snac2/xs.h

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/* copyright (c) 2022 - 2023 grunfink / MIT license */
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#ifndef _XS_H
#define _XS_H
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <ctype.h>
#include <unistd.h>
#include <stdarg.h>
#include <signal.h>
#include <errno.h>
typedef enum {
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XSTYPE_STRING = 0x02, /* C string (\0 delimited) (NOT STORED) */
XSTYPE_NUMBER = 0x17, /* C string (\0 delimited) */
XSTYPE_NULL = 0x18, /* Special NULL value */
XSTYPE_TRUE = 0x06, /* Boolean */
XSTYPE_FALSE = 0x15, /* Boolean */
XSTYPE_LIST = 0x1d, /* Sequence of LITEMs up to EOM (with 24bit size) */
XSTYPE_LITEM = 0x1f, /* Element of a list (any type) */
XSTYPE_DICT = 0x1c, /* Sequence of DITEMs up to EOM (with 24bit size) */
XSTYPE_DITEM = 0x1e, /* Element of a dict (STRING key + any type) */
XSTYPE_EOM = 0x19 /* End of Multiple (LIST or DICT) */
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} xstype;
/* dynamic strings */
typedef char d_char;
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/* types */
typedef char xs_val;
typedef char xs_str;
typedef char xs_list;
typedef char xs_dict;
typedef char xs_number;
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/* auto-destroyable strings */
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#define xs __attribute__ ((__cleanup__ (_xs_destroy))) xs_val
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/* not really all, just very much */
#define XS_ALL 0xfffffff
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void *xs_free(void *ptr);
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void *_xs_realloc(void *ptr, size_t size, const char *file, int line, const char *func);
#define xs_realloc(ptr, size) _xs_realloc(ptr, size, __FILE__, __LINE__, __FUNCTION__)
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int _xs_blk_size(int sz);
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void _xs_destroy(char **var);
#define xs_debug() raise(SIGTRAP)
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xstype xs_type(const xs_val *data);
int xs_size(const xs_val *data);
int xs_is_null(const xs_val *data);
xs_val *xs_dup(const xs_val *data);
xs_val *xs_expand(xs_val *data, int offset, int size);
xs_val *xs_collapse(xs_val *data, int offset, int size);
xs_val *xs_insert_m(xs_val *data, int offset, const char *mem, int size);
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#define xs_insert(data, offset, data2) xs_insert_m(data, offset, data2, xs_size(data2))
#define xs_append_m(data, mem, size) xs_insert_m(data, xs_size(data) - 1, mem, size)
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xs_str *xs_str_new(const char *str);
xs_str *xs_str_wrap_i(const char *prefix, xs_str *str, const char *suffix);
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#define xs_str_prepend_i(str, prefix) xs_str_wrap_i(prefix, str, NULL)
#define xs_str_cat(str, suffix) xs_str_wrap_i(NULL, str, suffix)
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xs_str *xs_replace_i(xs_str *str, const char *sfrom, const char *sto);
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#define xs_replace(str, sfrom, sto) xs_replace_i(xs_dup(str), sfrom, sto)
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xs_str *xs_fmt(const char *fmt, ...);
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int xs_str_in(const char *haystack, const char *needle);
int xs_startswith(const char *str, const char *prefix);
int xs_endswith(const char *str, const char *postfix);
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xs_str *xs_crop_i(xs_str *str, int start, int end);
xs_str *xs_strip_chars_i(xs_str *str, const char *chars);
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#define xs_strip_i(str) xs_strip_chars_i(str, " \r\n\t\v\f")
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xs_str *xs_tolower_i(xs_str *str);
xs_list *xs_list_new(void);
xs_list *xs_list_append_m(xs_list *list, const char *mem, int dsz);
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#define xs_list_append(list, data) xs_list_append_m(list, data, xs_size(data))
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int xs_list_iter(xs_list **list, xs_val **value);
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int xs_list_len(const xs_list *list);
char *xs_list_get(const xs_list *list, int num);
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xs_list *xs_list_del(xs_list *list, int num);
xs_list *xs_list_insert(xs_list *list, int num, const xs_val *data);
xs_list *xs_list_insert_sorted(xs_list *list, const char *str);
xs_list *xs_list_set(xs_list *list, int num, const xs_val *data);
xs_list *xs_list_dequeue(xs_list *list, xs_val **data, int last);
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#define xs_list_pop(list, data) xs_list_dequeue(list, data, 1)
#define xs_list_shift(list, data) xs_list_dequeue(list, data, 0)
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int xs_list_in(const xs_list *list, const xs_val *val);
xs_str *xs_join(const xs_list *list, const char *sep);
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xs_list *xs_split_n(const char *str, const char *sep, int times);
