tor-commits September 2019

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2044 discussions

[tor/master] test: Use SEVERITY_MASK_IDX() to find the LOG_* mask indexes
by asn＠torproject.org 30 Sep '19

30 Sep '19

commit d30a042fa8348028e0bea6f3e46cba1ffbe5adcc Author: teor <teor(a)torproject.org> Date: Wed Sep 25 16:35:02 2019 +1000 test: Use SEVERITY_MASK_IDX() to find the LOG_* mask indexes In the unit tests and fuzzers. Fixes bug 31334; bugfix on 0.2.5.2-alpha. --- changes/bug31334 | 4 ++++ src/test/fuzz/fuzzing_common.c | 2 +- src/test/test_logging.c | 2 +- src/test/test_options.c | 6 +++--- src/test/testing_common.c | 4 ++-- 5 files changed, 11 insertions(+), 7 deletions(-) diff --git a/changes/bug31334 b/changes/bug31334 new file mode 100644 index 000000000..dfc9cc530 --- /dev/null +++ b/changes/bug31334 @@ -0,0 +1,4 @@ + o Code simplification and refactoring: + - Use SEVERITY_MASK_IDX() to find the LOG_* mask indexes in the unit + tests and fuzzers, rather than using hard-coded values. + Closes ticket 31334. diff --git a/src/test/fuzz/fuzzing_common.c b/src/test/fuzz/fuzzing_common.c index 862acb2b3..e269c36b4 100644 --- a/src/test/fuzz/fuzzing_common.c +++ b/src/test/fuzz/fuzzing_common.c @@ -167,7 +167,7 @@ main(int argc, char **argv) memset(&s, 0, sizeof(s)); set_log_severity_config(loglevel, LOG_ERR, &s); /* ALWAYS log bug warnings. */ - s.masks[LOG_WARN-LOG_ERR] |= LD_BUG; + s.masks[SEVERITY_MASK_IDX(LOG_WARN)] |= LD_BUG; add_stream_log(&s, "", fileno(stdout)); } diff --git a/src/test/test_logging.c b/src/test/test_logging.c index bb7018fe1..203ce64e3 100644 --- a/src/test/test_logging.c +++ b/src/test/test_logging.c @@ -35,7 +35,7 @@ test_get_sigsafe_err_fds(void *arg) set_log_severity_config(LOG_WARN, LOG_ERR, &include_bug); set_log_severity_config(LOG_WARN, LOG_ERR, &no_bug); - no_bug.masks[0] &= ~(LD_BUG|LD_GENERAL); + no_bug.masks[SEVERITY_MASK_IDX(LOG_ERR)] &= ~(LD_BUG|LD_GENERAL); set_log_severity_config(LOG_INFO, LOG_NOTICE, &no_bug2); /* Add some logs; make sure the output is as expected. */ diff --git a/src/test/test_options.c b/src/test/test_options.c index 0747a2e06..b3654ede7 100644 --- a/src/test/test_options.c +++ b/src/test/test_options.c @@ -54,9 +54,9 @@ setup_log_callback(void) { log_severity_list_t lst; memset(&lst, 0, sizeof(lst)); - lst.masks[LOG_ERR - LOG_ERR] = ~0; - lst.masks[LOG_WARN - LOG_ERR] = ~0; - lst.masks[LOG_NOTICE - LOG_ERR] = ~0; + lst.masks[SEVERITY_MASK_IDX(LOG_ERR)] = ~0; + lst.masks[SEVERITY_MASK_IDX(LOG_WARN)] = ~0; + lst.masks[SEVERITY_MASK_IDX(LOG_NOTICE)] = ~0; add_callback_log(&lst, log_cback); mark_logs_temp(); } diff --git a/src/test/testing_common.c b/src/test/testing_common.c index ad22898ce..9e7d83dcd 100644 --- a/src/test/testing_common.c +++ b/src/test/testing_common.c @@ -295,7 +295,7 @@ main(int c, const char **v) memset(&s, 0, sizeof(s)); set_log_severity_config(loglevel, LOG_ERR, &s); /* ALWAYS log bug warnings. */ - s.masks[LOG_WARN-LOG_ERR] |= LD_BUG; + s.masks[SEVERITY_MASK_IDX(LOG_WARN)] |= LD_BUG; add_stream_log(&s, "", fileno(stdout)); } { @@ -303,7 +303,7 @@ main(int c, const char **v) log_severity_list_t s; memset(&s, 0, sizeof(s)); set_log_severity_config(LOG_ERR, LOG_ERR, &s); - s.masks[LOG_WARN-LOG_ERR] |= LD_BUG; + s.masks[SEVERITY_MASK_IDX(LOG_WARN)] |= LD_BUG; add_callback_log(&s, log_callback_failure); } flush_log_messages_from_startup();

