write_file()/read_file() functions added

They are not used now, but they are very helpful for debugging and they
will be used in future examples.

Change-Id: Ia3cee5a67013543096cef45b04b649ce5faaf9e8

diff --git a/examples/misc.c b/examples/misc.c
index bd951e9..b3a8fdc 100644 (file)
--- a/examples/misc.c
+++ b/examples/misc.c
@@ -1,5 +1,8 @@
 #include <stdio.h>
 #include <stdarg.h>
+#include <string.h>
+
+#include <yaca/crypto.h>
 
 #include <openssl/bio.h>
 #include "misc.h"
@@ -19,3 +22,84 @@ void debug_func(const char* buf)
 {
        puts(buf);
 }
+
+int write_file(const char *path, char *data, size_t data_len)
+{
+       size_t written = 0;
+       FILE *f;
+
+       f = fopen(path, "w");
+       if (f == NULL)
+               return -1;
+
+       while (written != data_len) {
+               int ret = fwrite(data + written, 1, data_len - written, f);
+
+               if (ferror(f) != 0) {
+                       fclose(f);
+                       return -1;
+               }
+
+               written += ret;
+       }
+
+       fclose(f);
+       return 0;
+}
+
+#define BUF_SIZE 512
+
+int read_file(const char *path, char **data, size_t *data_len)
+{
+       int ret;
+       char tmp[BUF_SIZE];
+       char *buf = NULL;
+       size_t buf_len;
+       FILE *f;
+
+       f = fopen(path, "r");
+       if (f == NULL)
+               return -1;
+
+       for(;;) {
+               size_t read = fread(tmp, 1, BUF_SIZE, f);
+
+               if (read > 0) {
+                       if (buf == NULL) {
+                               buf = yaca_malloc(read);
+                               if (buf == NULL) {
+                                       ret = -1;
+                                       break;
+                               }
+                               buf_len = 0;
+                       } else {
+                               char *new_buf = yaca_realloc(buf, buf_len + read);
+                               if (new_buf == NULL) {
+                                       ret = -1;
+                                       break;
+                               }
+                               buf = new_buf;
+                       }
+
+                       memcpy(buf + buf_len, tmp, read);
+                       buf_len += read;
+               }
+
+               if (ferror(f) != 0) {
+                       ret = -1;
+                       break;
+               }
+
+               if (feof(f)) {
+                       *data = buf;
+                       *data_len = buf_len;
+                       buf = NULL;
+                       ret = 0;
+                       break;
+               }
+       }
+
+       fclose(f);
+       free(buf);
+       return ret;
+}

diff --git a/examples/misc.h b/examples/misc.h
index a4436f5..7d89758 100644 (file)
--- a/examples/misc.h
+++ b/examples/misc.h
@@ -37,4 +37,8 @@ void dump_hex(const char *buf,
 
 void debug_func(const char* buf);
 
+int write_file(const char *path, char *data, size_t data_len);
+
+int read_file(const char *path, char **data, size_t *data_len);
+
 #endif /* MISC_H */