, f_name) << 8 );
+ x = x + (uint32_t) try_fgetc_noeof(file, f_name);
+ return x;
}
-extern uint8_t write_uint32_bigendian(uint32_t x, FILE * file)
+extern void write_uint32_bigendian(uint32_t x, FILE * file)
{
- return write_uintX_bigendian(file, x, 32);
+ char * f_name = "write_uint32_bigendian()";
+ try_fputc( x >> 24, file, f_name);
+ try_fputc( ( x >> 16 ) & 0xFF, file, f_name);
+ try_fputc( ( x >> 8 ) & 0xFF, file, f_name);
+ try_fputc( x & 0xFF, file, f_name);
}