vsprintf: split out '%s' handling logic
The actual code is the same, just split out into a helper function. This makes it easier to read, and allows for future sharing of the string code. Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -482,6 +482,35 @@ static char *number(char *buf, char *end, unsigned long long num, int base, int
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return buf;
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}
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static char *string(char *buf, char *end, char *s, int field_width, int precision, int flags)
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{
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int len, i;
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if ((unsigned long)s < PAGE_SIZE)
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s = "<NULL>";
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len = strnlen(s, precision);
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if (!(flags & LEFT)) {
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while (len < field_width--) {
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if (buf < end)
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*buf = ' ';
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++buf;
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}
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}
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for (i = 0; i < len; ++i) {
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if (buf < end)
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*buf = *s;
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++buf; ++s;
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}
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while (len < field_width--) {
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if (buf < end)
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*buf = ' ';
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++buf;
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}
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return buf;
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}
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/**
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* vsnprintf - Format a string and place it in a buffer
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* @buf: The buffer to place the result into
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@ -502,11 +531,9 @@ static char *number(char *buf, char *end, unsigned long long num, int base, int
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*/
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int vsnprintf(char *buf, size_t size, const char *fmt, va_list args)
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{
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int len;
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unsigned long long num;
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int i, base;
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int base;
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char *str, *end, c;
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const char *s;
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int flags; /* flags to number() */
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@ -622,29 +649,7 @@ int vsnprintf(char *buf, size_t size, const char *fmt, va_list args)
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continue;
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case 's':
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s = va_arg(args, char *);
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if ((unsigned long)s < PAGE_SIZE)
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s = "<NULL>";
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len = strnlen(s, precision);
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if (!(flags & LEFT)) {
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while (len < field_width--) {
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if (str < end)
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*str = ' ';
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++str;
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}
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}
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for (i = 0; i < len; ++i) {
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if (str < end)
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*str = *s;
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++str; ++s;
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}
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while (len < field_width--) {
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if (str < end)
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*str = ' ';
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++str;
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}
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str = string(str, end, va_arg(args, char *), field_width, precision, flags);
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continue;
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case 'p':
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