shared: Introduce new top-level dir and move 1st party lib code there.

This commit moves all first-party code developed for this project from lib/
to shared/, so that lib/ now only contains third-party code.

The following directories are moved as-is from lib to shared:

    lib/libc            -> shared/libc
    lib/memzip          -> shared/memzip
    lib/netutils        -> shared/netutils
    lib/timeutils       -> shared/timeutils
    lib/upytesthelper   -> shared/upytesthelper

All files in lib/embed/ have been moved to shared/libc/.

lib/mp-readline has been moved to shared/readline.

lib/utils has been moved to shared/runtime, with the exception of
lib/utils/printf.c which has been moved to shared/libc/printf.c.

Signed-off-by: Damien George <damien@micropython.org>

1 files changed, 254 insertions, 0 deletions

diff --git a/shared/libc/string0.c b/shared/libc/string0.c
new file mode 100644
index 000000000..19ad14d0f
--- /dev/null
+++ b/shared/libc/string0.c
@@ -0,0 +1,254 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2013, 2014 Damien P. George
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include <stdint.h>
+#include <string.h>
+
+#define likely(x) __builtin_expect((x), 1)
+
+void *memcpy(void *dst, const void *src, size_t n) {
+    if (likely(!(((uintptr_t)dst) & 3) && !(((uintptr_t)src) & 3))) {
+        // pointers aligned
+        uint32_t *d = dst;
+        const uint32_t *s = src;
+
+        // copy words first
+        for (size_t i = (n >> 2); i; i--) {
+            *d++ = *s++;
+        }
+
+        if (n & 2) {
+            // copy half-word
+            *(uint16_t*)d = *(const uint16_t*)s;
+            d = (uint32_t*)((uint16_t*)d + 1);
+            s = (const uint32_t*)((const uint16_t*)s + 1);
+        }
+
+        if (n & 1) {
+            // copy byte
+            *((uint8_t*)d) = *((const uint8_t*)s);
+        }
+    } else {
+        // unaligned access, copy bytes
+        uint8_t *d = dst;
+        const uint8_t *s = src;
+
+        for (; n; n--) {
+            *d++ = *s++;
+        }
+    }
+
+    return dst;
+}
+
+void *memmove(void *dest, const void *src, size_t n) {
+    if (src < dest && (uint8_t*)dest < (const uint8_t*)src + n) {
+        // need to copy backwards
+        uint8_t *d = (uint8_t*)dest + n - 1;
+        const uint8_t *s = (const uint8_t*)src + n - 1;
+        for (; n > 0; n--) {
+            *d-- = *s--;
+        }
+        return dest;
+    } else {
+        // can use normal memcpy
+        return memcpy(dest, src, n);
+    }
+}
+
+void *memset(void *s, int c, size_t n) {
+    if (c == 0 && ((uintptr_t)s & 3) == 0) {
+        // aligned store of 0
+        uint32_t *s32 = s;
+        for (size_t i = n >> 2; i > 0; i--) {
+            *s32++ = 0;
+        }
+        if (n & 2) {
+            *((uint16_t*)s32) = 0;
+            s32 = (uint32_t*)((uint16_t*)s32 + 1);
+        }
+        if (n & 1) {
+            *((uint8_t*)s32) = 0;
+        }
+    } else {
+        uint8_t *s2 = s;
+        for (; n > 0; n--) {
+            *s2++ = c;
+        }
+    }
+    return s;
+}
+
+int memcmp(const void *s1, const void *s2, size_t n) {
+    const uint8_t *s1_8 = s1;
+    const uint8_t *s2_8 = s2;
+    while (n--) {
+        char c1 = *s1_8++;
+        char c2 = *s2_8++;
+        if (c1 < c2) return -1;
+        else if (c1 > c2) return 1;
+    }
+    return 0;
+}
+
+void *memchr(const void *s, int c, size_t n) {
+    if (n != 0) {
+        const unsigned char *p = s;
+
