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annotate lib/portability.c @ 1327:85f297591693 draft

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Introduce xfork() and make commands use it, and make some WEXITSTATUS() use WIFEXITED() and WTERMSIG()+127.
author Rob Landley <rob@landley.net>
date Sat, 31 May 2014 12:33:24 -0500
parents 786841fdb1e0
children 685a0da6ca59
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1 /* portability.c - code to workaround the deficiencies of various platforms.
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2 *
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3 * Copyright 2012 Rob Landley <rob@landley.net>
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4 * Copyright 2012 Georgi Chorbadzhiyski <gf@unixsol.org>
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5 */
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6
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7 #include "toys.h"
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8
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9 #if defined(__APPLE__) || defined(__ANDROID__)
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10 ssize_t getdelim(char **linep, size_t *np, int delim, FILE *stream)
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11 {
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12 int ch;
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13 size_t new_len;
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14 ssize_t i = 0;
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15 char *line, *new_line;
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16
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17 // Invalid input
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18 if (!linep || !np) {
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19 errno = EINVAL;
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20 return -1;
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21 }
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22
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23 if (*linep == NULL || *np == 0) {
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24 *np = 1024;
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25 *linep = calloc(1, *np);
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26 if (*linep == NULL) return -1;
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27 }
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28 line = *linep;
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29
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30 while ((ch = getc(stream)) != EOF) {
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31 if (i > *np) {
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32 // Need more space
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33 new_len = *np + 1024;
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34 new_line = realloc(*linep, new_len);
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35 if (!new_line) return -1;
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36 *np = new_len;
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37 *linep = new_line;
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38 }
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39
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40 line[i] = ch;
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41 if (ch == delim) break;
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42 i += 1;
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43 }
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45 if (i > *np) {
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46 // Need more space
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47 new_len = i + 2;
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48 new_line = realloc(*linep, new_len);
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49 if (!new_line) return -1;
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50 *np = new_len;
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51 *linep = new_line;
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52 }
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53 line[i + 1] = '\0';
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54
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55 return i > 0 ? i : -1;
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56 }
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57
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58 ssize_t getline(char **linep, size_t *np, FILE *stream)
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59 {
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60 return getdelim(linep, np, '\n', stream);
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61 }
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62 #endif
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63
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64 #if defined(__APPLE__)
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65 extern char **environ;
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66
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67 int clearenv(void)
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68 {
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69 *environ = NULL;
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70 return 0;
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71 }
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72 #endif