docs/examples: adjust prototypes for CURLOPT_READFUNCTION

The type of the buffer in curl_read_callback is 'char *', not 'void *'.

Signed-off-by: Olaf Hering <olaf@aepfle.de>
Closes #6392

tests/libtest/lib1507.c

@@ -35,7 +35,7 @@
 
 #define MULTI_PERFORM_HANG_TIMEOUT 60 * 1000
 
-static size_t read_callback(void *ptr, size_t size, size_t nmemb, void *userp)
+static size_t read_callback(char *ptr, size_t size, size_t nmemb, void *userp)
 {
   (void)ptr;
   (void)size;

tests/libtest/lib1514.c

@@ -35,7 +35,7 @@ struct WriteThis {
   size_t sizeleft;
 };
 
-static size_t read_callback(void *ptr, size_t size, size_t nmemb, void *userp)
+static size_t read_callback(char *ptr, size_t size, size_t nmemb, void *userp)
 {
   struct WriteThis *pooh = (struct WriteThis *)userp;
 
@@ -43,7 +43,7 @@ static size_t read_callback(void *ptr, size_t size, size_t nmemb, void *userp)
     return 0;
 
   if(pooh->sizeleft) {
-    *(char *)ptr = pooh->readptr[0]; /* copy one single byte */
+    *ptr = pooh->readptr[0]; /* copy one single byte */
     pooh->readptr++;                 /* advance pointer */
     pooh->sizeleft--;                /* less data left */
     return 1;                        /* we return 1 byte at a time! */

tests/libtest/lib1517.c

@@ -30,7 +30,7 @@ struct WriteThis {
   size_t sizeleft;
 };
 
-static size_t read_callback(void *ptr, size_t size, size_t nmemb, void *userp)
+static size_t read_callback(char *ptr, size_t size, size_t nmemb, void *userp)
 {
   struct WriteThis *pooh = (struct WriteThis *)userp;
   size_t tocopy = size * nmemb;

tests/libtest/lib1520.c

@@ -47,7 +47,7 @@ struct upload_status {
   int lines_read;
 };
 
-static size_t read_callback(void *ptr, size_t size, size_t nmemb, void *userp)
+static size_t read_callback(char *ptr, size_t size, size_t nmemb, void *userp)
 {
   struct upload_status *upload_ctx = (struct upload_status *)userp;
   const char *data;

tests/libtest/lib1525.c

@@ -32,7 +32,7 @@
 
 static char data [] = "Hello Cloud!\n";
 
-static size_t read_callback(void *ptr, size_t size, size_t nmemb, void *stream)
+static size_t read_callback(char *ptr, size_t size, size_t nmemb, void *stream)
 {
   size_t  amount = nmemb * size; /* Total bytes curl wants */
   if(amount < strlen(data)) {

tests/libtest/lib1526.c

@@ -31,7 +31,7 @@
 
 static char data [] = "Hello Cloud!\n";
 
-static size_t read_callback(void *ptr, size_t size, size_t nmemb, void *stream)
+static size_t read_callback(char *ptr, size_t size, size_t nmemb, void *stream)
 {
   size_t  amount = nmemb * size; /* Total bytes curl wants */
   if(amount < strlen(data)) {

tests/libtest/lib1527.c

@@ -31,7 +31,7 @@
 
 static char data [] = "Hello Cloud!\n";
 
-static size_t read_callback(void *ptr, size_t size, size_t nmemb, void *stream)
+static size_t read_callback(char *ptr, size_t size, size_t nmemb, void *stream)
 {
   size_t  amount = nmemb * size; /* Total bytes curl wants */
   if(amount < strlen(data)) {

tests/libtest/lib1533.c

@@ -48,7 +48,7 @@ static void reset_data(struct cb_data *data, CURL *curl)
 }
 
 
-static size_t read_callback(void *ptr, size_t size, size_t nitems,
+static size_t read_callback(char *ptr, size_t size, size_t nitems,
                             void *userdata)
 {
   struct cb_data *data = (struct cb_data *)userdata;

tests/libtest/lib1591.c

@@ -32,7 +32,7 @@
 static char data [] = "Hello Cloud!\r\n";
 static size_t consumed = 0;
 
-static size_t read_callback(void *ptr, size_t size, size_t nmemb, void *stream)
+static size_t read_callback(char *ptr, size_t size, size_t nmemb, void *stream)
 {
   size_t  amount = nmemb * size; /* Total bytes curl wants */
 

tests/libtest/lib508.c

@@ -30,7 +30,7 @@ struct WriteThis {
   size_t sizeleft;
 };
 