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[tor/master] Merge branch 'tor-github/pr/1356'
by asn＠torproject.org 30 Sep '19

30 Sep '19

commit fc760c5088394741ac8c83706be6b737aef79beb Merge: 4673cb816 d30a042fa Author: George Kadianakis <desnacked(a)riseup.net> Date: Mon Sep 30 13:47:06 2019 +0300 Merge branch 'tor-github/pr/1356' changes/bug31334 | 4 ++++ src/lib/log/log.c | 4 ---- src/lib/log/log.h | 6 ++++++ src/test/fuzz/fuzzing_common.c | 2 +- src/test/test_logging.c | 2 +- src/test/test_options.c | 6 +++--- src/test/testing_common.c | 4 ++-- 7 files changed, 17 insertions(+), 11 deletions(-)

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[tor/master] log: Move SEVERITY_MASK_IDX() to log.h
by asn＠torproject.org 30 Sep '19

30 Sep '19

commit 1ad1e84b17267f04960b322effaf57ea8a9690c0 Author: teor <teor(a)torproject.org> Date: Mon Aug 5 20:04:08 2019 +1000 log: Move SEVERITY_MASK_IDX() to log.h Move SEVERITY_MASK_IDX() to log.h private/unit tests section, so that we can use it in log.c, the unit tests, and the fuzzers. (The test and fuzzer code changes are in a subsequent commit.) Preparation for bug 31334. --- src/lib/log/log.c | 4 ---- src/lib/log/log.h | 6 ++++++ 2 files changed, 6 insertions(+), 4 deletions(-) diff --git a/src/lib/log/log.c b/src/lib/log/log.c index be6f45955..9373fd404 100644 --- a/src/lib/log/log.c +++ b/src/lib/log/log.c @@ -55,10 +55,6 @@ #include <android/log.h> #endif // HAVE_ANDROID_LOG_H. -/** Given a severity, yields an index into log_severity_list_t.masks to use - * for that severity. */ -#define SEVERITY_MASK_IDX(sev) ((sev) - LOG_ERR) - /** @{ */ /** The string we stick at the end of a log message when it is too long, * and its length. */ diff --git a/src/lib/log/log.h b/src/lib/log/log.h index 4291418eb..da4bcbe60 100644 --- a/src/lib/log/log.h +++ b/src/lib/log/log.h @@ -297,4 +297,10 @@ MOCK_DECL(STATIC void, logv, (int severity, log_domain_mask_t domain, va_list ap) CHECK_PRINTF(5,0)); #endif +#if defined(LOG_PRIVATE) || defined(TOR_UNIT_TESTS) +/** Given a severity, yields an index into log_severity_list_t.masks to use + * for that severity. */ +#define SEVERITY_MASK_IDX(sev) ((sev) - LOG_ERR) +#endif + #endif /* !defined(TOR_TORLOG_H) */

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[tor/master] annotate_ifdef_directives: obey an 80-column line-limit
by asn＠torproject.org 30 Sep '19

