summaryrefslogtreecommitdiff
path: root/sys/lib/string
diff options
context:
space:
mode:
Diffstat (limited to 'sys/lib/string')
-rw-r--r--sys/lib/string/itoa.c135
-rw-r--r--sys/lib/string/memcpy.c40
-rw-r--r--sys/lib/string/strlen.c40
-rw-r--r--sys/lib/string/vsnprintf.c143
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;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-23 05:33:29 +0000