diff options
Diffstat (limited to 'libc/string/strsignal.c')
| -rw-r--r-- | libc/string/strsignal.c | 73 |
1 files changed, 50 insertions, 23 deletions
diff --git a/libc/string/strsignal.c b/libc/string/strsignal.c index 1a0a6ca47..60acc65b0 100644 --- a/libc/string/strsignal.c +++ b/libc/string/strsignal.c @@ -14,16 +14,31 @@ * Also fixed a bug in the signal name lookup code. While the table is * declared with dimension > 60, there are currently on 32 signals listed. * - * Also appended a test routine ( -DSTRSIGNAL_TEST ) to allow a quick check - * on the buffer length when the sys_errorlist is modified. + * Also appended a test routine ( -DCHECK_BUF ) to allow a quick check + * on the buffer length and the number of known signals when the sys_errorlist + * is modified. + * + * Added the option WANT_SIGLIST for low-memory applications to omit the + * signal message strings and only output the signal number. */ +#define WANT_SIGLIST 1 + #include <string.h> #include <malloc.h> #include <signal.h> +#include <limits.h> + +#if (INT_MAX >> 31) +/* We're set up for 32 bit ints */ +#error need to check size allocation for static buffer 'retbuf' +#endif + extern char *__ltostr(char *buf, long uval, int base, int uppercase); +#if WANT_SIGLIST + const char *const sys_siglist[] = { "Unknown signal", "Hangup", @@ -60,26 +75,27 @@ const char *const sys_siglist[] = { NULL }; -#include <limits.h> - -#if (INT_MAX >> 31) -/* We're set up for 32 bit ints */ -#error need to check size allocation for static buffer 'retbuf' #endif +#define NUM_KNOWN_SIGNALS 32 + /********************** Function strsignal ************************************/ +static char retbuf[28]; /* 28 is sufficient for 32 bit ints */ +static const char unknown_signal[] = "Unknown Signal:"; + char *strsignal(int sig) { - static char retbuf[28]; /* 28 is sufficient for 32 bit ints */ - static const char unknown_signal[] = "Unknown Signal:"; char *pos; +#ifdef WANT_SIGLIST /* if ((sig >= 0) && (sig < _NSIG)) { */ - if ((sig >= 0) && (sig < 32)) { /* WARNING!!! NOT ALL _NSIG DEFINED!!! */ + /* WARNING!!! NOT ALL _NSIG DEFINED!!! */ + if ((sig >= 0) && (sig < NUM_KNOWN_SIGNALS)) { strcpy(retbuf, sys_siglist[sig]); return retbuf; } +#endif pos = __ltostr(retbuf + sizeof(unknown_signal) + 1, sig, 10, 0) - sizeof(unknown_signal); @@ -90,33 +106,44 @@ char *strsignal(int sig) /********************** THE END ********************************************/ -#if STRSIGNAL_TEST +#ifdef CHECK_BUF /* quick way to check for sufficient buffer length */ #include <stdio.h> #include <stdlib.h> int main(void) { int max = 0; - int i, j; + int j, retcode; + const char *p; +#if WANT_SIGLIST + int i; +#endif + retcode = EXIT_SUCCESS; +#if WANT_SIGLIST printf("_NSIG = %d from headers\n", _NSIG); - for ( i=0 ; i < _NSIG ; i++ ) { - p = sys_siglist[i]; - if (!p) { - printf("Warning! I only count %d signals!\n", i); - break; - } + for ( i=0 ; sys_siglist[i] ; i++ ) { j = strlen(sys_siglist[i])+1; if (j > max) max = j; } - printf("max len = %i\n", j); + if (i != NUM_KNOWN_SIGNALS) { + printf("Error: strsignal.c - NUM_KNOWN_SIGNALS should be %d\n", i); + retcode = EXIT_FAILURE; + } +#endif p = strsignal(INT_MIN); - printf("<%s> %d\n", p, strlen(p)+1); + j = strlen(p)+1; + if (j > max) max = j; + printf("strsignal.c - Test of INT_MIN: <%s> %d\n", p, j); + + if (sizeof(retbuf) != max) { + printf("Error: strsignal.c - dimension of retbuf should be = %d\n", max); + retcode = EXIT_FAILURE; + } + printf("strsignal.c - dimension of retbuf correct at %d\n", max); - p = strsignal(i-1); - printf("last signal %d is %s\n", i-1, p); - return EXIT_SUCCESS; + return retcode; } #endif |