4 files changed, 358 insertions, 0 deletions
diff --git a/sys/lib/string/itoa.c b/sys/lib/string/itoa.c
new file mode 100644
index 0000000..34dd2bf
--- /dev/null
+++ b/sys/lib/string/itoa.c
@@ -0,0 +1,135 @@
+/*
+ * Copyright (c) 2023-2024 Ian Marco Moffett and the Osmora Team.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. 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.
+ * 3. Neither the name of Hyra 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.
+ */
+
+#include <sys/types.h>
+#include <string.h>
+
+static char *itoa_base10_convert(int64_t value, char *buf);
+
+static char *
+itoa_base10_convert(int64_t value, char *buf)
+{
+    size_t i;
+    uint8_t tmp;
+    bool is_negative;
+
+    i = 0;
+    is_negative = false;
+
+    if (value == 0) {
+        buf[i++] = '0';
+        buf[i++] = '\0';
+        return buf;
+    }
+
+    if (value < 0) {
+        /* Easier to handle positive numbers */
+        value *= -1;
+        is_negative = true;
+    }
+
+    while (value > 0) {
+        buf[i++] = '0' + (value % 10);
+        value /= 10;
+    }
+
+    if (is_negative) {
+        buf[i++] = '-';
+    }
+
+    buf[i--] = '\0';
+
+    /* Result is in reverse */
+    for (int j = 0; j < i; ++j, --i) {
+        tmp = buf[j];
+        buf[j] = buf[i];
+        buf[i] = tmp;
+    }
+
+    return buf;
+}
+
+static char *
+itoa_convert_base16(uint64_t n, char *buffer)
+{
+    bool pad;
+    uint8_t nibble;
+    uint8_t i, j, tmp;
+    const char *ascii_nums = "0123456789ABCDEF";
+
+    i = 0;
+    pad = false;
+
+    if (n == 0) {
+        /* Zero, no need to parse */
+        memcpy(buffer, "0x00\0", 5);
+        return buffer;
+    }
+    /* If one digit, pad out 2 later */
+    if (n < 0x10) {
+        pad = true;
+    }
+
+    while (n > 0) {
+        nibble = (uint8_t)n & 0x0F;
+        nibble = ascii_nums[nibble];
+        buffer[i++] = nibble;
+        n >>= 4;        /* Fetch next nibble */
+    }
+
+    if (pad) {
+        buffer[i++] = '0';
+    }
+
+    /* Add "0x" prefix */
+    buffer[i++] = 'x';
+    buffer[i++] = '0';
+    buffer[i--] = '\0';
+
+    /* Unreverse the result */
+    for (j = 0; j < i; ++j, --i) {
+        tmp = buffer[j];
+        buffer[j] = buffer[i];
+        buffer[i] = tmp;
+    }
+    return buffer;
+}
+
+char *
+itoa(int64_t value, char *buf, int base)
+{
+    switch (base) {
+        case 10:
+            return itoa_base10_convert(value, buf);
+        case 16:
+            return itoa_convert_base16(value, buf);
+        default:
+            return NULL;
+    }
+}
diff --git a/sys/lib/string/memcpy.c b/sys/lib/string/memcpy.c
new file mode 100644
index 0000000..5fbb843
--- /dev/null
+++ b/sys/lib/string/memcpy.c
@@ -0,0 +1,40 @@
+/*
+ * Copyright (c) 2023-2024 Ian Marco Moffett and the Osmora Team.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. 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.
+ * 3. Neither the name of Hyra 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.
+ */
+
+#include <string.h>
+
+void *
+memcpy(void *dest, const void *src, size_t n)
+{
+    for (size_t i = 0; i < n; ++i) {
+        ((char *)dest)[i] = ((char *)src)[i];
+    }
+
+    return dest;
+}
diff --git a/sys/lib/string/strlen.c b/sys/lib/string/strlen.c
new file mode 100644
index 0000000..85ccf23
--- /dev/null
+++ b/sys/lib/string/strlen.c
@@ -0,0 +1,40 @@
+/*
+ * Copyright (c) 2023-2024 Ian Marco Moffett and the Osmora Team.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. 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.