30 Sep '19

commit 16890839d35e9ac270e32934a232b45de9e8544b Author: Nick Mathewson <nickm(a)torproject.org> Date: Wed Sep 18 10:51:05 2019 -0400 annotate_ifdef_directives: obey an 80-column line-limit If we would add a comment making a line longer than 80 columns, instead truncate the variable portion of the comment until it just fits into 80 columns, with an ellipsis. --- scripts/maint/annotate_ifdef_directives | 25 ++++++++++++++++++++++--- 1 file changed, 22 insertions(+), 3 deletions(-) diff --git a/scripts/maint/annotate_ifdef_directives b/scripts/maint/annotate_ifdef_directives index fcd96aeb3..b784ca71b 100755 --- a/scripts/maint/annotate_ifdef_directives +++ b/scripts/maint/annotate_ifdef_directives @@ -26,14 +26,33 @@ import re # Any block with fewer than this many lines does not need annotations. LINE_OBVIOUSNESS_LIMIT = 4 +# Maximum line width. +LINE_WIDTH=80 + class Problem(Exception): pass -def commented_line(fmt, argument): +def commented_line(fmt, argument, maxwidth=LINE_WIDTH): """ - Return fmt%argument, for use as a commented line. + Return fmt%argument, for use as a commented line. If the line would + be longer than maxwidth, truncate argument. + + Requires that fmt%"..." will fit into maxwidth characters. """ - return fmt % argument + result = fmt % argument + if len(result) <= maxwidth: + return result + else: + # figure out how much we need to truncate by to fit the argument, + # plus an ellipsis. + ellipsis = "..." + result = fmt % (argument + ellipsis) + overrun = len(result) - maxwidth + truncated_argument = argument[:-overrun] + ellipsis + + result = fmt % truncated_argument + assert len(result) <= maxwidth + return result def uncomment(s): """

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[tor/master] Changes file for 31759 and 31779
by asn＠torproject.org 30 Sep '19

30 Sep '19

commit 3283fd7e79913e25cd5e626d6bb3a12a05b2f3fc Author: Nick Mathewson <nickm(a)torproject.org> Date: Wed Sep 18 11:06:54 2019 -0400 Changes file for 31759 and 31779 --- changes/ticket31759 | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/changes/ticket31759 b/changes/ticket31759 new file mode 100644 index 000000000..f7428f711 --- /dev/null +++ b/changes/ticket31759 @@ -0,0 +1,5 @@ + o Minor features (auto-formatting scripts): + - When annotating C macros, never generate a line that our check-spaces + script would reject. Closes ticket 31759. + - When annotating C macros, try to remove cases of double-negation. + Closes ticket 31779.

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[tor/master] annotate_ifdef_directives: remove some cases of double negation
by asn＠torproject.org 30 Sep '19

30 Sep '19

commit 65e63e746120a03b54de51f1db148a7fa1aa27e2 Author: Nick Mathewson <nickm(a)torproject.org> Date: Wed Sep 18 10:59:35 2019 -0400 annotate_ifdef_directives: remove some cases of double negation This change should reduce the number of cases where we say "/* !(!defined(foo)) */" . This only does cases where we can use a regex to make sure that the simplification is guaranteed to be correct. Full boolean simplification would require this script to parse C, and nobody wants that. --- scripts/maint/annotate_ifdef_directives | 44 +++++++++++++++++++++++++++++++-- 1 file changed, 42 insertions(+), 2 deletions(-) diff --git a/scripts/maint/annotate_ifdef_directives b/scripts/maint/annotate_ifdef_directives index b784ca71b..4463d8382 100755 --- a/scripts/maint/annotate_ifdef_directives +++ b/scripts/maint/annotate_ifdef_directives @@ -54,6 +54,46 @@ def commented_line(fmt, argument, maxwidth=LINE_WIDTH): assert len(result) <= maxwidth return result +def negate(expr): + """Return a negated version of expr; try to avoid double-negation. + + We usually wrap expressions in parentheses and add a "!". + >>> negate("A && B") + '!(A && B)' + + But if we recognize the expression as negated, we can restore it. + >>> negate(negate("A && B")) + 'A && B' + + The same applies for defined(FOO). + >>> negate("defined(FOO)") + '!defined(FOO)' + >>> negate(negate("defined(FOO)")) + 'defined(FOO)' + + Internal parentheses don't confuse us: + >>> negate("!(FOO) && !(BAR)") + '!(!(FOO) && !(BAR))' + + """ + expr = expr.strip() + # See whether we match !(...), with no intervening close-parens. + m = re.match(r'^!\s*$([^$]*)\)$', expr) + if m: + return m.group(1) + + + # See whether we match !?defined(...), with no intervening close-parens. + m = re.match(r'^(!?)\s*(defined$[^$]*\))$', expr) + if m: + if m.group(1) == "!": + prefix = "" + else: + prefix = "!" + return prefix + m.group(2) + + return "!(%s)" % expr + def uncomment(s): """ Remove existing trailing comments from an #else or #endif line. @@ -108,8 +148,8 @@ def translate(f_in, f_out): raise Problem("Unexpected #%s on %d"% (command,lineno)) if (len(cur_level) == 1 and command == 'else' and lineno > cur_level[0][2] + LINE_OBVIOUSNESS_LIMIT): - f_out.write(commented_line("#else /* !(%s) */\n", - cur_level[0][1])) + f_out.write(commented_line("#else /* %s */\n", + negate(cur_level[0][1]))) else: f_out.write(line) cur_level.append((command, rest, lineno))

