/*++ /* NAME /* allascii 3 /* SUMMARY /* predicate if string is all ASCII /* SYNOPSIS /* #include <stringops.h> /* /* int allascii(buffer) /* const char *buffer; /* /* int allascii_len(buffer, len) /* const char *buffer; /* ssize_t len; /* DESCRIPTION /* allascii() determines if its argument is an all-ASCII string. /* /* Arguments: /* .IP buffer /* The null-terminated input string. /* .IP len /* The string length, -1 to determine the length dynamically. /* LICENSE /* .ad /* .fi /* The Secure Mailer license must be distributed with this software. /* AUTHOR(S) /* Wietse Venema /* IBM T.J. Watson Research /* P.O. Box 704 /* Yorktown Heights, NY 10598, USA /*--*/ /* System library. */ #include <sys_defs.h> #include <ctype.h> #include <string.h> /* Utility library. */ #include "stringops.h" /* allascii_len - return true if string is all ASCII */ int allascii_len(const char *string, ssize_t len) { const char *cp; int ch; if (len < 0) len = strlen(string); if (len == 0) return (0); for (cp = string; cp < string + len && (ch = *(unsigned char *) cp) != 0; cp++) if (!ISASCII(ch)) return (0); return (1); }