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author | Paul Eggert <eggert@cs.ucla.edu> | 2004-07-12 18:19:38 +0000 |
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committer | Paul Eggert <eggert@cs.ucla.edu> | 2004-07-12 18:19:38 +0000 |
commit | 92a74b0a8831f74e19dde24ce51a344bb0f75793 (patch) | |
tree | 615f9cc8051b55ea0f080e78c8c3f4ecb10be40a /lib | |
parent | 6301ff874e3dba7c321129cc61e9fa99a09948eb (diff) | |
download | coreutils-92a74b0a8831f74e19dde24ce51a344bb0f75793.tar.xz |
Include <errno.h>, <stdio.h>, <stdlib.h> even
if HAVE_GETLOADAVG is defined, so that the test program can work.
(errno): Remove declaration; not needed in C89 or later.
Include "c-strtod.h".
Do not include locale.h or define setlocale; no longer needed.
Include <limits.h>.
(INT_STRLEN_BOUND): New macro.
(getloadavg): Use it to compute buffer size.
Don't assume that buffer will be properly terminated by 'read'.
Use c_strtod instead of setlocale.
(main) [defined TEST]: Return int, not void.
Diffstat (limited to 'lib')
-rw-r--r-- | lib/getloadavg.c | 93 |
1 files changed, 41 insertions, 52 deletions
diff --git a/lib/getloadavg.c b/lib/getloadavg.c index ab10adae9..0a338670a 100644 --- a/lib/getloadavg.c +++ b/lib/getloadavg.c @@ -48,8 +48,6 @@ not an array. HAVE_STRUCT_NLIST_N_UN_N_NAME `n_un.n_name' is member of `struct nlist'. LINUX_LDAV_FILE [__linux__]: File containing load averages. - HAVE_LOCALE_H locale.h is available. - HAVE_SETLOCALE The `setlocale' function is available. Specific system predefines this file uses, aside from setting default values if not emacs: @@ -85,39 +83,27 @@ # include <config.h> #endif -#include <sys/types.h> - -/* Both the Emacs and non-Emacs sections want this. Some - configuration files' definitions for the LOAD_AVE_CVT macro (like - sparc.h's) use macros like FSCALE, defined here. */ -#if defined (unix) || defined (__unix) -# include <sys/param.h> -#endif - +#include <errno.h> +#include <stdio.h> +#include <stdlib.h> /* Exclude all the code except the test program at the end - if the system has its own `getloadavg' function. - - The declaration of `errno' is needed by the test program - as well as the function itself, so it comes first. */ + if the system has its own `getloadavg' function. */ -#include <errno.h> +#ifndef HAVE_GETLOADAVG -#ifndef errno -extern int errno; -#endif +# include <sys/types.h> -#ifdef HAVE_LOCALE_H -# include <locale.h> -#endif -#ifndef HAVE_SETLOCALE -# define setlocale(Category, Locale) ((char *) NULL) -#endif - -#include "cloexec.h" -#include "xalloc.h" +/* Both the Emacs and non-Emacs sections want this. Some + configuration files' definitions for the LOAD_AVE_CVT macro (like + sparc.h's) use macros like FSCALE, defined here. */ +# if defined (unix) || defined (__unix) +# include <sys/param.h> +# endif -#ifndef HAVE_GETLOADAVG +# include "c-strtod.h" +# include "cloexec.h" +# include "xalloc.h" /* The existing Emacs configuration files define a macro called LOAD_AVE_CVT, which accepts a value of type LOAD_AVE_TYPE, and @@ -362,7 +348,7 @@ extern int errno; # include <unistd.h> # endif -# include <stdio.h> +# include <limits.h> /* LOAD_AVE_TYPE should only get defined if we're going to use the nlist method. */ @@ -436,7 +422,6 @@ extern int errno; # endif /* sgi */ # ifdef UMAX -# include <stdio.h> # include <signal.h> # include <sys/time.h> # include <sys/wait.h> @@ -592,33 +577,37 @@ getloadavg (double loadavg[], int nelem) # define LINUX_LDAV_FILE "/proc/loadavg" # endif - char ldavgbuf[40]; - double load_ave[3]; +/* Upper bound on the string length of an integer converted to string. + 302 / 1000 is ceil (log10 (2.0)). Subtract 1 for the sign bit; + add 1 for integer division truncation; add 1 more for a minus sign. */ +# define INT_STRLEN_BOUND(t) ((sizeof (t) * CHAR_BIT - 1) * 302 / 1000 + 2) + + char ldavgbuf[3 * (INT_STRLEN_BOUND (long int) + sizeof ".00")]; + char const *ptr = ldavgbuf; int fd, count; - char *old_locale; fd = open (LINUX_LDAV_FILE, O_RDONLY); if (fd == -1) return -1; - count = read (fd, ldavgbuf, 40); + count = read (fd, ldavgbuf, sizeof ldavgbuf - 1); (void) close (fd); if (count <= 0) return -1; + ldavgbuf[count] = '\0'; - /* The following sscanf must use the C locale. */ - old_locale = setlocale (LC_NUMERIC, NULL); - if (old_locale) - old_locale = xstrdup (old_locale); - setlocale (LC_NUMERIC, "C"); - count = sscanf (ldavgbuf, "%lf %lf %lf", - &load_ave[0], &load_ave[1], &load_ave[2]); - setlocale (LC_NUMERIC, old_locale); - free (old_locale); - if (count < 1) - return -1; - - for (elem = 0; elem < nelem && elem < count; elem++) - loadavg[elem] = load_ave[elem]; + for (elem = 0; elem < nelem; elem++) + { + char *endptr; + double d = c_strtod (ptr, &endptr); + if (ptr == endptr) + { + if (elem == 0) + return -1; + break; + } + loadavg[elem] = d; + ptr = endptr; + } return elem; @@ -999,7 +988,7 @@ getloadavg (double loadavg[], int nelem) #endif /* ! HAVE_GETLOADAVG */ #ifdef TEST -void +int main (int argc, char **argv) { int naptime = 0; @@ -1017,7 +1006,7 @@ main (int argc, char **argv) if (loads == -1) { perror ("Error getting load average"); - exit (1); + return EXIT_FAILURE; } if (loads > 0) printf ("1-minute: %f ", avg[0]); @@ -1033,6 +1022,6 @@ main (int argc, char **argv) sleep (naptime); } - exit (0); + return EXIT_SUCCESS; } #endif /* TEST */ |