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[tor/master] Run "make autostyle" with new "annotate_ifdef_directives"
by asn＠torproject.org 30 Sep '19

30 Sep '19

commit 194dbea24d1d05fa7b63b361b06054da4df011b9 Author: Nick Mathewson <nickm(a)torproject.org> Date: Wed Sep 18 11:01:12 2019 -0400 Run "make autostyle" with new "annotate_ifdef_directives" --- src/app/config/config.c | 6 +++--- src/lib/crypt_ops/compat_openssl.h | 2 +- src/lib/fs/dir.c | 2 +- src/lib/log/util_bug.h | 2 +- src/lib/math/fp.c | 2 +- src/lib/memarea/memarea.c | 2 +- src/lib/process/daemon.c | 2 +- src/lib/process/process.c | 2 +- src/lib/process/restrict.c | 2 +- src/lib/process/setuid.c | 2 +- src/lib/tls/tortls_openssl.c | 4 ++-- 11 files changed, 14 insertions(+), 14 deletions(-) diff --git a/src/app/config/config.c b/src/app/config/config.c index bdfa547fd..6ee818ab0 100644 --- a/src/app/config/config.c +++ b/src/app/config/config.c @@ -1455,7 +1455,7 @@ options_act_reversible(const or_options_t *old_options, char **msg) "on this OS/with this build."); goto rollback; } -#else /* !(!defined(HAVE_SYS_UN_H)) */ +#else /* defined(HAVE_SYS_UN_H) */ if (options->ControlSocketsGroupWritable && !options->ControlSocket) { *msg = tor_strdup("Setting ControlSocketGroupWritable without setting" "a ControlSocket makes no sense."); @@ -5101,7 +5101,7 @@ find_torrc_filename(config_line_t *cmd_arg, } else { fname = dflt ? tor_strdup(dflt) : NULL; } -#else /* !(!defined(_WIN32)) */ +#else /* defined(_WIN32) */ fname = dflt ? tor_strdup(dflt) : NULL; #endif /* !defined(_WIN32) */ } @@ -8425,7 +8425,7 @@ init_cookie_authentication(const char *fname, const char *header, log_warn(LD_FS,"Unable to make %s group-readable.", escaped(fname)); } } -#else /* !(!defined(_WIN32)) */ +#else /* defined(_WIN32) */ (void) group_readable; #endif /* !defined(_WIN32) */ diff --git a/src/lib/crypt_ops/compat_openssl.h b/src/lib/crypt_ops/compat_openssl.h index 9c10386c3..61ca51315 100644 --- a/src/lib/crypt_ops/compat_openssl.h +++ b/src/lib/crypt_ops/compat_openssl.h @@ -45,7 +45,7 @@ ((st) == SSL3_ST_SW_SRVR_HELLO_B)) #define OSSL_HANDSHAKE_STATE int #define CONST_IF_OPENSSL_1_1_API -#else /* !(!defined(OPENSSL_1_1_API)) */ +#else /* defined(OPENSSL_1_1_API) */ #define STATE_IS_SW_SERVER_HELLO(st) \ ((st) == TLS_ST_SW_SRVR_HELLO) #define CONST_IF_OPENSSL_1_1_API const diff --git a/src/lib/fs/dir.c b/src/lib/fs/dir.c index 3c31e00d9..291f1bbf0 100644 --- a/src/lib/fs/dir.c +++ b/src/lib/fs/dir.c @@ -262,7 +262,7 @@ check_private_dir,(const char *dirname, cpd_check_t check, } } close(fd); -#else /* !(!defined(_WIN32)) */ +#else /* defined(_WIN32) */ /* Win32 case: we can't open() a directory. */ (void)effective_user; diff --git a/src/lib/log/util_bug.h b/src/lib/log/util_bug.h index 546ae1e3e..d7f01618e 100644 --- a/src/lib/log/util_bug.h +++ b/src/lib/log/util_bug.h @@ -96,7 +96,7 @@ (void)(a); \ (void)(fmt); \ STMT_END -#else /* !(defined(TOR_UNIT_TESTS) && ... */ +#else /* !