comparison: docs/Writerside/topics/buffer.h.md
docs/Writerside/topics/buffer.h.md
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- child 1288
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| 13 However, due to the different pointer type, the function pointers do not type check out of the box. | 13 However, due to the different pointer type, the function pointers do not type check out of the box. |
| 14 For convenience, the macros `cxBufferReadFunc` and `cxBufferWriteFunc` are defined, which perform the necessary cast. | 14 For convenience, the macros `cxBufferReadFunc` and `cxBufferWriteFunc` are defined, which perform the necessary cast. |
| 15 | 15 |
| 16 ## Example | 16 ## Example |
| 17 | 17 |
| 18 <warning> | 18 In the following example we use a `CxBuffer`, the `bprintf()` macro from the [UCX printf header](printf.h.md), |
| 19 TODO: add example | 19 and a [UCX map](map.h.md) to create a simple HTTP GET request. |
| 20 </warning> | 20 |
| 21 ```C | |
| 22 #include <cx/buffer.h> | |
| 23 #include <cx/printf.h> | |
| 24 #include <cx/map.h> | |
| 25 | |
| 26 void send_get_request( | |
| 27 void *net_target, | |
| 28 cx_write_func net_write, | |
| 29 const char *host, | |
| 30 const char *path, | |
| 31 CxMap *header | |
| 32 ) { | |
| 33 // initialize buffer and use stack memory for small requests | |
| 34 char stackmem[128]; | |
| 35 CxBuffer buf; | |
| 36 cxBufferInit( | |
| 37 &buf, stackmem, sizeof(stackmem), | |
| 38 cxDefaultAllocator, | |
| 39 CX_BUFFER_COPY_ON_EXTEND // move to heap when request is larger | |
| 40 ); | |
| 41 | |
| 42 // basic request data | |
| 43 cx_bprintf(&buf, "GET %s HTTP/1.1\r\n", path); | |
| 44 cx_bprintf(&buf, "Host: %s\r\n", host); | |
| 45 | |
| 46 // add headers | |
| 47 CxMapIterator iter = cxMapIterator(header); | |
| 48 cx_foreach(CxMapEntry*, entry, iter) { | |
| 49 cxstring name = cx_strn(entry->key->data, entry->key->len); | |
| 50 cx_bprintf(&buf, "%.*s: %s\r\n", | |
| 51 (int) name.length, name.ptr, entry->value | |
| 52 ); | |
| 53 } | |
| 54 | |
| 55 // blank line terminates | |
| 56 cxBufferWrite("\r\n", 1, 2, &buf); | |
| 57 | |
| 58 // write request to the network stream and destroy the buffer | |
| 59 net_write(buf.space, 1, buf.size, net_target); | |
| 60 cxBufferDestroy(&buf); | |
| 61 } | |
| 62 ``` | |
| 21 | 63 |
| 22 ## Create | 64 ## Create |
| 23 | 65 |
| 24 ```C | 66 ```C |
| 25 #include <cx/buffer.h> | 67 #include <cx/buffer.h> |
