diff options
Diffstat (limited to 'bsd/freebsd/contrib/ntp/libntp/hextoint.c')
-rwxr-xr-x | bsd/freebsd/contrib/ntp/libntp/hextoint.c | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/bsd/freebsd/contrib/ntp/libntp/hextoint.c b/bsd/freebsd/contrib/ntp/libntp/hextoint.c new file mode 100755 index 0000000..980a43f --- /dev/null +++ b/bsd/freebsd/contrib/ntp/libntp/hextoint.c @@ -0,0 +1,42 @@ +/* + * hextoint - convert an ascii string in hex to an unsigned + * long, with error checking + */ +#include <config.h> +#include <ctype.h> + +#include "ntp_stdlib.h" + +int +hextoint( + const char *str, + u_long *pu + ) +{ + register u_long u; + register const char *cp; + + cp = str; + + if (*cp == '\0') + return 0; + + u = 0; + while (*cp != '\0') { + if (!isxdigit((unsigned char)*cp)) + return 0; + if (u & 0xF0000000) + return 0; /* overflow */ + u <<= 4; + if ('0' <= *cp && *cp <= '9') + u += *cp++ - '0'; + else if ('a' <= *cp && *cp <= 'f') + u += *cp++ - 'a' + 10; + else if ('A' <= *cp && *cp <= 'F') + u += *cp++ - 'A' + 10; + else + return 0; + } + *pu = u; + return 1; +} |