(defined(TOR_UNIT_TESTS) && defined(DISABLE_ASSERTS_IN_UNIT_TES... */ /** Like assert(3), but send assertion failures to the log as well as to * stderr. */ #define tor_assert(expr) tor_assertf(expr, NULL) diff --git a/src/lib/math/fp.c b/src/lib/math/fp.c index 616e4f15c..49a2a6a2c 100644 --- a/src/lib/math/fp.c +++ b/src/lib/math/fp.c @@ -75,7 +75,7 @@ clamp_double_to_int64(double number) */ #define PROBLEMATIC_FLOAT_CONVERSION_WARNING DISABLE_GCC_WARNING(float-conversion) -#endif /* defined(MINGW_ANY) && GCC_VERSION >= 409 */ +#endif /* (defined(MINGW_ANY)||defined(__FreeBSD__)) && GCC_VERSION >= 409 */ /* With clang 4.0 we apparently run into "double promotion" warnings here, diff --git a/src/lib/memarea/memarea.c b/src/lib/memarea/memarea.c index 84c73b0b9..0a8821090 100644 --- a/src/lib/memarea/memarea.c +++ b/src/lib/memarea/memarea.c @@ -315,7 +315,7 @@ memarea_assert_ok(memarea_t *area) } } -#else /* !(!defined(DISABLE_MEMORY_SENTINELS)) */ +#else /* defined(DISABLE_MEMORY_SENTINELS) */ struct memarea_t { smartlist_t *pieces; diff --git a/src/lib/process/daemon.c b/src/lib/process/daemon.c index 3b90bef67..ae34b5bcb 100644 --- a/src/lib/process/daemon.c +++ b/src/lib/process/daemon.c @@ -165,7 +165,7 @@ finish_daemon(const char *desired_cwd) return 0; } -#else /* !(!defined(_WIN32)) */ +#else /* defined(_WIN32) */ /* defined(_WIN32) */ int start_daemon(void) diff --git a/src/lib/process/process.c b/src/lib/process/process.c index 631c7169f..2194a603f 100644 --- a/src/lib/process/process.c +++ b/src/lib/process/process.c @@ -513,7 +513,7 @@ process_get_unix_process(const process_t *process) tor_assert(process->unix_process); return process->unix_process; } -#else /* !(!defined(_WIN32)) */ +#else /* defined(_WIN32) */ /** Get the internal handle for Windows backend. */ process_win32_t * process_get_win32_process(const process_t *process) diff --git a/src/lib/process/restrict.c b/src/lib/process/restrict.c index 534b39d10..93d06de9a 100644 --- a/src/lib/process/restrict.c +++ b/src/lib/process/restrict.c @@ -214,7 +214,7 @@ set_max_file_descriptors(rlim_t limit, int *max_out) return -1; } limit = MAX_CONNECTIONS; -#else /* !(!defined(HAVE_GETRLIMIT)) */ +#else /* defined(HAVE_GETRLIMIT) */ struct rlimit rlim; if (getrlimit(RLIMIT_NOFILE, &rlim) != 0) { diff --git a/src/lib/process/setuid.c b/src/lib/process/setuid.c index 6e8258f27..e13278794 100644 --- a/src/lib/process/setuid.c +++ b/src/lib/process/setuid.c @@ -376,7 +376,7 @@ switch_id(const char *user, const unsigned flags) #endif /* defined(__linux__) && defined(HAVE_SYS_PRCTL_H) && ... */ return 0; -#else /* !(!defined(_WIN32)) */ +#else /* defined(_WIN32) */ (void)user; (void)flags; diff --git a/src/lib/tls/tortls_openssl.c b/src/lib/tls/tortls_openssl.c index 86f0ac42c..58a7b20de 100644 --- a/src/lib/tls/tortls_openssl.c +++ b/src/lib/tls/tortls_openssl.c @@ -657,7 +657,7 @@ tor_tls_context_new(crypto_pk_t *identity, unsigned int key_lifetime, if (r < 0) goto error; } -#else /* !(defined(SSL_CTX_set1_groups_list) || ...) */ +#else /* !(defined(SSL_CTX_set1_groups_list) || defined(HAVE_SSL_CTX_SET1... */ if (! is_client) { int nid; EC_KEY *ec_key; @@ -673,7 +673,7 @@ tor_tls_context_new(crypto_pk_t *identity, unsigned int key_lifetime, SSL_CTX_set_tmp_ecdh(result->ctx, ec_key); EC_KEY_free(ec_key); } -#endif /* defined(SSL_CTX_set1_groups_list) || ...) */ +#endif /* defined(SSL_CTX_set1_groups_list) || defined(HAVE_SSL_CTX_SET1_... */ SSL_CTX_set_verify(result->ctx, SSL_VERIFY_PEER, always_accept_verify_cb); /* let us realloc bufs that we're writing from */

