Jeremy Baxter
cae9985747
I'm not sure if any operating system other than OpenBSD has strlcpy/strlcat. May need to use a configure script for this later on.
118 lines
2.2 KiB
C
118 lines
2.2 KiB
C
/*
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* util.c
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*
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* Utility functions.
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*/
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#include <errno.h>
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#include <string.h>
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#include <lua.h>
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#include <lauxlib.h>
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#include "util.h"
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int
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lfail(lua_State *L)
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{
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char strerrbuf[256];
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luaL_pushfail(L);
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strerror_r(errno, strerrbuf, 256);
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lua_pushstring(L, strerrbuf);
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lua_pushinteger(L, errno);
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return 3;
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}
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int
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lfailm(lua_State *L, const char *mesg)
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{
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luaL_pushfail(L);
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lua_pushstring(L, mesg);
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return 2;
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}
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/*
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* strlcat and strlcpy are from OpenBSD source files
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* lib/libc/string/strlcat.c and
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* lib/libc/string/strlcpy.c respectively
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*/
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#ifndef __OpenBSD__
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/*
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* Appends src to string dst of size dsize (unlike strncat, dsize is the
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* full size of dst, not space left). At most dsize-1 characters
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* will be copied. Always NUL terminates (unless dsize <= strlen(dst)).
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* Returns strlen(src) + MIN(dsize, strlen(initial dst)).
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* If retval >= dsize, truncation occurred.
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*/
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size_t
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strlcat(char *dst, const char *src, size_t dsize)
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{
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const char *odst = dst;
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const char *osrc = src;
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size_t n = dsize;
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size_t dlen;
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/* Find the end of dst and adjust bytes left but don't go past end. */
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while (n-- != 0 && *dst != '\0')
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dst++;
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dlen = dst - odst;
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n = dsize - dlen;
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if (n-- == 0)
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return(dlen + strlen(src));
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while (*src != '\0') {
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if (n != 0) {
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*dst++ = *src;
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n--;
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}
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src++;
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}
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*dst = '\0';
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return(dlen + (src - osrc)); /* count does not include NUL */
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}
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/*
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* Copy string src to buffer dst of size dsize. At most dsize-1
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* chars will be copied. Always NUL terminates (unless dsize == 0).
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* Returns strlen(src); if retval >= dsize, truncation occurred.
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*/
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size_t
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strlcpy(char *dst, const char *src, size_t dsize)
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{
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const char *osrc = src;
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size_t nleft = dsize;
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/* Copy as many bytes as will fit. */
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if (nleft != 0) {
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while (--nleft != 0) {
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if ((*dst++ = *src++) == '\0')
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break;
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}
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}
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/* Not enough room in dst, add NUL and traverse rest of src. */
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if (nleft == 0) {
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if (dsize != 0)
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*dst = '\0'; /* NUL-terminate dst */
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while (*src++)
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;
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}
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return(src - osrc - 1); /* count does not include NUL */
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}
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#endif
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/*
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* Prepends t to s.
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*/
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void
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strprepend(char *s, const char *t)
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{
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size_t len = strlen(t);
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memmove(s + len, s, strlen(s) + 1);
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memcpy(s, t, len);
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}
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