+ * 3. Neither the name of Hyra 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.
+ */
+
+#include <string.h>
+
+size_t
+strlen(const char *s)
+{
+    size_t len;
+
+    len = 0;
+    while (s[len++]);
+    return len - 1;
+}
diff --git a/sys/lib/string/vsnprintf.c b/sys/lib/string/vsnprintf.c
new file mode 100644
index 0000000..30127d8
--- /dev/null
+++ b/sys/lib/string/vsnprintf.c
@@ -0,0 +1,143 @@
+/*
+ * Copyright (c) 2023-2024 Ian Marco Moffett and the Osmora Team.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. 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.
+ * 3. Neither the name of Hyra 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.
+ */
+
+#include <sys/types.h>
+#include <string.h>
+#include <stdarg.h>
+
+static inline void
+printc(char *buf, size_t size, size_t *off, char c)
+{
+    if (*off < size - 1) {
+        buf[(*off)++] = c;
+    }
+    buf[*off] = 0;
+}
+
+static void
+printstr(char *buf, size_t size, size_t *off, const char *s)
+{
+    while (*off < size - 1 && *s != '\0') {
+        buf[(*off)++] = *(s)++;
+    }
+    buf[*off] = 0;
+}
+
+int
+snprintf(char *s, size_t size, const char *fmt, ...)
+{
+    va_list ap;
+    int ret;
+
+    va_start(ap, fmt);
+    ret = vsnprintf(s, size, fmt, ap);
+    va_end(ap);
+    return ret;
+}
+
+int
+vsnprintf(char *s, size_t size, const char *fmt, va_list ap)
+{
+    size_t tmp_len, num_len, off = 0;
+    ssize_t num = 0;
+    char c, c1, num_buf[256] = {0};
+    const char *tmp_str;
+    uint8_t pad_width = 0;
+
+    while (off < (size - 1)) {
+        while (*fmt && *fmt != '%') {
+            printc(s, size, &off, *fmt++);
+        }
+        if (*(fmt)++ == '\0' || off == size - 1) {
+            return off;
+        }
+
+        /*
+         * Handle a case where we have "%0N". For example:
+         * "%04d"
+         */
+        if (*fmt == '0') {
+            ++fmt;
+            while (*fmt >= '0' && *fmt <= '9') {
+                pad_width = pad_width * 10 + (*fmt - '0');
+                ++fmt;
+            }
+        }
+
+        c = *fmt++;
+        switch (c) {
+        case 'c':
+            c1 = (char )va_arg(ap, int);
+            printc(s, size, &off, c1);
+            break;
+        case 'd':
+            num = va_arg(ap, int);
+            itoa(num, num_buf, 10);
+
+            if (pad_width > 0) {
+                num_len = strlen(num_buf);
+                for (size_t i = num_len; i < pad_width; ++i)
+                    printc(s, size, &off, '0');
+            }
+            printstr(s, size, &off, num_buf);
+            break;
+        case 'p':
+            num = va_arg(ap, uint64_t);
+            itoa(num, num_buf, 16);
+            tmp_len = strlen(num_buf);
+
+            /* Add '0x' prefix */
+            printc(s, size, &off, '0');
+            printc(s, size, &off, 'x');
+            /*
+             * Now we pad this.
+             *
+             * XXX TODO: This assumes 64-bits, should be
+             *           cleaned up.
+             */
+            for (size_t i = 0; i < 18 - tmp_len; ++i) {
+                printc(s, size, &off, '0');
+            }
+            printstr(s, size, &off, num_buf + 2);
+            break;
+        case 'x':
+            num = va_arg(ap, uint64_t);
+            itoa(num, num_buf, 16);
+            tmp_len = strlen(num_buf);
+            printstr(s, size, &off, num_buf + 2);
+            break;
+        case 's':
+            tmp_str = va_arg(ap, const char *);
+            printstr(s, size, &off, tmp_str);
+            break;
+        }
+    }
+
+    return 0;
+}