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#define xs_split(str, sep) xs_split_n(str, sep, XS_ALL)
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xs_dict *xs_dict_new(void);
xs_dict *xs_dict_append_m(xs_dict *dict, const xs_str *key, const xs_val *mem, int dsz);
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#define xs_dict_append(dict, key, data) xs_dict_append_m(dict, key, data, xs_size(data))
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int xs_dict_iter(xs_dict **dict, xs_str **key, xs_val **value);
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xs_dict *xs_dict_get(const xs_dict *dict, const xs_str *key);
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xs_dict *xs_dict_del(xs_dict *dict, const xs_str *key);
xs_dict *xs_dict_set(xs_dict *dict, const xs_str *key, const xs_val *data);
xs_val *xs_val_new(xstype t);
xs_number *xs_number_new(double f);
double xs_number_get(const xs_number *v);
const char *xs_number_str(const xs_number *v);
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void *xs_memmem(const char *haystack, int h_size, const char *needle, int n_size);
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#ifdef XS_ASSERT
#include <assert.h>
#define XS_ASSERT_TYPE(v, t) assert(xs_type(v) == t)
#define XS_ASSERT_TYPE_NULL(v, t) assert(v == NULL || xs_type(v) == t)
#else
#define XS_ASSERT_TYPE(v, t) (void)(0)
#define XS_ASSERT_TYPE_NULL(v, t) (void)(0)
#endif
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#ifdef XS_IMPLEMENTATION
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void *_xs_realloc(void *ptr, size_t size, const char *file, int line, const char *func)
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{
d_char *ndata = realloc(ptr, size);
if (ndata == NULL) {
fprintf(stderr, "**OUT OF MEMORY**\n");
abort();
}
#ifdef XS_DEBUG
if (ndata != ptr) {
int n;
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FILE *f = fopen("xs_memory.out", "a");
if (ptr != NULL)
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fprintf(f, "%p r\n", ptr);
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fprintf(f, "%p a %ld %s:%d: %s", ndata, size, file, line, func);
if (ptr != NULL) {
fprintf(f, " [");
for (n = 0; n < 32 && ndata[n]; n++) {
if (ndata[n] >= 32 && ndata[n] <= 127)
fprintf(f, "%c", ndata[n]);
else
fprintf(f, "\\%02x", (unsigned char)ndata[n]);
}
fprintf(f, "]");
}
fprintf(f, "\n");
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fclose(f);
}
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#else
(void)file;
(void)line;
(void)func;
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#endif
return ndata;
}
void *xs_free(void *ptr)
{
#ifdef XS_DEBUG
if (ptr != NULL) {
FILE *f = fopen("xs_memory.out", "a");
fprintf(f, "%p b\n", ptr);
fclose(f);
}
#endif
free(ptr);
return NULL;
}
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void _xs_destroy(char **var)
{
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/*
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if (_xs_debug)
printf("_xs_destroy %p\n", var);
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*/
xs_free(*var);
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}
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int _xs_blk_size(int sz)
/* calculates the block size */
{
int blk_size = 4096;
if (sz < 256)
blk_size = 32;
else
if (sz < 4096)
blk_size = 256;
return ((((sz) + blk_size) / blk_size) * blk_size);
}
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xstype xs_type(const xs_val *data)
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/* return the type of data */
{
xstype t;
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if (data == NULL)
t = XSTYPE_NULL;
else
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switch (data[0]) {
case XSTYPE_NULL:
case XSTYPE_TRUE:
case XSTYPE_FALSE:
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case XSTYPE_LIST:
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case XSTYPE_LITEM:
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case XSTYPE_DICT:
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case XSTYPE_DITEM:
case XSTYPE_NUMBER:
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case XSTYPE_EOM:
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t = data[0];
break;
default:
t = XSTYPE_STRING;
break;
}
return t;
}
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void _xs_put_24b(xs_val *ptr, int i)
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/* writes i as a 24 bit value */
{
unsigned char *p = (unsigned char *)ptr;
p[0] = (i >> 16) & 0xff;
p[1] = (i >> 8) & 0xff;
p[2] = i & 0xff;
}
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int _xs_get_24b(const xs_val *ptr)
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/* reads a 24 bit value */
{
unsigned char *p = (unsigned char *)ptr;
return (p[0] << 16) | (p[1] << 8) | p[2];
}
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int xs_size(const xs_val *data)
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/* returns the size of data in bytes */
{
int len = 0;
const char *p;
if (data == NULL)
return 0;
switch (xs_type(data)) {
case XSTYPE_STRING:
len = strlen(data) + 1;
break;
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case XSTYPE_LIST:
