From 7475fb4bb466ba79df296ba7225f39e3402360da Mon Sep 17 00:00:00 2001
From: "digit@chromium.org"
<digit@chromium.org@4c0a9323-5329-0410-9bdc-e9ce6186880e>
Date: Wed, 1 Aug 2012 17:37:44 +0000
Subject: [PATCH] Remove some linux libc calls from client library.
This patch removes a few libc calls from the client library
when generating a minidump.
+ Move the static inlined functions from linux_libc_support.h
into their own source file to avoid code duplication.
Tested on linux-x86_64 with 'make check' and 'android/run-checks.sh'
Review URL: https://breakpad.appspot.com/411002
git-svn-id: http://google-breakpad.googlecode.com/svn/trunk@1001 4c0a9323-5329-0410-9bdc-e9ce6186880e
---
src/common/linux/linux_libc_support.cc | 228 +++++++++++++++++++++++++
1 file changed, 228 insertions(+)
create mode 100644 src/common/linux/linux_libc_support.cc
diff --git a/src/common/linux/linux_libc_support.cc b/src/common/linux/linux_libc_support.cc
new file mode 100644
index 00000000..9bf5b02e
--- /dev/null
+++ b/src/common/linux/linux_libc_support.cc
@@ -0,0 +1,228 @@
+// Copyright (c) 2012, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+// * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+// * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+// * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// This source file provides replacements for libc functions that we need. If
+// we call the libc functions directly we risk crashing in the dynamic linker
+// as it tries to resolve uncached PLT entries.
+
+#include "src/common/linux/linux_libc_support.h"
+
+#include <stddef.h>
+
+extern "C" {
+
+size_t my_strlen(const char* s) {
+ size_t len = 0;
+ while (*s++) len++;
+ return len;
+}
+
+int my_strcmp(const char* a, const char* b) {
+ for (;;) {
+ if (*a < *b)
+ return -1;
+ else if (*a > *b)
+ return 1;
+ else if (*a == 0)
+ return 0;
+ a++;
+ b++;
+ }
+}
+
+int my_strncmp(const char* a, const char* b, size_t len) {
+ for (size_t i = 0; i < len; ++i) {
+ if (*a < *b)
+ return -1;
+ else if (*a > *b)
+ return 1;
+ else if (*a == 0)
+ return 0;
+ a++;
+ b++;
+ }
+
+ return 0;
+}
+
+// Parse a non-negative integer.
+// result: (output) the resulting non-negative integer
+// s: a NUL terminated string
+// Return true iff successful.
+bool my_strtoui(int* result, const char* s) {
+ if (*s == 0)
+ return false;
+ int r = 0;
+ for (;; s++) {
+ if (*s == 0)
+ break;
+ const int old_r = r;
+ r *= 10;
+ if (*s < '0' || *s > '9')
+ return false;
+ r += *s - '0';
+ if (r < old_r)
+ return false;
+ }
+
+ *result = r;
+ return true;
+}
+
+// Return the length of the given, non-negative integer when expressed in base
+// 10.
+unsigned my_int_len(intmax_t i) {
+ if (!i)
+ return 1;
+
+ int len = 0;
+ while (i) {
+ len++;
+ i /= 10;
+ }
+
+ return len;
+}
+
+// Convert a non-negative integer to a string
+// output: (output) the resulting string is written here. This buffer must be
+// large enough to hold the resulting string. Call |my_int_len| to get the
+// required length.
+// i: the non-negative integer to serialise.
+// i_len: the length of the integer in base 10 (see |my_int_len|).
+void my_itos(char* output, intmax_t i, unsigned i_len) {
+ for (unsigned index = i_len; index; --index, i /= 10)
+ output[index - 1] = '0' + (i % 10);
+}
+
+const char* my_strchr(const char* haystack, char needle) {
+ while (*haystack && *haystack != needle)
+ haystack++;
+ if (*haystack == needle)
+ return haystack;
+ return (const char*) 0;
+}
+
+const char* my_strrchr(const char* haystack, char needle) {
+ const char* ret = NULL;
+ while (*haystack) {
+ if (*haystack == needle)
+ ret = haystack;
+ haystack++;
+ }
+ return ret;
+}
+
+// Read a hex value
+// result: (output) the resulting value
+// s: a string
+// Returns a pointer to the first invalid charactor.
+const char* my_read_hex_ptr(uintptr_t* result, const char* s) {
+ uintptr_t r = 0;
+
+ for (;; ++s) {
+ if (*s >= '0' && *s <= '9') {
+ r <<= 4;
+ r += *s - '0';
+ } else if (*s >= 'a' && *s <= 'f') {
+ r <<= 4;
+ r += (*s - 'a') + 10;
+ } else if (*s >= 'A' && *s <= 'F') {
+ r <<= 4;
+ r += (*s - 'A') + 10;
+ } else {
+ break;
+ }
+ }
+
+ *result = r;
+ return s;
+}
+
+const char* my_read_decimal_ptr(uintptr_t* result, const char* s) {
+ uintptr_t r = 0;
+
+ for (;; ++s) {
+ if (*s >= '0' && *s <= '9') {
+ r *= 10;
+ r += *s - '0';
+ } else {
+ break;
+ }
+ }
+ *result = r;
+ return s;
+}
+
+void my_memset(void* ip, char c, size_t len) {
+ char* p = (char *) ip;
+ while (len--)
+ *p++ = c;
+}
+
+size_t my_strlcpy(char* s1, const char* s2, size_t len) {
+ size_t pos1 = 0;
+ size_t pos2 = 0;
+
+ while (s2[pos2] != '\0') {
+ if (pos1 + 1 < len) {
+ s1[pos1] = s2[pos2];
+ pos1++;
+ }
+ pos2++;
+ }
+ if (len > 0)
+ s1[pos1] = '\0';
+
+ return pos2;
+}
+
+size_t my_strlcat(char* s1, const char* s2, size_t len) {
+ size_t pos1 = 0;
+
+ while (pos1 < len && s1[pos1] != '\0')
+ pos1++;
+
+ if (pos1 == len)
+ return pos1;
+
+ return pos1 + my_strlcpy(s1 + pos1, s2, len - pos1);
+}
+
+int my_isspace(int ch) {
+ // Matches the C locale.
+ const char spaces[] = " \t\f\n\r\t\v";
+ for (size_t i = 0; i < sizeof(spaces); i++) {
+ if (ch == spaces[i])
+ return 1;
+ }
+ return 0;
+}
+
+} // extern "C"