summaryrefslogtreecommitdiff
path: root/linux/dev/lib
diff options
context:
space:
mode:
Diffstat (limited to 'linux/dev/lib')
-rw-r--r--linux/dev/lib/vsprintf.c350
1 files changed, 350 insertions, 0 deletions
diff --git a/linux/dev/lib/vsprintf.c b/linux/dev/lib/vsprintf.c
new file mode 100644
index 0000000..096e2ec
--- /dev/null
+++ b/linux/dev/lib/vsprintf.c
@@ -0,0 +1,350 @@
+/*
+ * linux/lib/vsprintf.c
+ *
+ * Copyright (C) 1991, 1992 Linus Torvalds
+ */
+
+/* vsprintf.c -- Lars Wirzenius & Linus Torvalds. */
+/*
+ * Wirzenius wrote this portably, Torvalds fucked it up :-)
+ */
+
+#include <sys/types.h>
+
+#define MACH_INCLUDE
+#include <stdarg.h>
+#include <linux/types.h>
+#include <linux/string.h>
+#include <linux/ctype.h>
+
+unsigned long
+simple_strtoul (const char *cp, char **endp, unsigned int base)
+{
+ unsigned long result = 0, value;
+
+ if (!base)
+ {
+ base = 10;
+ if (*cp == '0')
+ {
+ base = 8;
+ cp++;
+ if ((*cp == 'x') && isxdigit (cp[1]))
+ {
+ cp++;
+ base = 16;
+ }
+ }
+ }
+ while (isxdigit (*cp)
+ && (value = isdigit (*cp) ? *cp - '0'
+ : (islower (*cp) ? toupper (*cp) : *cp) - 'A' + 10) < base)
+ {
+ result = result * base + value;
+ cp++;
+ }
+ if (endp)
+ *endp = (char *) cp;
+ return result;
+}
+
+/* we use this so that we can do without the ctype library */
+#define is_digit(c) ((c) >= '0' && (c) <= '9')
+
+static int
+skip_atoi (const char **s)
+{
+ int i = 0;
+
+ while (is_digit (**s))
+ i = i * 10 + *((*s)++) - '0';
+ return i;
+}
+
+#define ZEROPAD 1 /* pad with zero */
+#define SIGN 2 /* unsigned/signed long */
+#define PLUS 4 /* show plus */
+#define SPACE 8 /* space if plus */
+#define LEFT 16 /* left justified */
+#define SPECIAL 32 /* 0x */
+#define LARGE 64 /* use 'ABCDEF' instead of 'abcdef' */
+
+#define do_div(n,base) ({ \
+int __res; \
+__res = ((unsigned long) n) % (unsigned) base; \
+n = ((unsigned long) n) / (unsigned) base; \
+__res; })
+
+static char *
+number (char *str, long num, int base, int size, int precision, int type)
+{
+ char c, sign, tmp[66];
+ const char *digits = "0123456789abcdefghijklmnopqrstuvwxyz";
+ int i;
+
+ if (type & LARGE)
+ digits = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
+ if (type & LEFT)
+ type &= ~ZEROPAD;
+ if (base < 2 || base > 36)
+ return 0;
+ c = (type & ZEROPAD) ? '0' : ' ';
+ sign = 0;
+ if (type & SIGN)
+ {
+ if (num < 0)
+ {
+ sign = '-';
+ num = -num;
+ size--;
+ }
+ else if (type & PLUS)
+ {
+ sign = '+';
+ size--;
+ }
+ else if (type & SPACE)
+ {
+ sign = ' ';
+ size--;
+ }
+ }
+ if (type & SPECIAL)
+ {
+ if (base == 16)
+ size -= 2;
+ else if (base == 8)
+ size--;
+ }
+ i = 0;
+ if (num == 0)
+ tmp[i++] = '0';
+ else
+ while (num != 0)
+ tmp[i++] = digits[do_div (num, base)];
+ if (i > precision)
+ precision = i;
+ size -= precision;
+ if (!(type & (ZEROPAD + LEFT)))
+ while (size-- > 0)
+ *str++ = ' ';
+ if (sign)
+ *str++ = sign;
+ if (type & SPECIAL)
+ if (base == 8)
+ *str++ = '0';
+ else if (base == 16)
+ {
+ *str++ = '0';
+ *str++ = digits[33];
+ }
+ if (!(type & LEFT))
+ while (size-- > 0)
+ *str++ = c;
+ while (i < precision--)
+ *str++ = '0';
+ while (i-- > 0)
+ *str++ = tmp[i];
+ while (size-- > 0)
+ *str++ = ' ';
+ return str;
+}
+
+int
+linux_vsprintf (char *buf, const char *fmt, va_list args)
+{
+ int len;
+ unsigned long num;
+ int i, base;
