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97 lines
2.0 KiB
97 lines
2.0 KiB
9 years ago
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#include "main.h"
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#include "com_fileio.h"
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#include "com_iface.h"
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#include "utils/str_utils.h"
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// Holding fields for ifaces
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ComIface *debug_iface = NULL;
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ComIface *data_iface = NULL;
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// --- File descriptor names ------------------------------
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struct name_fd {
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const char *name;
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const int fd;
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};
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#define NAME_FD_MAP_LEN 1
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/** pre-assigned file descriptors for names */
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static const struct name_fd name_fd_map[NAME_FD_MAP_LEN] = {
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{FNAME_DLNK, FD_DLNK}
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};
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// --- Syscalls -------------------------------------------
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/**
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* @brief Write to a file by file descriptor.
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*
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* @param fd : open file descriptor
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* @param buf : data to write
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* @param len : buffer size
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* @return number of written bytes
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*/
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int _write(int fd, const char *buf, int len)
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{
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switch (fd) {
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case FD_STDOUT: return (int)com_tx_block(debug_iface, buf, (size_t)len);
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case FD_STDERR: return (int)com_tx_block(debug_iface, buf, (size_t)len);
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case FD_DLNK: return (int)com_tx_block(data_iface, buf, (size_t)len);
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default:
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return 0;
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}
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}
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// For some reason, reading does not work.
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#if 0
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/**
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* @brief Read from a file descriptor
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*
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* @param fd : file descriptor
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* @param buf : destination buffer
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* @param len : number of bytes to read
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* @return actual number of read bytes
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*/
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int _read(int fd, char *buf, int len)
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{
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switch (fd) {
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case FD_STDIN: return com_rx_block(debug_iface, buf, len);
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case FD_ESP: return com_rx_block(esp_iface, buf, len);
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default:
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return 0;
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}
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}
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#endif
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/**
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* @brief Open a file by name.
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*
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* This stub is called by newlib when fopen is used.
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* It returns a pre-assigned file descriptor based
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* on the name.
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*
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* @note
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* stdout, stderr, stdin are open implicitly
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*
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* @param name : file name
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* @param flags : file flags (ignored)
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* @return file descriptor
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*/
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int _open(const char *name, int flags, ...)
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{
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(void)flags;
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for (int i = 0; i < NAME_FD_MAP_LEN; i++) {
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if (streq(name_fd_map[i].name, name)) {
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return name_fd_map[i].fd;
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}
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}
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return -1;
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}
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