+        do {
+            if (*p++ == c)
+                return ((void *)(p - 1));
+        } while (--n != 0);
+    }
+    return 0;
+}
+
+size_t strlen(const char *str) {
+    int len = 0;
+    for (const char *s = str; *s; s++) {
+        len += 1;
+    }
+    return len;
+}
+
+int strcmp(const char *s1, const char *s2) {
+    while (*s1 && *s2) {
+        char c1 = *s1++; // XXX UTF8 get char, next char
+        char c2 = *s2++; // XXX UTF8 get char, next char
+        if (c1 < c2) return -1;
+        else if (c1 > c2) return 1;
+    }
+    if (*s2) return -1;
+    else if (*s1) return 1;
+    else return 0;
+}
+
+int strncmp(const char *s1, const char *s2, size_t n) {
+    while (*s1 && *s2 && n > 0) {
+        char c1 = *s1++; // XXX UTF8 get char, next char
+        char c2 = *s2++; // XXX UTF8 get char, next char
+        n--;
+        if (c1 < c2) return -1;
+        else if (c1 > c2) return 1;
+    }
+    if (n == 0) return 0;
+    else if (*s2) return -1;
+    else if (*s1) return 1;
+    else return 0;
+}
+
+char *strcpy(char *dest, const char *src) {
+    char *d = dest;
+    while (*src) {
+        *d++ = *src++;
+    }
+    *d = '\0';
+    return dest;
+}
+
+// Public Domain implementation of strncpy from:
+// http://en.wikibooks.org/wiki/C_Programming/Strings#The_strncpy_function
+char *strncpy(char *s1, const char *s2, size_t n) {
+     char *dst = s1;
+     const char *src = s2;
+     /* Copy bytes, one at a time.  */
+     while (n > 0) {
+         n--;
+         if ((*dst++ = *src++) == '\0') {
+             /* If we get here, we found a null character at the end
+                of s2, so use memset to put null bytes at the end of
+                s1.  */
+             memset(dst, '\0', n);
+             break;
+         }
+     }
+     return s1;
+ }
+
+// needed because gcc optimises strcpy + strcat to this
+char *stpcpy(char *dest, const char *src) {
+    while (*src) {
+        *dest++ = *src++;
+    }
+    *dest = '\0';
+    return dest;
+}
+
+char *strcat(char *dest, const char *src) {
+    char *d = dest;
+    while (*d) {
+        d++;
+    }
+    while (*src) {
+        *d++ = *src++;
+    }
+    *d = '\0';
+    return dest;
+}
+
+// Public Domain implementation of strchr from:
+// http://en.wikibooks.org/wiki/C_Programming/Strings#The_strchr_function
+char *strchr(const char *s, int c)
+{
+    /* Scan s for the character.  When this loop is finished,
+       s will either point to the end of the string or the
+       character we were looking for.  */
+    while (*s != '\0' && *s != (char)c)
+        s++;
+    return ((*s == c) ? (char *) s : 0);
+}
+
+
+// Public Domain implementation of strstr from:
+// http://en.wikibooks.org/wiki/C_Programming/Strings#The_strstr_function
+char *strstr(const char *haystack, const char *needle)
+{
+    size_t needlelen;
+    /* Check for the null needle case.  */
+    if (*needle == '\0')
+        return (char *) haystack;
+    needlelen = strlen(needle);
+    for (; (haystack = strchr(haystack, *needle)) != 0; haystack++)
+        if (strncmp(haystack, needle, needlelen) == 0)
+            return (char *) haystack;
+    return 0;
+}
+
+size_t strspn(const char *s, const char *accept) {
+    const char *ss = s;
+    while (*s && strchr(accept, *s) != NULL) {
+        ++s;
+    }
+    return s - ss;
+}
+
+size_t strcspn(const char *s, const char *reject) {
+    const char *ss = s;
+    while (*s && strchr(reject, *s) == NULL) {
+        ++s;
+    }
+    return s - ss;
+}