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[tor/master] annotate_ifdef_directives: clarify situation with newlines
by asn＠torproject.org 30 Sep '19

30 Sep '19

commit 21cc9d13f34d116b521c4415098ca1c9993bd198 Author: Nick Mathewson <nickm(a)torproject.org> Date: Wed Sep 25 21:13:30 2019 -0400 annotate_ifdef_directives: clarify situation with newlines Our line limit is 80 characters, assuming that there is a single terminating newline character that counts towards the limit. On Windows, this might go as high as 81 characters, if we count CRLF as two characters. --- scripts/maint/annotate_ifdef_directives | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/scripts/maint/annotate_ifdef_directives b/scripts/maint/annotate_ifdef_directives index 4463d8382..b6bb147ce 100755 --- a/scripts/maint/annotate_ifdef_directives +++ b/scripts/maint/annotate_ifdef_directives @@ -26,7 +26,10 @@ import re # Any block with fewer than this many lines does not need annotations. LINE_OBVIOUSNESS_LIMIT = 4 -# Maximum line width. +# Maximum line width. This includes a terminating newline character. +# +# (This is the maximum before encoding, so that if the the operating system +# uses multiple characers to encode newline, that's still okay.) LINE_WIDTH=80 class Problem(Exception): @@ -38,7 +41,10 @@ def commented_line(fmt, argument, maxwidth=LINE_WIDTH): be longer than maxwidth, truncate argument. Requires that fmt%"..." will fit into maxwidth characters. + + Requires that fmt ends with a newline. """ + assert fmt.endswith("\n") result = fmt % argument if len(result) <= maxwidth: return result

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[tor/master] annotate_ifdef_directives: generate paren-balanced expressions
by asn＠torproject.org 30 Sep '19

