diff options
Diffstat (limited to 'toys/echo.c')
| -rw-r--r-- | toys/echo.c | 74 |
1 files changed, 36 insertions, 38 deletions
diff --git a/toys/echo.c b/toys/echo.c index 6430dcbf..de4be54b 100644 --- a/toys/echo.c +++ b/toys/echo.c @@ -36,56 +36,54 @@ config ECHO void echo_main(void) { - int i = 0; - char *arg, *from = "\\abfnrtv", *to = "\\\a\b\f\n\r\t\v"; + int i = 0, out; + char *arg, *from = "\\abfnrtv", *to = "\\\a\b\f\n\r\t\v", *c; for (;;) { arg = toys.optargs[i]; if (!arg) break; if (i++) xputc(' '); - // Handle -e + // Should we output arg verbatim? + + if (!(toys.optflags&2)) { + xprintf("%s", arg); + continue; + } - if (toys.optflags&2) { - int c, j = 0; - for (;;) { - c = arg[j++]; - if (!c) break; - if (c == '\\') { - char *found; - int d = arg[j++]; + // Handle -e - // handle \escapes + for (c=arg;;) { + if (!(out = *(c++))) break; - if (d) { - found = strchr(from, d); - 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' && 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 { - int temp = tolower(arg[j]); - if (temp>='a' && temp<='f') { - c = (c*16)+temp-'a'+10; - j++; - } else break; - } - } + // handle \escapes + if (out == '\\' && *c) { + int n = 0, slash = *(c++); + char *found = strchr(from, slash); + if (found) out = to[found-from]; + else if (slash == 'c') goto done; + else if (slash == '0') { + out = 0; + while (*c>='0' && *c<='7' && n++<3) + out = (out*8)+*(c++)-'0'; + } else if (slash == 'x') { + out = 0; + while (n++<2) { + if (*c>='0' && *c<='9') + out = (out*16)+*(c++)-'0'; + else { + int temp = tolower(*c); + if (temp>='a' && temp<='f') { + out = (out*16)+temp-'a'+10; + c++; + } else break; } } - } - xputc(c); + // Slash in front of unknown character, print literal. + } else c--; } - } else xprintf("%s", arg); + xputc(out); + } } // Output "\n" if no -n |