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annotate lib/portability.c @ 636:42ae383499c5

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Add date -r, make -u work even when /etc/localtime set, and lots of cleanup/refactoring.
author Rob Landley <rob@landley.net>
date Sat, 21 Jul 2012 18:37:26 -0500
parents 1f5bd8c93093
children 786841fdb1e0
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1f5bd8c93093 Implement Apple and Android versions of getline(), getdelim(), and clearenv().
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1 /* vi: set sw=4 ts=4 :*/
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2 /* portability.c - code to workaround the deficiencies of various platforms.
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3 *
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4 * Copyright 2012 Rob Landley <rob@landley.net>
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5 * Copyright 2012 Georgi Chorbadzhiyski <gf@unixsol.org>
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6 */
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7
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8 #include "toys.h"
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9
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10 #if defined(__APPLE__) || defined(__ANDROID__)
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11 ssize_t getdelim(char **linep, size_t *np, int delim, FILE *stream)
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12 {
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13 int ch;
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14 size_t new_len;
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15 ssize_t i = 0;
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16 char *line, *new_line;
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17
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18 // Invalid input
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19 if (!linep || !np) {
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20 errno = EINVAL;
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21 return -1;
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22 }
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23
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24 if (*linep == NULL || *np == 0) {
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25 *np = 1024;
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26 *linep = calloc(1, *np);
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27 if (*linep == NULL)
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28 return -1;
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29 }
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30 line = *linep;
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31
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32 while ((ch = getc(stream)) != EOF) {
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33 if (i > *np) {
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34 // Need more space
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35 new_len = *np + 1024;
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36 new_line = realloc(*linep, new_len);
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37 if (!new_line)
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38 return -1;
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39 *np = new_len;
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40 *linep = new_line;
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41 }
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42
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43 line[i] = ch;
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44 if (ch == delim)
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45 break;
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46 i += 1;
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47 }
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48
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49 if (i > *np) {
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50 // Need more space
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51 new_len = i + 2;
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52 new_line = realloc(*linep, new_len);
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53 if (!new_line)
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54 return -1;
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55 *np = new_len;
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56 *linep = new_line;
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57 }
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58 line[i + 1] = '\0';
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59
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60 return i > 0 ? i : -1;
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61 }
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62
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63 ssize_t getline(char **linep, size_t *np, FILE *stream) {
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64 return getdelim(linep, np, '\n', stream);
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65 }
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66 #endif
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67
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68 #if defined(__APPLE__)
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69 extern char **environ;
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70
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71 int clearenv(void) {
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72 *environ = NULL;
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73 return 0;
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74 }
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75 #endif