diff options
Diffstat (limited to 'toys/echo.c')
| -rw-r--r-- | toys/echo.c | 38 |
1 files changed, 26 insertions, 12 deletions
diff --git a/toys/echo.c b/toys/echo.c index 5feb9899..f7c423cf 100644 --- a/toys/echo.c +++ b/toys/echo.c @@ -17,17 +17,19 @@ config ECHO Write each argument to stdout, with one space between each, followed by a newline. - -n No trailing newline. - -e Process the following escape sequences: - \\ backslash - \a alert (beep/flash) - \b backspace - \c Stop output here (avoids trailing newline) - \f form feed - \n newline - \r carriage return - \t horizontal tab - \v vertical tab + -n No trailing newline. + -e Process the following escape sequences: + \\ backslash + \0NNN octal values (1 to 3 digits) + \a alert (beep/flash) + \b backspace + \c stop output here (avoids trailing newline) + \f form feed + \n newline + \r carriage return + \t horizontal tab + \v vertical tab + \xHH hexadecimal values (1 to 2 digits) */ #include "toys.h" @@ -60,10 +62,22 @@ void echo_main(void) if (found) c = to[found-from]; else if (d == 'c') goto done; else if (d == '0') { + int n = 0; c = 0; - while (arg[j]>='0' && arg[j]<='7') + while (arg[j]>='0' && arg[j]<='7' && n++<3) c = (c*8)+arg[j++]-'0'; } + else if (d == 'x') { + int n = 0; + c = 0; + while (n++<2) + if (arg[j]>='0' && arg[j]<='9') + c = (c*16)+arg[j++]-'0'; + else if (tolower(arg[j])>='a' && tolower(arg[j])<='f') + c = (c*16)+tolower(arg[j++])-'a'+10; + else + break; + } } } xputc(c); |