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len = _xs_get_24b(data + 1);
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break;
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case XSTYPE_DICT:
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len = _xs_get_24b(data + 1);
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break;
case XSTYPE_DITEM:
/* calculate the size of the key and the value */
p = data + 1;
p += xs_size(p);
p += xs_size(p);
len = p - data;
break;
case XSTYPE_LITEM:
/* it's the size of the item + 1 */
p = data + 1;
p += xs_size(p);
len = p - data;
break;
case XSTYPE_NUMBER:
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len = 1 + xs_size(data + 1);
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break;
default:
len = 1;
}
return len;
}
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int xs_is_null(const xs_val *data)
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/* checks for null */
{
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return (xs_type(data) == XSTYPE_NULL);
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}
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xs_val *xs_dup(const xs_val *data)
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/* creates a duplicate of data */
{
int sz = xs_size(data);
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xs_val *s = xs_realloc(NULL, _xs_blk_size(sz));
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memcpy(s, data, sz);
return s;
}
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xs_val *xs_expand(xs_val *data, int offset, int size)
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/* opens a hole in data */
{
int sz = xs_size(data);
/* open room */
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if (sz == 0 || _xs_blk_size(sz) != _xs_blk_size(sz + size))
data = xs_realloc(data, _xs_blk_size(sz + size));
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/* move up the rest of the data */
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if (data != NULL)
memmove(data + offset + size, data + offset, sz - offset);
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if (xs_type(data) == XSTYPE_LIST || xs_type(data) == XSTYPE_DICT)
_xs_put_24b(data + 1, sz + size);
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return data;
}
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xs_val *xs_collapse(xs_val *data, int offset, int size)
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/* shrinks data */
{
int sz = xs_size(data);
int n;
/* don't try to delete beyond the limit */
if (offset + size > sz)
size = sz - offset;
/* shrink total size */
sz -= size;
for (n = offset; n < sz; n++)
data[n] = data[n + size];
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if (xs_type(data) == XSTYPE_LIST || xs_type(data) == XSTYPE_DICT)
_xs_put_24b(data + 1, sz);
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return xs_realloc(data, _xs_blk_size(sz));
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}
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xs_val *xs_insert_m(xs_val *data, int offset, const char *mem, int size)
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/* inserts a memory block */
{
data = xs_expand(data, offset, size);
memcpy(data + offset, mem, size);
return data;
}
/** strings **/
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xs_str *xs_str_new(const char *str)
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/* creates a new string */
{
return xs_insert(NULL, 0, str ? str : "");
}
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xs_str *xs_str_wrap_i(const char *prefix, xs_str *str, const char *suffix)
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/* wraps str with prefix and suffix */
{
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XS_ASSERT_TYPE(str, XSTYPE_STRING);
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if (prefix)
str = xs_insert_m(str, 0, prefix, strlen(prefix));
if (suffix)
str = xs_insert_m(str, xs_size(str) - 1, suffix, xs_size(suffix));
return str;
}
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xs_str *xs_replace_i(xs_str *str, const char *sfrom, const char *sto)
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/* replaces inline all sfrom with sto */
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{
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XS_ASSERT_TYPE(str, XSTYPE_STRING);
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int sfsz = strlen(sfrom);
int stsz = strlen(sto);
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char *ss;
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int offset = 0;
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while ((ss = strstr(str + offset, sfrom)) != NULL) {
int n_offset = ss - str;
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str = xs_collapse(str, n_offset, sfsz);
str = xs_expand(str, n_offset, stsz);
memcpy(str + n_offset, sto, stsz);
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offset = n_offset + stsz;
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}
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return str;
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}
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xs_str *xs_fmt(const char *fmt, ...)