30 Sep '19

commit 195aa2f5f73e0cd9462afd4f21f3f0dac36bbc82 Author: Nick Mathewson <nickm(a)torproject.org> Date: Wed Sep 25 21:27:17 2019 -0400 annotate_ifdef_directives: generate paren-balanced expressions This algorithm is not fully general, but it strikes a balance between efficiency, simplicity, and correctness. --- scripts/maint/annotate_ifdef_directives | 46 +++++++++++++++++++++++++++------ 1 file changed, 38 insertions(+), 8 deletions(-) diff --git a/scripts/maint/annotate_ifdef_directives b/scripts/maint/annotate_ifdef_directives index b6bb147ce..f88dd4fdf 100755 --- a/scripts/maint/annotate_ifdef_directives +++ b/scripts/maint/annotate_ifdef_directives @@ -35,7 +35,41 @@ LINE_WIDTH=80 class Problem(Exception): pass +def close_parens_needed(expr): + """Return the number of left-parentheses needed to make 'expr' + balanced. + """ + return expr.count("(") - expr.count(")") + +def truncate_expression(expr, new_width): + """Given a parenthesized C expression in 'expr', try to return a new + expression that is similar to 'expr', but no more than 'new_width' + characters long. + + Try to return an expression with balanced parentheses. + """ + if len(expr) <= new_width: + # The expression is already short enough. + return expr + + ellipsis = "..." + + # Start this at the minimum that we might truncate. + n_to_remove = len(expr) + len(ellipsis) - new_width + + # Try removing characters, one by one, until we get something where + # re-balancing the parentheses still fits within the limit. + while n_to_remove < len(expr): + truncated = expr[:-n_to_remove] + ellipsis + truncated += ")" * close_parens_needed(truncated) + if len(truncated) <= new_width: + return truncated + n_to_remove += 1 + + return ellipsis + def commented_line(fmt, argument, maxwidth=LINE_WIDTH): + """ Return fmt%argument, for use as a commented line. If the line would be longer than maxwidth, truncate argument. @@ -49,14 +83,10 @@ def commented_line(fmt, argument, maxwidth=LINE_WIDTH): if len(result) <= maxwidth: return result else: - # figure out how much we need to truncate by to fit the argument, - # plus an ellipsis. - ellipsis = "..." - result = fmt % (argument + ellipsis) - overrun = len(result) - maxwidth - truncated_argument = argument[:-overrun] + ellipsis - - result = fmt % truncated_argument + # How long can we let the argument be? Try filling in the + # format with an empty argument to find out. + max_arg_width = maxwidth - len(fmt % "") + result = fmt % truncate_expression(argument, max_arg_width) assert len(result) <= maxwidth return result

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[tor/master] Use Doctests to test the behavior of annotate_ifdef_directives.
by asn＠torproject.org 30 Sep '19

