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1 #include <stdarg.h>
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2 #include <stdio.h>
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3 #include <ctype.h>
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4 #include <string.h>
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5 #include <stdint.h>
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6 #include "kstring.h"
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7
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8 int ksprintf(kstring_t *s, const char *fmt, ...)
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9 {
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10 va_list ap;
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11 int l;
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12 va_start(ap, fmt);
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13 l = vsnprintf(s->s + s->l, s->m - s->l, fmt, ap); // This line does not work with glibc 2.0. See `man snprintf'.
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14 va_end(ap);
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15 if (l + 1 > s->m - s->l) {
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16 s->m = s->l + l + 2;
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17 kroundup32(s->m);
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18 s->s = (char*)realloc(s->s, s->m);
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19 va_start(ap, fmt);
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20 l = vsnprintf(s->s + s->l, s->m - s->l, fmt, ap);
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21 }
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22 va_end(ap);
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23 s->l += l;
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24 return l;
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25 }
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26
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27 char *kstrtok(const char *str, const char *sep, ks_tokaux_t *aux)
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28 {
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29 const char *p, *start;
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30 if (sep) { // set up the table
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31 if (str == 0 && (aux->tab[0]&1)) return 0; // no need to set up if we have finished
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32 aux->finished = 0;
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33 if (sep[1]) {
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34 aux->sep = -1;
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35 aux->tab[0] = aux->tab[1] = aux->tab[2] = aux->tab[3] = 0;
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36 for (p = sep; *p; ++p) aux->tab[*p>>6] |= 1ull<<(*p&0x3f);
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37 } else aux->sep = sep[0];
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38 }
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39 if (aux->finished) return 0;
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40 else if (str) aux->p = str - 1, aux->finished = 0;
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41 if (aux->sep < 0) {
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42 for (p = start = aux->p + 1; *p; ++p)
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43 if (aux->tab[*p>>6]>>(*p&0x3f)&1) break;
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44 } else {
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45 for (p = start = aux->p + 1; *p; ++p)
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46 if (*p == aux->sep) break;
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47 }
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48 aux->p = p; // end of token
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49 if (*p == 0) aux->finished = 1; // no more tokens
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50 return (char*)start;
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51 }
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52
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53 // s MUST BE a null terminated string; l = strlen(s)
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54 int ksplit_core(char *s, int delimiter, int *_max, int **_offsets)
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55 {
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56 int i, n, max, last_char, last_start, *offsets, l;
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57 n = 0; max = *_max; offsets = *_offsets;
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58 l = strlen(s);
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59
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60 #define __ksplit_aux do { \
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61 if (_offsets) { \
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62 s[i] = 0; \
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63 if (n == max) { \
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64 max = max? max<<1 : 2; \
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65 offsets = (int*)realloc(offsets, sizeof(int) * max); \
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66 } \
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67 offsets[n++] = last_start; \
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68 } else ++n; \
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69 } while (0)
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70
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71 for (i = 0, last_char = last_start = 0; i <= l; ++i) {
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72 if (delimiter == 0) {
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73 if (isspace(s[i]) || s[i] == 0) {
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74 if (isgraph(last_char)) __ksplit_aux; // the end of a field
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75 } else {
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76 if (isspace(last_char) || last_char == 0) last_start = i;
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77 }
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78 } else {
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79 if (s[i] == delimiter || s[i] == 0) {
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80 if (last_char != 0 && last_char != delimiter) __ksplit_aux; // the end of a field
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81 } else {
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82 if (last_char == delimiter || last_char == 0) last_start = i;
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83 }
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84 }
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85 last_char = s[i];
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86 }
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87 *_max = max; *_offsets = offsets;
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88 return n;
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89 }
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90
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91 /**********************
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92 * Boyer-Moore search *
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93 **********************/
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94
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95 typedef unsigned char ubyte_t;
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96
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97 // reference: http://www-igm.univ-mlv.fr/~lecroq/string/node14.html
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98 static int *ksBM_prep(const ubyte_t *pat, int m)
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99 {
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100 int i, *suff, *prep, *bmGs, *bmBc;
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101 prep = calloc(m + 256, sizeof(int));
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102 bmGs = prep; bmBc = prep + m;
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103 { // preBmBc()
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104 for (i = 0; i < 256; ++i) bmBc[i] = m;