-static size_t read_callback(void *ptr, size_t size, size_t nmemb, void *userp)
+static size_t read_callback(char *ptr, size_t size, size_t nmemb, void *userp)
 {
   struct WriteThis *pooh = (struct WriteThis *)userp;
 
@@ -38,7 +38,7 @@ static size_t read_callback(void *ptr, size_t size, size_t nmemb, void *userp)
     return 0;
 
   if(pooh->sizeleft) {
-    *(char *)ptr = pooh->readptr[0]; /* copy one single byte */
+    *ptr = pooh->readptr[0]; /* copy one single byte */
     pooh->readptr++;                 /* advance pointer */
     pooh->sizeleft--;                /* less data left */
     return 1;                        /* we return 1 byte at a time! */

tests/libtest/lib510.c

@@ -36,7 +36,7 @@ struct WriteThis {
   int counter;
 };
 
-static size_t read_callback(void *ptr, size_t size, size_t nmemb, void *userp)
+static size_t read_callback(char *ptr, size_t size, size_t nmemb, void *userp)
 {
   struct WriteThis *pooh = (struct WriteThis *)userp;
   const char *data;

tests/libtest/lib513.c

@@ -23,7 +23,7 @@
 
 #include "memdebug.h"
 
-static size_t read_callback(void *ptr, size_t size, size_t nmemb, void *userp)
+static size_t read_callback(char *ptr, size_t size, size_t nmemb, void *userp)
 {
   (void)ptr;
   (void)size;

tests/libtest/lib547.c

@@ -38,7 +38,7 @@
 #endif
 
 #ifndef LIB548
-static size_t readcallback(void  *ptr,
+static size_t readcallback(char  *ptr,
                            size_t size,
                            size_t nmemb,
                            void *clientp)

tests/libtest/lib552.c

@@ -127,7 +127,7 @@ static size_t current_offset = 0;
 static char databuf[70000]; /* MUST be more than 64k OR
                                MAX_INITIAL_POST_SIZE */
 
-static size_t read_callback(void *ptr, size_t size, size_t nmemb, void *stream)
+static size_t read_callback(char *ptr, size_t size, size_t nmemb, void *stream)
 {
   size_t  amount = nmemb * size; /* Total bytes curl wants */
   size_t  available = sizeof(databuf) - current_offset; /* What we have to

tests/libtest/lib553.c

@@ -30,7 +30,7 @@
 
 #define POSTLEN 40960
 
-static size_t myreadfunc(void *ptr, size_t size, size_t nmemb, void *stream)
+static size_t myreadfunc(char *ptr, size_t size, size_t nmemb, void *stream)
 {
   static size_t total = POSTLEN;
   static char buf[1024];

tests/libtest/lib554.c

@@ -38,7 +38,7 @@ struct WriteThis {
   size_t sizeleft;
 };
 
-static size_t read_callback(void *ptr, size_t size, size_t nmemb, void *userp)
+static size_t read_callback(char *ptr, size_t size, size_t nmemb, void *userp)
 {
 #ifdef LIB587
   (void)ptr;
@@ -54,7 +54,7 @@ static size_t read_callback(void *ptr, size_t size, size_t nmemb, void *userp)
     return 0;
 
   if(pooh->sizeleft) {
-    *(char *)ptr = pooh->readptr[0]; /* copy one single byte */
+    *ptr = pooh->readptr[0]; /* copy one single byte */
     pooh->readptr++;                 /* advance pointer */
     pooh->sizeleft--;                /* less data left */
     return 1;                        /* we return 1 byte at a time! */

tests/libtest/lib555.c

@@ -45,7 +45,7 @@ static const char uploadthis[] =
   "this is the blurb we want to upload\n";
 #endif
 
-static size_t readcallback(void  *ptr,
+static size_t readcallback(char  *ptr,
                            size_t size,
                            size_t nmemb,
                            void *clientp)

tests/libtest/lib579.c

@@ -64,7 +64,7 @@ static int progress_callback(void *clientp, double dltotal, double dlnow,
   return 0;
 }
 
-static size_t read_callback(void *ptr, size_t size, size_t nmemb, void *userp)
+static size_t read_callback(char *ptr, size_t size, size_t nmemb, void *userp)
 {
   struct WriteThis *pooh = (struct WriteThis *)userp;
   const char *data;