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This commit introduces version 2.9.7 of the Morse Micro MM-IoT-SDK for ARM microcontroller base platforms.
174 lines
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174 lines
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 <span id="projectnumber">2.9.7</span>
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<div class="headertitle"><div class="title">fileio.c</div></div>
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<a href="fileio_8c.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a id="l00001" name="l00001"></a><span class="lineno"> 1</span><span class="comment">/*</span></div>
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<div class="line"><a id="l00002" name="l00002"></a><span class="lineno"> 2</span><span class="comment"> * Copyright 2023 Morse Micro</span></div>
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<div class="line"><a id="l00003" name="l00003"></a><span class="lineno"> 3</span><span class="comment"> *</span></div>
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<div class="line"><a id="l00004" name="l00004"></a><span class="lineno"> 4</span><span class="comment"> * SPDX-License-Identifier: Apache-2.0</span></div>
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<div class="line"><a id="l00005" name="l00005"></a><span class="lineno"> 5</span><span class="comment"> */</span></div>
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<div class="line"><a id="l00006" name="l00006"></a><span class="lineno"> 6</span> </div>
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<div class="line"><a id="l00028" name="l00028"></a><span class="lineno"> 28</span><span class="preprocessor">#include <stdio.h></span></div>
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<div class="line"><a id="l00029" name="l00029"></a><span class="lineno"> 29</span><span class="preprocessor">#include <sys/unistd.h></span></div>
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<div class="line"><a id="l00030" name="l00030"></a><span class="lineno"> 30</span><span class="preprocessor">#include <sys/fcntl.h></span></div>
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<div class="line"><a id="l00031" name="l00031"></a><span class="lineno"> 31</span><span class="preprocessor">#include <sys/errno.h></span></div>
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<div class="line"><a id="l00032" name="l00032"></a><span class="lineno"> 32</span> </div>
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<div class="line"><a id="l00037" name="l00037"></a><span class="lineno"><a class="line" href="fileio_8c.html#add3190cf715f513666f4be42874d91e2"> 37</a></span><span class="keywordtype">void</span> <a class="code hl_function" href="fileio_8c.html#add3190cf715f513666f4be42874d91e2">app_init</a>(<span class="keywordtype">void</span>)</div>
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<div class="line"><a id="l00038" name="l00038"></a><span class="lineno"> 38</span>{</div>
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<div class="line"><a id="l00039" name="l00039"></a><span class="lineno"> 39</span> printf(<span class="stringliteral">"\n\nFile I/O Example (Built "</span> __DATE__ <span class="stringliteral">" "</span> __TIME__ <span class="stringliteral">")\n\n"</span>);</div>
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<div class="line"><a id="l00040" name="l00040"></a><span class="lineno"> 40</span> </div>
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<div class="line"><a id="l00041" name="l00041"></a><span class="lineno"> 41</span> <span class="comment">/* Open a file for reading - calling open() the first time automatically initializes</span></div>
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<div class="line"><a id="l00042" name="l00042"></a><span class="lineno"> 42</span><span class="comment"> * The file I/O subsystem and links in the required modules. */</span></div>
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<div class="line"><a id="l00043" name="l00043"></a><span class="lineno"> 43</span> <span class="keywordtype">int</span> fd = open(<span class="stringliteral">"test.txt"</span>, O_RDONLY);</div>
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<div class="line"><a id="l00044" name="l00044"></a><span class="lineno"> 44</span> <span class="keywordflow">if</span> (fd < 0)</div>
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<div class="line"><a id="l00045" name="l00045"></a><span class="lineno"> 45</span> {</div>
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<div class="line"><a id="l00046" name="l00046"></a><span class="lineno"> 46</span> <span class="comment">/* We got an error, check for @c EINVAL which signifies File I/O is not supported */</span></div>
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<div class="line"><a id="l00047" name="l00047"></a><span class="lineno"> 47</span> <span class="keywordflow">if</span> (errno == ENOENT)</div>
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<div class="line"><a id="l00048" name="l00048"></a><span class="lineno"> 48</span> {</div>
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<div class="line"><a id="l00049" name="l00049"></a><span class="lineno"> 49</span> <span class="comment">/* We got a file not found error, so simply create the file */</span></div>
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<div class="line"><a id="l00050" name="l00050"></a><span class="lineno"> 50</span> printf(<span class="stringliteral">"File test.txt not found, creating..."</span>);</div>
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<div class="line"><a id="l00051" name="l00051"></a><span class="lineno"> 51</span> fd = open(<span class="stringliteral">"test.txt"</span>, O_RDWR | O_CREAT);</div>
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<div class="line"><a id="l00052" name="l00052"></a><span class="lineno"> 52</span> <span class="keywordflow">if</span> (fd >= 0)</div>
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<div class="line"><a id="l00053" name="l00053"></a><span class="lineno"> 53</span> {</div>
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<div class="line"><a id="l00054" name="l00054"></a><span class="lineno"> 54</span> <span class="keywordtype">char</span> message[] = <span class="stringliteral">"G'day World!\n"</span>;</div>
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<div class="line"><a id="l00055" name="l00055"></a><span class="lineno"> 55</span> <span class="keywordtype">int</span> count = write(fd, message, <span class="keyword">sizeof</span>(message));</div>
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<div class="line"><a id="l00056" name="l00056"></a><span class="lineno"> 56</span> close(fd);</div>
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<div class="line"><a id="l00057" name="l00057"></a><span class="lineno"> 57</span> <span class="keywordflow">if</span> (count >= 0)</div>
