diff options
Diffstat (limited to 'libc/string/strerror.c')
| -rw-r--r-- | libc/string/strerror.c | 43 |
1 files changed, 35 insertions, 8 deletions
diff --git a/libc/string/strerror.c b/libc/string/strerror.c index 3aa8b57e2..36c467ef4 100644 --- a/libc/string/strerror.c +++ b/libc/string/strerror.c @@ -23,13 +23,19 @@ Cambridge, MA 02139, USA. */ * are smaller than the previous functions and don't require static buffers. * Removed dependence on strcat in the process. * - * Also appended a test routine ( -DSTRERROR_TEST ) to allow a quick check + * Also appended a test routine ( -DCHECK_BUF ) to allow a quick check * on the buffer length when the sys_errorlist is modified. + * + * Added the option WANT_ERRORLIST for low-memory applications to omit the + * error message strings and only output the error number. */ +#define WANT_ERRORLIST 1 + #include <stdio.h> #include <string.h> #include <errno.h> + #include <limits.h> #if (INT_MAX >> 31) @@ -39,7 +45,11 @@ Cambridge, MA 02139, USA. */ extern char *__ltostr(char *buf, long uval, int base, int uppercase); +#if WANT_ERRORLIST +static char retbuf[48]; +#else static char retbuf[33]; /* 33 is sufficient for 32 bit ints */ +#endif static const char unknown_error[] = "Unknown Error: errno"; /* = */ /* Return a string descibing the errno code in ERRNUM. @@ -49,10 +59,12 @@ char *strerror(int err) { char *pos; +#if WANT_ERRORLIST if ((err >= 0) && (err < sys_nerr)) { strcpy(retbuf, sys_errlist[err]); return retbuf; } +#endif /* unknown error */ pos = __ltostr(retbuf + sizeof(retbuf) + 1, err, 10, 0) @@ -62,24 +74,39 @@ char *strerror(int err) return pos; } -#if STRERROR_TEST -/* quick way to check for sufficient buffer length */ +#ifdef CHECK_BUF +/* quick way to check buffer length */ #include <stdio.h> #include <stdlib.h> int main(void) { int max = 0; - int i, j; + int j, retcode; char *p; +#if WANT_ERRORLIST + int i; +#endif + + retcode = EXIT_SUCCESS; + +#if WANT_ERRORLIST for ( i=0 ; i < sys_nerr ; i++ ) { j = strlen(sys_errlist[i])+1; if (j > max) max = j; } - printf("max len = %i\n", j); +#endif p = strerror(INT_MIN); - printf("<%s> %d\n", p, strlen(p)+1); - printf("current buffer length is %d\n", sizeof(retbuf)); - return EXIT_SUCCESS; + j = strlen(p)+1; + if (j > max) max = j; + printf("strerror.c - Test of INT_MIN: <%s> %d\n", p, j); + + if (sizeof(retbuf) != max) { + printf("Error: strerror.c - dimension of retbuf should be = %d\n", max); + retcode = EXIT_FAILURE; + } + printf("strerror.c - dimension of retbuf correct at %d\n", max); + + return retcode; } #endif |