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annotate src/mygetline.c @ 771:5bab557020a6

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More readable interface to mygetuntil() when reading to EOF
author Ben Schmidt
date Mon, 01 Nov 2010 08:31:08 +1100
parents ecb991e41a4c
children
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1 /* Copyright (C) 2004 Morten K. Poulsen <morten at afdelingp.dk>
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2 * Copyright (C) 2004 Mads Martin Joergensen <mmj at mmj.dk>
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3 *
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4 * $Id$
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5 *
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6 * Permission is hereby granted, free of charge, to any person obtaining a copy
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7 * of this software and associated documentation files (the "Software"), to
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8 * deal in the Software without restriction, including without limitation the
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9 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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10 * sell copies of the Software, and to permit persons to whom the Software is
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11 * furnished to do so, subject to the following conditions:
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12 *
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13 * The above copyright notice and this permission notice shall be included in
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14 * all copies or substantial portions of the Software.
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15 *
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16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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19 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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21 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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22 * IN THE SOFTWARE.
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23 */
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24
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25 #include <stdlib.h>
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26 #include <string.h>
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27 #include <unistd.h>
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28 #include <errno.h>
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29 #include <stdio.h>
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30
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31 #include "mygetline.h"
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32 #include "memory.h"
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33
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34 static char *mygetuntil(int fd, int eof)
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35 {
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36 size_t i = 0, res, buf_size = BUFSIZE; /* initial buffer size */
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37 char *buf, ch;
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38
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39 buf = mymalloc(buf_size);
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40 buf[0] = '\0';
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41 while(1) {
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42 res = read(fd, &ch, 1);
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43 if(res < 0) {
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44 if(errno == EINTR)
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45 continue;
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46 else {
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47 myfree(buf);
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48 return NULL;
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49 }
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50 }
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51 if(res == 0) {
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52 if(buf[0]) {
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53 buf[i] = '\0';
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54 return buf;
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55 } else {
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56 myfree(buf);
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57 return NULL;
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58 }
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59 }
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60
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61 if(i == buf_size - 1) {
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62 buf_size *= 2;
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63 buf = myrealloc(buf, buf_size);
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64 }
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65 buf[i++] = ch;
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66 if(eof != EOF && ch == eof) {
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67 buf[i] = '\0';
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68 return buf;
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69 }
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70 }
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71 }
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72
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73 char *mygetline(int fd)
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74 {
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75 return mygetuntil(fd, '\n');
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76 }
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77
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78 char *mygetcontent(int fd)
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79 {
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80 return mygetuntil(fd, EOF);
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81 }