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105 for (i = 0; i < m - 1; ++i) bmBc[pat[i]] = m - i - 1;
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106 }
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107 suff = calloc(m, sizeof(int));
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108 { // suffixes()
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109 int f = 0, g;
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110 suff[m - 1] = m;
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111 g = m - 1;
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112 for (i = m - 2; i >= 0; --i) {
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113 if (i > g && suff[i + m - 1 - f] < i - g)
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114 suff[i] = suff[i + m - 1 - f];
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115 else {
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116 if (i < g) g = i;
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117 f = i;
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118 while (g >= 0 && pat[g] == pat[g + m - 1 - f]) --g;
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119 suff[i] = f - g;
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120 }
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121 }
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122 }
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123 { // preBmGs()
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124 int j = 0;
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125 for (i = 0; i < m; ++i) bmGs[i] = m;
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126 for (i = m - 1; i >= 0; --i)
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127 if (suff[i] == i + 1)
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128 for (; j < m - 1 - i; ++j)
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129 if (bmGs[j] == m)
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130 bmGs[j] = m - 1 - i;
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131 for (i = 0; i <= m - 2; ++i)
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132 bmGs[m - 1 - suff[i]] = m - 1 - i;
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133 }
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134 free(suff);
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135 return prep;
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136 }
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137
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138 void *kmemmem(const void *_str, int n, const void *_pat, int m, int **_prep)
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139 {
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140 int i, j, *prep = 0, *bmGs, *bmBc;
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141 const ubyte_t *str, *pat;
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142 str = (const ubyte_t*)_str; pat = (const ubyte_t*)_pat;
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143 prep = (_prep == 0 || *_prep == 0)? ksBM_prep(pat, m) : *_prep;
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144 if (_prep && *_prep == 0) *_prep = prep;
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145 bmGs = prep; bmBc = prep + m;
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146 j = 0;
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147 while (j <= n - m) {
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148 for (i = m - 1; i >= 0 && pat[i] == str[i+j]; --i);
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149 if (i >= 0) {
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150 int max = bmBc[str[i+j]] - m + 1 + i;
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151 if (max < bmGs[i]) max = bmGs[i];
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152 j += max;
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153 } else return (void*)(str + j);
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154 }
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155 if (_prep == 0) free(prep);
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156 return 0;
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157 }
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158
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159 char *kstrstr(const char *str, const char *pat, int **_prep)
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160 {
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161 return (char*)kmemmem(str, strlen(str), pat, strlen(pat), _prep);
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162 }
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163
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164 char *kstrnstr(const char *str, const char *pat, int n, int **_prep)
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165 {
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166 return (char*)kmemmem(str, n, pat, strlen(pat), _prep);
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167 }
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168
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169 /***********************
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170 * The main() function *
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171 ***********************/
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172
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173 #ifdef KSTRING_MAIN
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174 #include <stdio.h>
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175 int main()
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176 {
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177 kstring_t *s;
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178 int *fields, n, i;
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179 ks_tokaux_t aux;
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180 char *p;
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181 s = (kstring_t*)calloc(1, sizeof(kstring_t));
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182 // test ksprintf()
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183 ksprintf(s, " abcdefg: %d ", 100);
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184 printf("'%s'\n", s->s);
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185 // test ksplit()
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186 fields = ksplit(s, 0, &n);
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187 for (i = 0; i < n; ++i)
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188 printf("field[%d] = '%s'\n", i, s->s + fields[i]);
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189 // test kstrtok()
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190 s->l = 0;
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191 for (p = kstrtok("ab:cde:fg/hij::k", ":/", &aux); p; p = kstrtok(0, 0, &aux)) {
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192 kputsn(p, aux.p - p, s);
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193 kputc('\n', s);
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194 }
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195 printf("%s", s->s);
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196 // free
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197 free(s->s); free(s); free(fields);
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198
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199 {
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200 static char *str = "abcdefgcdgcagtcakcdcd";
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201 static char *pat = "cd";
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202 char *ret, *s = str;
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203 int *prep = 0;
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204 while ((ret = kstrstr(s, pat, &prep)) != 0) {
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205 printf("match: %s\n", ret);
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206 s = ret + prep[0];
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207 }
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208 free(prep);
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209 }
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210 return 0;
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211 }
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212 #endif
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