1 // Copyright (2013) Jann Horn <jann@thejh.net>
8 HEADER #include <stdint.h>
10 HEADER #define streq(a,b) (!strcmp((a),(b)))
12 HEADER #define TPRINTF(name, ...) \
15 HEADER int __tprintf_size = snprintf(NULL, 0, __VA_ARGS__); \
16 HEADER assert(__tprintf_size != -1); \
17 HEADER name = alloca(__tprintf_size+1); \
18 HEADER int __tprintf_size2 = snprintf(name, __tprintf_size+1, __VA_ARGS__); \
19 HEADER assert(__tprintf_size == __tprintf_size2); \
20 HEADER } while (0); //////////////////////////////////////////////////////////
22 PUBLIC_FN int count_char_occurences(char *s, char c) {
32 PUBLIC_FN size_t count_char_occurences_in_buf(char *b, size_t bl, char c) {
38 // do it the simple way until we get to the next 16-byte-aligned address
39 while ((((uint64_t)b)&0xf) && b<be) if (*(b++)==c) res++;
41 // the aligned end is the last 8-byte-aligned byte IN this buffer
42 char *bea = (char *) (((uint64_t)be-1)&~0xf);
43 // prepare a 128-bit value that contains 16 times `c`
46 // we have an 16-byte-aligned buffer ready – let's do it!
47 __m128i *bi = (__m128i *)b;
48 while (((char*)bi)<bea) {
49 // This intrinsic does a byte-wise compare, storing the results byte-wise,
50 // too. 0xff means equal, 0x00 means not equal.
51 __m128i r = _mm_cmpeq_epi8(cx, *bi);
52 int64_t *r_64 = (int64_t*)&r;
53 if ((r_64[0]|r_64[1])) {
54 char *r_8 = (char *)&r;
55 // we have at least one hit in those 16 chars. narrow it down to eight,
56 // then check those eight
58 if (r_8[ 0]) res++; if (r_8[ 1]) res++;
59 if (r_8[ 2]) res++; if (r_8[ 3]) res++;
60 if (r_8[ 4]) res++; if (r_8[ 5]) res++;
61 if (r_8[ 6]) res++; if (r_8[ 7]) res++;
64 if (r_8[ 8]) res++; if (r_8[ 9]) res++;
65 if (r_8[10]) res++; if (r_8[11]) res++;
66 if (r_8[12]) res++; if (r_8[13]) res++;
67 if (r_8[14]) res++; if (r_8[15]) res++;
73 // do the last few bytes the slow way, too
77 // this is also the fallback in case the CPU can't do this
78 while (b<be) if (*(b++)==c) res++;
84 PUBLIC_FN int count_and_replace_char_occurences_in_buf(char *b, size_t bl, char c, char new_c) {
90 // do it the simple way until we get to the next 16-byte-aligned address
91 while ((((uint64_t)b)&0xf) && b<be) if (*(b++)==c) res++;
93 // the aligned end is the last 8-byte-aligned byte IN this buffer
94 char *bea = (char *) (((uint64_t)be-1)&~0xf);
95 // prepare a 128-bit value that contains 16 times `c`
98 // we have an 16-byte-aligned buffer ready – let's do it!
99 __m128i *bi = (__m128i *)b;
100 while (((char*)bi)<bea) {
101 // This intrinsic does a byte-wise compare, storing the results byte-wise,
102 // too. 0xff means equal, 0x00 means not equal.
103 __m128i r = _mm_cmpeq_epi8(cx, *bi);
104 int64_t *r_64 = (int64_t*)&r;
105 if ((r_64[0]|r_64[1])) {
106 char *r_8 = (char *)&r;
107 // we have at least one hit in those 16 chars. narrow it down to eight,
108 // then check those eight
110 if (r_8[ 0]) r_8[ 0]=new_c, res++; if (r_8[ 1]) r_8[ 1]=new_c, res++;
111 if (r_8[ 2]) r_8[ 2]=new_c, res++; if (r_8[ 3]) r_8[ 3]=new_c, res++;
112 if (r_8[ 0]) r_8[ 4]=new_c, res++; if (r_8[ 1]) r_8[ 5]=new_c, res++;
113 if (r_8[ 2]) r_8[ 6]=new_c, res++; if (r_8[ 3]) r_8[ 7]=new_c, res++;
116 if (r_8[ 8]) r_8[ 8]=new_c, res++; if (r_8[ 9]) r_8[ 9]=new_c, res++;
117 if (r_8[10]) r_8[10]=new_c, res++; if (r_8[11]) r_8[11]=new_c, res++;
118 if (r_8[12]) r_8[12]=new_c, res++; if (r_8[13]) r_8[13]=new_c, res++;
119 if (r_8[14]) r_8[14]=new_c, res++; if (r_8[15]) r_8[15]=new_c, res++;
125 // do the last few bytes the slow way, too
129 // this is also the fallback in case the CPU can't do this
130 while (b<be) if (*(b++)==c) res++;
135 // memcpy plus terminating nullbyte
136 PUBLIC_FN void *memcpyn(void *d, const void *s, size_t n) {
143 // Wipe out whitespace characters at the end of str using nullbytes.
144 PUBLIC_FN void trim_end(char *str, char *whitespace) {
145 for (char *p = str+strlen(str)-1; p>=str; p--) {
146 if (!strchr(whitespace, *p)) break;
152 PUBLIC_FN int ends_with(char *str, char *sub) {
153 size_t str_len = strlen(str);
154 size_t sub_len = strlen(sub);
155 if (sub_len>str_len) return 0;
156 return streq(str+str_len-sub_len, sub);
159 PUBLIC_FN char **buf_to_linearray(char *buf, ssize_t buflen) {
160 if (buflen == -1) buflen = strlen(buf);
161 size_t linecount = count_char_occurences_in_buf(buf, buflen, '\n')+1;
162 char **ret = malloc(linecount * sizeof(char*) + 1);
163 ret[linecount] = NULL;
164 if (ret == NULL) return NULL;
166 *(r++) = buf; /* first line starts at byte zero */
168 char *be = buf+buflen;