From e9a910b33c7837b4b868e3abda18eb4810df7f02 Mon Sep 17 00:00:00 2001 From: Leah Rowe Date: Sat, 4 Oct 2025 09:14:33 +0100 Subject: config/git: import suckless sbase i currently use the output of sha512sum in several places of xbmk, which is a bit unreliable in case output changes. other cases where i use util outputs in variables are probably reliable, because i'm using mostly posix utilities in those. to mitigate this, i now import suckless sbase, which has a reasonable sha512sum implementation. *every* binary it builds is being placed in build.list, because i'll probably start using more of them. for example, i may start modifying the "date" implementation, adding the GNU-specific options that i need as mentioned on init.sh i'm importing it in util/ because the sha512sum util is needed for verifying project sources, so if sbase itself is a "project source", that means we can into a chicken and egg bootstrapping problem. this is sbase at revision: 055cc1ae1b3a13c3d8f25af0a4a3316590efcd48 Signed-off-by: Leah Rowe --- util/sbase/libutil/unescape.c | 58 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 58 insertions(+) create mode 100644 util/sbase/libutil/unescape.c (limited to 'util/sbase/libutil/unescape.c') diff --git a/util/sbase/libutil/unescape.c b/util/sbase/libutil/unescape.c new file mode 100644 index 00000000..b8f75ca9 --- /dev/null +++ b/util/sbase/libutil/unescape.c @@ -0,0 +1,58 @@ +/* See LICENSE file for copyright and license details. */ +#include +#include + +#include "../util.h" + +#define is_odigit(c) ('0' <= c && c <= '7') + +size_t +unescape(char *s) +{ + static const char escapes[256] = { + ['"'] = '"', + ['\''] = '\'', + ['\\'] = '\\', + ['a'] = '\a', + ['b'] = '\b', + ['E'] = 033, + ['e'] = 033, + ['f'] = '\f', + ['n'] = '\n', + ['r'] = '\r', + ['t'] = '\t', + ['v'] = '\v' + }; + size_t m, q; + char *r, *w; + + for (r = w = s; *r;) { + if (*r != '\\') { + *w++ = *r++; + continue; + } + r++; + if (!*r) { + eprintf("null escape sequence\n"); + } else if (escapes[(unsigned char)*r]) { + *w++ = escapes[(unsigned char)*r++]; + } else if (is_odigit(*r)) { + for (q = 0, m = 3; m && is_odigit(*r); m--, r++) + q = q * 8 + (*r - '0'); + *w++ = MIN(q, 255); + } else if (*r == 'x' && isxdigit(r[1])) { + r++; + for (q = 0, m = 2; m && isxdigit(*r); m--, r++) + if (isdigit(*r)) + q = q * 16 + (*r - '0'); + else + q = q * 16 + (tolower(*r) - 'a' + 10); + *w++ = q; + } else { + eprintf("invalid escape sequence '\\%c'\n", *r); + } + } + *w = '\0'; + + return w - s; +} -- cgit v1.2.1