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memory: memchrsub and strchrsub

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This commit is contained in:
Scott Prager 2014-09-05 11:49:09 -04:00
parent eff839b26d
commit 07bfc11448
1 changed files with 32 additions and 0 deletions
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32
src/nvim/memory.c
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@ -1,5 +1,6 @@
// Various routines dealing with allocation and deallocation of memory.
#include <assert.h>
#include <errno.h>
#include <inttypes.h>
#include <string.h>
@ -251,6 +252,37 @@ void *xmemscan(const void *addr, char c, size_t size)
return p ? p : (char *)addr + size;
}
/// Replaces every instance of `c` with `x`.
///
/// @warning Will read past `str + strlen(str)` if `c == NUL`.
///
/// @param str A NUL-terminated string.
/// @param c The unwanted byte.
/// @param x The replacement.
void strchrsub(char *str, char c, char x)
FUNC_ATTR_NONNULL_ALL
{
assert(c != '\0');
while ((str = strchr(str, c))) {
*str++ = x;
}
}
/// Replaces every instance of `c` with `x`.
///
/// @param data An object in memory. May contain NULs.
/// @param c The unwanted byte.
/// @param x The replacement.
/// @param len The length of data.
void memchrsub(void *data, char c, char x, size_t len)
FUNC_ATTR_NONNULL_ALL
{
char *p = data, *end = (char *)data + len;
while ((p = memchr(p, c, (size_t)(end - p)))) {
*p++ = x;
}
}
/// The xstpcpy() function shall copy the string pointed to by src (including
/// the terminating NUL character) into the array pointed to by dst.
///