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/* formats a string with printf()-like marks */
{
int n;
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xs_str *s = NULL;
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va_list ap;
va_start(ap, fmt);
n = vsnprintf(s, 0, fmt, ap);
va_end(ap);
if (n > 0) {
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s = xs_realloc(NULL, _xs_blk_size(n + 1));
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va_start(ap, fmt);
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vsnprintf(s, n + 1, fmt, ap);
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va_end(ap);
}
return s;
}
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int xs_str_in(const char *haystack, const char *needle)
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/* finds needle in haystack and returns the offset or -1 */
{
char *s;
int r = -1;
if ((s = strstr(haystack, needle)) != NULL)
r = s - haystack;
return r;
}
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int xs_startswith(const char *str, const char *prefix)
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/* returns true if str starts with prefix */
{
return !!(xs_str_in(str, prefix) == 0);
}
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int xs_endswith(const char *str, const char *postfix)
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/* returns true if str ends with postfix */
{
int ssz = strlen(str);
int psz = strlen(postfix);
return !!(ssz >= psz && memcmp(postfix, str + ssz - psz, psz) == 0);
}
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xs_str *xs_crop_i(xs_str *str, int start, int end)
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/* crops the d_char to be only from start to end */
{
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XS_ASSERT_TYPE(str, XSTYPE_STRING);
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int sz = strlen(str);
if (end <= 0)
end = sz + end;
/* crop from the top */
str[end] = '\0';
/* crop from the bottom */
str = xs_collapse(str, 0, start);
return str;
}
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xs_str *xs_strip_chars_i(xs_str *str, const char *chars)
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/* strips the string of chars from the start and the end */
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{
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XS_ASSERT_TYPE(str, XSTYPE_STRING);
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int n;
/* strip first from the end */
for (n = strlen(str); n > 0 && strchr(chars, str[n - 1]); n--);
str[n] = '\0';
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if (str[0]) {
/* now strip from the beginning */
for (n = 0; str[n] && strchr(chars, str[n]); n++);
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if (n)
str = xs_collapse(str, 0, n);
}
return str;
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}
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xs_str *xs_tolower_i(xs_str *str)
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/* convert to lowercase */
{
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XS_ASSERT_TYPE(str, XSTYPE_STRING);
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int n;
for (n = 0; str[n]; n++)
str[n] = tolower(str[n]);
return str;
}
/** lists **/
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xs_list *xs_list_new(void)
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/* creates a new list */
{
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xs_list *list;
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list = xs_realloc(NULL, _xs_blk_size(5));
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list[0] = XSTYPE_LIST;
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list[4] = XSTYPE_EOM;
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_xs_put_24b(list + 1, 5);
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return list;
}
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xs_list *_xs_list_write_litem(xs_list *list, int offset, const char *mem, int dsz)
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/* writes a list item */
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{
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XS_ASSERT_TYPE(list, XSTYPE_LIST);
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char c = XSTYPE_LITEM;
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list = xs_insert_m(list, offset, &c, 1);
list = xs_insert_m(list, offset + 1, mem, dsz);
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return list;
}
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xs_list *xs_list_append_m(xs_list *list, const char *mem, int dsz)
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/* adds a memory block to the list */
{
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XS_ASSERT_TYPE(list, XSTYPE_LIST);
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return _xs_list_write_litem(list, xs_size(list) - 1, mem, dsz);
}
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int xs_list_iter(xs_list **list, xs_val **value)
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/* iterates a list value */
{
int goon = 1;
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xs_val *p = *list;
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/* skip the start of the list */
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if (xs_type(p) == XSTYPE_LIST)
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p += 4;
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/* an element? */
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if (xs_type(p) == XSTYPE_LITEM) {
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p++;
*value = p;
p += xs_size(*value);
}
else {
/* end of list */
goon = 0;
}
/* store back the pointer */
*list = p;
return goon;
}
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int xs_list_len(const xs_list *list)
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/* returns the number of elements in the list */
{
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XS_ASSERT_TYPE_NULL(list, XSTYPE_LIST);
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int c = 0;
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xs_list *p = (xs_list *)list;
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xs_val *v;
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while (xs_list_iter(&p, &v))
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c++;
return c;
}
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xs_val *xs_list_get(const xs_list *list, int num)
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/* returns the element #num */
{
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XS_ASSERT_TYPE(list, XSTYPE_LIST);
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if (num < 0)
num = xs_list_len(list) + num;