+ char *str;
+ const char *s;
+
+ int flags; /* flags to number() */
+
+ int field_width; /* width of output field */
+ int precision; /* min. # of digits for integers; max
+ * number of chars for from string
+ */
+ int qualifier; /* 'h', 'l', or 'L' for integer fields */
+
+ for (str = buf; *fmt; ++fmt)
+ {
+ if (*fmt != '%')
+ {
+ *str++ = *fmt;
+ continue;
+ }
+
+ /* process flags */
+ flags = 0;
+ repeat:
+ ++fmt; /* this also skips first '%' */
+ switch (*fmt)
+ {
+ case '-':
+ flags |= LEFT;
+ goto repeat;
+ case '+':
+ flags |= PLUS;
+ goto repeat;
+ case ' ':
+ flags |= SPACE;
+ goto repeat;
+ case '#':
+ flags |= SPECIAL;
+ goto repeat;
+ case '0':
+ flags |= ZEROPAD;
+ goto repeat;
+ }
+
+ /* get field width */
+ field_width = -1;
+ if (is_digit (*fmt))
+ field_width = skip_atoi (&fmt);
+ else if (*fmt == '*')
+ {
+ ++fmt;
+ /* it's the next argument */
+ field_width = va_arg (args, int);
+ if (field_width < 0)
+ {
+ field_width = -field_width;
+ flags |= LEFT;
+ }
+ }
+
+ /* get the precision */
+ precision = -1;
+ if (*fmt == '.')
+ {
+ ++fmt;
+ if (is_digit (*fmt))
+ precision = skip_atoi (&fmt);
+ else if (*fmt == '*')
+ {
+ ++fmt;
+ /* it's the next argument */
+ precision = va_arg (args, int);
+ }
+ if (precision < 0)
+ precision = 0;
+ }
+
+ /* get the conversion qualifier */
+ qualifier = -1;
+ if (*fmt == 'h' || *fmt == 'l' || *fmt == 'L')
+ {
+ qualifier = *fmt;
+ ++fmt;
+ }
+
+ /* default base */
+ base = 10;
+
+ switch (*fmt)
+ {
+ case 'c':
+ if (!(flags & LEFT))
+ while (--field_width > 0)
+ *str++ = ' ';
+ *str++ = (unsigned char) va_arg (args, int);
+ while (--field_width > 0)
+ *str++ = ' ';
+ continue;
+
+ case 's':
+ s = va_arg (args, char *);
+ if (!s)
+ s = "<NULL>";
+
+ len = strnlen (s, precision);
+
+ if (!(flags & LEFT))
+ while (len < field_width--)
+ *str++ = ' ';
+ for (i = 0; i < len; ++i)
+ *str++ = *s++;
+ while (len < field_width--)
+ *str++ = ' ';
+ continue;
+
+ case 'p':
+ if (field_width == -1)
+ {
+ field_width = 2 * sizeof (void *);
+ flags |= ZEROPAD;
+ }
+ str = number (str,
+ (unsigned long) va_arg (args, void *), 16,
+ field_width, precision, flags);
+ continue;
+
+
+ case 'n':
+ if (qualifier == 'l')
+ {
+ long *ip = va_arg (args, long *);
+ *ip = (str - buf);
+ }
+ else
+ {
+ int *ip = va_arg (args, int *);
+ *ip = (str - buf);
+ }
+ continue;
+
+ /* integer number formats - set up the flags and "break" */
+ case 'o':
+ base = 8;
+ break;
+
+ case 'X':
+ flags |= LARGE;
+ case 'x':
+ base = 16;
+ break;
+
+ case 'd':
+ case 'i':
+ flags |= SIGN;
+ case 'u':
+ break;
+
+ default:
+ if (*fmt != '%')
+ *str++ = '%';
+ if (*fmt)
+ *str++ = *fmt;
+ else
+ --fmt;
+ continue;
+ }
+ if (qualifier == 'l')
+ num = va_arg (args, unsigned long);
+ else if (qualifier == 'h')
+ if (flags & SIGN)
+ num = va_arg (args, short);
+ else
+ num = va_arg (args, unsigned short);
+ else if (flags & SIGN)
+ num = va_arg (args, int);
+ else
+ num = va_arg (args, unsigned int);
+ str = number (str, num, base, field_width, precision, flags);
+ }
+ *str = '\0';
+ return str - buf;
+}
+
+int
+linux_sprintf (char *buf, const char *fmt,...)
+{
+ va_list args;
+ int i;
+
+ va_start (args, fmt);
+ i = linux_vsprintf (buf, fmt, args);
+ va_end (args);
+ return i;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-10 06:08:04 +0000