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<div class="line"><a id="l00058" name="l00058"></a><span class="lineno"> 58</span> {</div>
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<div class="line"><a id="l00059" name="l00059"></a><span class="lineno"> 59</span> printf(<span class="stringliteral">"%d bytes written!\n"</span></div>
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<div class="line"><a id="l00060" name="l00060"></a><span class="lineno"> 60</span> <span class="stringliteral">"Run application again to see what was written.\n"</span>, count);</div>
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<div class="line"><a id="l00061" name="l00061"></a><span class="lineno"> 61</span> }</div>
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<div class="line"><a id="l00062" name="l00062"></a><span class="lineno"> 62</span> <span class="keywordflow">else</span></div>
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<div class="line"><a id="l00063" name="l00063"></a><span class="lineno"> 63</span> {</div>
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<div class="line"><a id="l00064" name="l00064"></a><span class="lineno"> 64</span> printf(<span class="stringliteral">"Error %d!\n Failed to write to file!\n"</span>, errno);</div>
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<div class="line"><a id="l00065" name="l00065"></a><span class="lineno"> 65</span> }</div>
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<div class="line"><a id="l00066" name="l00066"></a><span class="lineno"> 66</span> }</div>
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<div class="line"><a id="l00067" name="l00067"></a><span class="lineno"> 67</span> <span class="keywordflow">else</span></div>
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<div class="line"><a id="l00068" name="l00068"></a><span class="lineno"> 68</span> {</div>
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<div class="line"><a id="l00069" name="l00069"></a><span class="lineno"> 69</span> printf(<span class="stringliteral">"Failed!\n"</span>);</div>
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<div class="line"><a id="l00070" name="l00070"></a><span class="lineno"> 70</span> }</div>
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<div class="line"><a id="l00071" name="l00071"></a><span class="lineno"> 71</span> }</div>
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<div class="line"><a id="l00072" name="l00072"></a><span class="lineno"> 72</span> <span class="keywordflow">else</span></div>
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<div class="line"><a id="l00073" name="l00073"></a><span class="lineno"> 73</span> {</div>
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<div class="line"><a id="l00074" name="l00074"></a><span class="lineno"> 74</span> printf(<span class="stringliteral">"File I/O is currently not supported on this platform!\n"</span>);</div>
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<div class="line"><a id="l00075" name="l00075"></a><span class="lineno"> 75</span> }</div>
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<div class="line"><a id="l00076" name="l00076"></a><span class="lineno"> 76</span> }</div>
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<div class="line"><a id="l00077" name="l00077"></a><span class="lineno"> 77</span> <span class="keywordflow">else</span></div>
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<div class="line"><a id="l00078" name="l00078"></a><span class="lineno"> 78</span> {</div>
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<div class="line"><a id="l00079" name="l00079"></a><span class="lineno"> 79</span> <span class="comment">/* File successfully opened, read contents */</span></div>
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<div class="line"><a id="l00080" name="l00080"></a><span class="lineno"> 80</span> <span class="keywordtype">char</span> buffer[64];</div>
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<div class="line"><a id="l00081" name="l00081"></a><span class="lineno"> 81</span> <span class="keywordtype">int</span> count = read(fd, buffer, <span class="keyword">sizeof</span>(buffer) - 1);</div>
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<div class="line"><a id="l00082" name="l00082"></a><span class="lineno"> 82</span> close(fd);</div>
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<div class="line"><a id="l00083" name="l00083"></a><span class="lineno"> 83</span> <span class="keywordflow">if</span> (count >= 0)</div>
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<div class="line"><a id="l00084" name="l00084"></a><span class="lineno"> 84</span> {</div>
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<div class="line"><a id="l00085" name="l00085"></a><span class="lineno"> 85</span> <span class="comment">/* Ensure buffer is null terminated */</span></div>
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<div class="line"><a id="l00086" name="l00086"></a><span class="lineno"> 86</span> buffer[count] = 0;</div>
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<div class="line"><a id="l00087" name="l00087"></a><span class="lineno"> 87</span> printf(<span class="stringliteral">"%d bytes read!\nContents: %s\n"</span>, count, buffer);</div>
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<div class="line"><a id="l00088" name="l00088"></a><span class="lineno"> 88</span> }</div>
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<div class="line"><a id="l00089" name="l00089"></a><span class="lineno"> 89</span> <span class="keywordflow">else</span></div>
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<div class="line"><a id="l00090" name="l00090"></a><span class="lineno"> 90</span> {</div>
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<div class="line"><a id="l00091" name="l00091"></a><span class="lineno"> 91</span> printf(<span class="stringliteral">"Error %d!\nFailed to read from file!\n"</span>, errno);</div>
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<div class="line"><a id="l00092" name="l00092"></a><span class="lineno"> 92</span> }</div>
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<div class="line"><a id="l00093" name="l00093"></a><span class="lineno"> 93</span> }</div>
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<div class="line"><a id="l00094" name="l00094"></a><span class="lineno"> 94</span>}</div>
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<div class="ttc" id="afileio_8c_html_add3190cf715f513666f4be42874d91e2"><div class="ttname"><a href="fileio_8c.html#add3190cf715f513666f4be42874d91e2">app_init</a></div><div class="ttdeci">void app_init(void)</div><div class="ttdoc">Main entry point to the application.</div><div class="ttdef"><b>Definition:</b> <a href="fileio_8c_source.html#l00037">fileio.c:37</a></div></div>
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