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int c = 0;
xs_list *p = (xs_list *)list;
xs_val *v;
while (xs_list_iter(&p, &v)) {
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if (c == num)
return v;
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c++;
}
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return NULL;
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}
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xs_list *xs_list_del(xs_list *list, int num)
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/* deletes element #num */
{
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XS_ASSERT_TYPE(list, XSTYPE_LIST);
xs_val *v;
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if ((v = xs_list_get(list, num)) != NULL)
list = xs_collapse(list, v - 1 - list, xs_size(v - 1));
return list;
}
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xs_list *xs_list_insert(xs_list *list, int num, const xs_val *data)
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/* inserts an element at #num position */
{
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XS_ASSERT_TYPE(list, XSTYPE_LIST);
xs_val *v;
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int offset;
if ((v = xs_list_get(list, num)) != NULL)
offset = v - list;
else
offset = xs_size(list);
return _xs_list_write_litem(list, offset - 1, data, xs_size(data));
}
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xs_list *xs_list_insert_sorted(xs_list *list, const xs_str *str)
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/* inserts a string in the list in its ordered position */
{
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XS_ASSERT_TYPE(list, XSTYPE_LIST);
XS_ASSERT_TYPE(str, XSTYPE_STRING);
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char *p, *v;
int offset = xs_size(list);
p = list;
while (xs_list_iter(&p, &v)) {
/* if this element is greater or equal, insert here */
if (strcmp(v, str) >= 0) {
offset = v - list;
break;
}
}
return _xs_list_write_litem(list, offset - 1, str, xs_size(str));
}
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xs_list *xs_list_set(xs_list *list, int num, const xs_val *data)
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/* sets the element at #num position */
{
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XS_ASSERT_TYPE(list, XSTYPE_LIST);
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list = xs_list_del(list, num);
list = xs_list_insert(list, num, data);
return list;
}
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xs_list *xs_list_dequeue(xs_list *list, xs_val **data, int last)
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/* gets a copy of the first or last element of a list, shrinking it */
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{
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XS_ASSERT_TYPE(list, XSTYPE_LIST);
xs_list *p = list;
xs_val *v = NULL;
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if (!last) {
/* get the first */
xs_list_iter(&p, &v);
}
else {
/* iterate to the end */
while (xs_list_iter(&p, &v));
}
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if (v != NULL) {
*data = xs_dup(v);
/* collapse from the address of the element */
list = xs_collapse(list, v - 1 - list, xs_size(v - 1));
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}
return list;
}
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int xs_list_in(const xs_list *list, const xs_val *val)
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/* returns the position of val in list or -1 */
{
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XS_ASSERT_TYPE_NULL(list, XSTYPE_LIST);
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int n = 0;
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xs_list *p = (xs_list *)list;
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xs_val *v;
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int sz = xs_size(val);
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while (xs_list_iter(&p, &v)) {
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if (sz == xs_size(v) && memcmp(val, v, sz) == 0)
return n;
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n++;
}
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return -1;
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}
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xs_str *xs_join(const xs_list *list, const char *sep)
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/* joins a list into a string */
{
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XS_ASSERT_TYPE(list, XSTYPE_LIST);
xs_str *s = NULL;
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xs_list *p = (xs_list *)list;
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xs_val *v;
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int c = 0;
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int offset = 0;
int ssz = strlen(sep);
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while (xs_list_iter(&p, &v)) {
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/* refuse to join non-string values */
if (xs_type(v) == XSTYPE_STRING) {
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int sz;
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/* add the separator */
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if (c != 0) {
s = xs_realloc(s, offset + ssz);
memcpy(s + offset, sep, ssz);
offset += ssz;
}
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/* add the element */
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sz = strlen(v);
s = xs_realloc(s, offset + sz);
memcpy(s + offset, v, sz);
offset += sz;
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c++;
}
}
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/* null-terminate */
s = xs_realloc(s, _xs_blk_size(offset + 1));
s[offset] = '\0';
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return s;
}
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xs_list *xs_split_n(const char *str, const char *sep, int times)
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/* splits a string into a list upto n times */
{
int sz = strlen(sep);
char *ss;
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xs_list *list;
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list = xs_list_new();
while (times > 0 && (ss = strstr(str, sep)) != NULL) {
/* add the first part (without the asciiz) */
list = xs_list_append_m(list, str, ss - str);
/* add the asciiz */
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list = xs_insert_m(list, xs_size(list) - 1, "", 1);
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/* skip past the separator */
str = ss + sz;
times--;
}
/* add the rest of the string */
list = xs_list_append(list, str);
return list;
}
/** dicts **/
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xs_dict *xs_dict_new(void)
