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annotate lib/functions.c @ 2:67b517913e56

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Infrastructure, first drop of toy shell, and a bit of work on df.
author landley@driftwood
date Thu, 05 Oct 2006 16:18:03 -0400
parents
children 266a462ed18c
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2
67b517913e56 Infrastructure, first drop of toy shell, and a bit of work on df.
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1 /* vi: set ts=4 :*/
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2 /* functions.c - reusable stuff.
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3 *
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4 * Functions with the x prefix never return failure, they either succeed or
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5 * kill the program with an error message.
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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 // Die with an error message.
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11 void error_exit(char *msg, ...)
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12 {
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13 va_list args;
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14
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15 va_start(args, msg);
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16 fprintf(stderr, "%s: ", toys.which->name);
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17 vfprintf(stderr, msg, args);
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18 va_end(args);
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19 exit(toys.exitval);
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20 }
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21
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22 void strlcpy(char *dest, char *src, size_t size)
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23 {
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24 strncpy(dest,src,size);
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25 dest[size-1] = 0;
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26 }
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27
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28 // Die unless we can allocate memory.
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29 void *xmalloc(size_t size)
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30 {
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31 void *ret = malloc(size);
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32 if (!ret) error_exit("xmalloc");
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33 }
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34
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35 // Die unless we can copy this string.
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36 void *xstrndup(char *s, size_t n)
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37 {
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38 void *ret = xmalloc(++n);
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39 strlcpy(ret, s, n);
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40
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41 return ret;
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42 }
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43
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44 // Die unless we can exec argv[]
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45 void *xexec(char **argv)
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46 {
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47 execvp(argv[0], argv);
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48 error_exit("No %s", argv[0]);
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49 }
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50
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51 // Die unless we can open/create a file, returning file descriptor.
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52 int xopen(char *path, int flags, int mode)
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53 {
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54 int fd = open(path, flags, mode);
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55 if (fd == -1) error_exit("No file %s\n", path);
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56 return fd;
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57 }
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58
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59 // Die unless we can open/create a file, returning FILE *.
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60 FILE *xfopen(char *path, char *mode)
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61 {
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62 FILE *f = fopen(path, mode);
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63 if (!f) error_exit("No file %s\n", path);
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64 return f;
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65 }