30 Sep '19

commit 6f0e697e4155ca567ddfd46a7f4e7c013287c42a Author: Nick Mathewson <nickm(a)torproject.org> Date: Thu Sep 26 10:03:28 2019 -0400 Use Doctests to test the behavior of annotate_ifdef_directives. --- scripts/maint/annotate_ifdef_directives | 115 ++++++++++++++++++++++++++------ 1 file changed, 94 insertions(+), 21 deletions(-) diff --git a/scripts/maint/annotate_ifdef_directives b/scripts/maint/annotate_ifdef_directives index f88dd4fdf..514b5e58b 100755 --- a/scripts/maint/annotate_ifdef_directives +++ b/scripts/maint/annotate_ifdef_directives @@ -2,24 +2,60 @@ # Copyright (c) 2017-2019, The Tor Project, Inc. # See LICENSE for licensing information -# This script iterates over a list of C files. For each file, it looks at the -# #if/#else C macros, and annotates them with comments explaining what they -# match. -# -# For example, it replaces this: -# -# #ifdef HAVE_OCELOT -# // 500 lines of ocelot code -# #endif -# -# with this: -# -# #ifdef HAVE_OCELOT -# // 500 lines of ocelot code -# #endif /* defined(HAVE_OCELOT) */ -# -# Note that only #else and #endif lines are annotated. Existing comments -# on those lines are removed. +r""" +This script iterates over a list of C files. For each file, it looks at the +#if/#else C macros, and annotates them with comments explaining what they +match. + +For example, it replaces this kind of input... + +>>> INPUT = ''' +... #ifdef HAVE_OCELOT +... C code here +... #if MIMSY == BOROGROVE +... block 1 +... block 1 +... block 1 +... block 1 +... #else +... block 2 +... block 2 +... block 2 +... block 2 +... #endif +... #endif +... ''' + +With this kind of output: +>>> EXPECTED_OUTPUT = ''' +... #ifdef HAVE_OCELOT +... C code here +... #if MIMSY == BOROGROVE +... block 1 +... block 1 +... block 1 +... block 1 +... #else /* !(MIMSY == BOROGROVE) */ +... block 2 +... block 2 +... block 2 +... block 2 +... #endif /* MIMSY == BOROGROVE */ +... #endif /* defined(HAVE_OCELOT) */ +... ''' + +Here's how to use it: +>>> import sys +>>> if sys.version_info.major < 3: from cStringIO import StringIO +>>> if sys.version_info.major >= 3: from io import StringIO + +>>> OUTPUT = StringIO() +>>> translate(StringIO(INPUT), OUTPUT) +>>> assert OUTPUT.getvalue() == EXPECTED_OUTPUT + +Note that only #else and #endif lines are annotated. Existing comments +on those lines are removed. +""" import re @@ -38,6 +74,17 @@ class Problem(Exception): def close_parens_needed(expr): """Return the number of left-parentheses needed to make 'expr' balanced. + + >>> close_parens_needed("1+2") + 0 + >>> close_parens_needed("(1 + 2)") + 0 + >>> close_parens_needed("(1 + 2") + 1 + >>> close_parens_needed("(1 + (2 *") + 2 + >>> close_parens_needed("(1 + (2 * 3) + (4") + 2 """ return expr.count("(") - expr.count(")") @@ -47,6 +94,17 @@ def truncate_expression(expr, new_width): characters long. Try to return an expression with balanced parentheses. + + >>> truncate_expression("1+2+3", 8) + '1+2+3' + >>> truncate_expression("1+2+3+4+5", 8) + '1+2+3...' + >>> truncate_expression("(1+2+3+4)", 8) + '(1+2...)' + >>> truncate_expression("(1+(2+3+4))", 8) + '(1+...)' + >>> truncate_expression("(((((((((", 8) + '((...))' """ if len(expr) <= new_width: # The expression is already short enough. @@ -69,14 +127,23 @@ def truncate_expression(expr, new_width): return ellipsis def commented_line(fmt, argument, maxwidth=LINE_WIDTH): - - """ + # (This is a raw docstring so that our doctests can use \.) + r""" Return fmt%argument, for use as a commented line. If the line would - be longer than maxwidth, truncate argument. + be longer than maxwidth, truncate argument but try to keep its + parentheses balanced. Requires that fmt%"..." will fit into maxwidth characters. Requires that fmt ends with a newline. + + >>> commented_line("/* %s */\n", "hello world", 32) + '/* hello world */\n' + >>> commented_line("/* %s */\n", "hello world", 15) + '/* hello... */\n' + >>> commented_line("#endif /* %s */\n", "((1+2) && defined(FOO))", 32) + '#endif /* ((1+2) && defi...) */\n' + """ assert fmt.endswith("\n") result = fmt % argument @@ -208,6 +275,12 @@ def translate(f_in, f_out): raise Problem("Missing #endif") import sys,os + +if sys.argv[1] == "--self-test": + import doctest + doctest.testmod() + sys.exit(0) + for fn in sys.argv[1:]: with open(fn+"_OUT", 'w') as output_file: translate(open(fn, 'r'), output_file)

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tor-commits September 2019