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/* creates a new dict */
{
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xs_dict *dict;
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dict = xs_realloc(NULL, _xs_blk_size(5));
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dict[0] = XSTYPE_DICT;
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dict[4] = XSTYPE_EOM;
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_xs_put_24b(dict + 1, 5);
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return dict;
}
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xs_dict *xs_dict_append_m(xs_dict *dict, const xs_str *key, const xs_val *mem, int dsz)
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/* adds a memory block to the dict */
{
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XS_ASSERT_TYPE(dict, XSTYPE_DICT);
XS_ASSERT_TYPE(key, XSTYPE_STRING);
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char c = XSTYPE_DITEM;
int sz = xs_size(dict);
int ksz = xs_size(key);
dict = xs_insert_m(dict, sz - 1, &c, 1);
dict = xs_insert_m(dict, sz, key, ksz);
dict = xs_insert_m(dict, sz + ksz, mem, dsz);
return dict;
}
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int xs_dict_iter(xs_dict **dict, xs_str **key, xs_val **value)
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/* iterates a dict value */
{
int goon = 1;
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xs_val *p = *dict;
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/* skip the start of the list */
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if (xs_type(p) == XSTYPE_DICT)
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p += 4;
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/* an element? */
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if (xs_type(p) == XSTYPE_DITEM) {
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p++;
*key = p;
p += xs_size(*key);
*value = p;
p += xs_size(*value);
}
else {
/* end of list */
goon = 0;
}
/* store back the pointer */
*dict = p;
return goon;
}
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xs_val *xs_dict_get(const xs_dict *dict, const xs_str *key)
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/* returns the value directed by key */
{
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XS_ASSERT_TYPE(dict, XSTYPE_DICT);
XS_ASSERT_TYPE(key, XSTYPE_STRING);
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xs_dict *p = (xs_dict *)dict;
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xs_str *k;
xs_val *v;
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while (xs_dict_iter(&p, &k, &v)) {
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if (strcmp(k, key) == 0)
return v;
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}
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return NULL;
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}
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xs_dict *xs_dict_del(xs_dict *dict, const xs_str *key)
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/* deletes a key */
{
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XS_ASSERT_TYPE(dict, XSTYPE_DICT);
XS_ASSERT_TYPE(key, XSTYPE_STRING);
xs_str *k;
xs_val *v;
xs_dict *p = dict;
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while (xs_dict_iter(&p, &k, &v)) {
if (strcmp(k, key) == 0) {
/* the address of the item is just behind the key */
char *i = k - 1;
dict = xs_collapse(dict, i - dict, xs_size(i));
break;
}
}
return dict;
}
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xs_dict *xs_dict_set(xs_dict *dict, const xs_str *key, const xs_val *data)
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/* sets (replaces) a key */
{
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XS_ASSERT_TYPE(dict, XSTYPE_DICT);
XS_ASSERT_TYPE(key, XSTYPE_STRING);
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/* delete the possibly existing key */
dict = xs_dict_del(dict, key);
/* append the data */
dict = xs_dict_append(dict, key, data);
return dict;
}
/** other values **/
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xs_val *xs_val_new(xstype t)
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/* adds a new special value */
{
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xs_val *v = xs_realloc(NULL, _xs_blk_size(1));
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v[0] = t;
return v;
}
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/** numbers */
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xs_number *xs_number_new(double f)
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/* adds a new number value */
{
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xs_number *v;
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char tmp[64];
snprintf(tmp, sizeof(tmp), "%.15lf", f);
/* strip useless zeros */
if (strchr(tmp, '.') != NULL) {
char *ptr;
for (ptr = tmp + strlen(tmp) - 1; *ptr == '0'; ptr--);
if (*ptr != '.')
ptr++;
*ptr = '\0';
}
/* alloc for the marker and the full string */
v = xs_realloc(NULL, _xs_blk_size(1 + xs_size(tmp)));
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v[0] = XSTYPE_NUMBER;
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memcpy(&v[1], tmp, xs_size(tmp));
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return v;
}
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double xs_number_get(const xs_number *v)
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/* gets the number as a double */
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{
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double f = 0.0;
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if (v != NULL && v[0] == XSTYPE_NUMBER)
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f = atof(&v[1]);
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return f;
}
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const char *xs_number_str(const xs_number *v)
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/* gets the number as a string */
{
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const char *p = NULL;
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if (v != NULL && v[0] == XSTYPE_NUMBER)
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p = &v[1];
return p;
}
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void *xs_memmem(const char *haystack, int h_size, const char *needle, int n_size)
/* clone of memmem */
{
char *p, *r = NULL;
int offset = 0;
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while (!r && h_size - offset > n_size &&
(p = memchr(haystack + offset, *needle, h_size - offset))) {
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if (memcmp(p, needle, n_size) == 0)
r = p;
else
offset = p - haystack + 1;
}
return r;
}
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#endif /* XS_IMPLEMENTATION */
#endif /* _XS_H */