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annotate m4/stpncpy.m4 @ 17252:7a29ec33d6c5

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author Karl Berry <karl@freefriends.org>
date Tue, 01 Jan 2013 09:17:08 -0800
parents e542fd46ad6f
children 344018b6e5d7
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 # stpncpy.m4 serial 16
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Eric Blake <eblake@redhat.com>
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2 dnl Copyright (C) 2002-2003, 2005-2007, 2009-2013 Free Software Foundation,
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3 dnl Inc.
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4 dnl This file is free software; the Free Software Foundation
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5 dnl gives unlimited permission to copy and/or distribute it,
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6 dnl with or without modifications, as long as this notice is preserved.
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7
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8 AC_DEFUN([gl_FUNC_STPNCPY],
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9 [
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10 dnl Persuade glibc <string.h> to declare stpncpy().
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11 AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
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12
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13 dnl The stpncpy() declaration in lib/string.in.h uses 'restrict'.
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14 AC_REQUIRE([AC_C_RESTRICT])
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15
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16 AC_REQUIRE([gl_HEADER_STRING_H_DEFAULTS])
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17
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18 dnl Both glibc and AIX (4.3.3, 5.1) have an stpncpy() function
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19 dnl declared in <string.h>. Its side effects are the same as those
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20 dnl of strncpy():
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21 dnl stpncpy (dest, src, n)
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22 dnl overwrites dest[0..n-1], min(strlen(src),n) bytes coming from src,
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23 dnl and the remaining bytes being NULs. However, the return value is
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24 dnl in glibc: dest + min(strlen(src),n)
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25 dnl in AIX: dest + max(0,n-1)
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26 dnl Only the glibc return value is useful in practice.
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27
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28 AC_CHECK_DECLS_ONCE([stpncpy])
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29 AC_CHECK_FUNCS_ONCE([stpncpy])
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30 if test $ac_cv_func_stpncpy = yes; then
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31 AC_CACHE_CHECK([for working stpncpy], [gl_cv_func_stpncpy], [
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32 AC_RUN_IFELSE(
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33 [AC_LANG_SOURCE([[
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34 #include <stdlib.h>
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35 #include <string.h> /* for strcpy */
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36 /* The stpncpy prototype is missing in <string.h> on AIX 4. */
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37 #if !HAVE_DECL_STPNCPY
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38 extern
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39 # ifdef __cplusplus
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40 "C"
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41 # endif
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42 char *stpncpy (char *dest, const char *src, size_t n);
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43 #endif
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44 int main ()
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45 {
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46 int result = 0;
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47 const char *src = "Hello";
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48 char dest[10];
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49 /* AIX 4.3.3 and AIX 5.1 stpncpy() returns dest+1 here. */
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50 {
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51 strcpy (dest, "\377\377\377\377\377\377");
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52 if (stpncpy (dest, src, 2) != dest + 2)
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53 result |= 1;
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54 }
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55 /* AIX 4.3.3 and AIX 5.1 stpncpy() returns dest+4 here. */
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56 {
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57 strcpy (dest, "\377\377\377\377\377\377");
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58 if (stpncpy (dest, src, 5) != dest + 5)
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59 result |= 2;
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60 }
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61 /* AIX 4.3.3 and AIX 5.1 stpncpy() returns dest+6 here. */
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62 {
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63 strcpy (dest, "\377\377\377\377\377\377");
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64 if (stpncpy (dest, src, 7) != dest + 5)
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65 result |= 4;
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66 }
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67 return result;
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68 }
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69 ]])],
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70 [gl_cv_func_stpncpy=yes],
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71 [gl_cv_func_stpncpy=no],
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72 [AC_EGREP_CPP([Thanks for using GNU], [
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73 #include <features.h>
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74 #ifdef __GNU_LIBRARY__
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75 Thanks for using GNU
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76 #endif
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77 ], [gl_cv_func_stpncpy="guessing yes"], [gl_cv_func_stpncpy="guessing no"])
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78 ])
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79 ])
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80 case "$gl_cv_func_stpncpy" in
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81 *yes)
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82 AC_DEFINE([HAVE_STPNCPY], [1],
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83 [Define if you have the stpncpy() function and it works.])
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84 ;;
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85 *)
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86 REPLACE_STPNCPY=1
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87 ;;
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88 esac
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89 else
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90 HAVE_STPNCPY=0
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91 fi
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92 ])
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93
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94 # Prerequisites of lib/stpncpy.c.
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95 AC_DEFUN([gl_PREREQ_STPNCPY], [
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96 :
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97 ])