xstring.h
1 #ifndef XSTRING 2 #define XSTRING 3 4 typedef struct xstring { 5 char *str; 6 struct xstring *next; 7 } xstring; 8 9 10 ////////////////////////////////////////////////////////////////////////// 11 void* allocate(size_t size); 12 13 #ifdef USE_STD_MALLOC 14 #define dellocate(ptr) free(ptr); 15 #else 16 #define dellocate(ptr) mem_ret(ptr); 17 #endif 18 19 ////////////////////////////////////////////////////////////////////////// 20 xstring* xstring_new(size_t size); 21 void xstring_delete(xstring **head); 22 int xstring_size(xstring *head); 23 24 ////////////////////////////////////////////////////////////////////////// 25 size_t count(char* src, char* dst); 26 char* replace(char *src, char *old_val, char *new_val); 27 xstring* split(char *str, char *delimter); 28 char* strip(char *str); 29 char* lstrip(char *str); 30 char* rstrip(char *str); 31 int start_with(char *str, char *sym); 32 int end_with(char *str, char *sym); 33 char* uniq_seq_repeat_chars(char *str); 34 35 #endif
xstring.c
1 #include <stdlib.h> 2 #include <string.h> 3 #include <ctype.h> 4 #include <assert.h> 5 #include "xstring.h" 6 #include "mem_pool.h" 7 8 void* allocate(size_t size) { 9 #ifdef USE_STD_MALLOC 10 return malloc(size); 11 #else 12 return mem_get(size); 13 #endif 14 } 15 16 xstring* xstring_new(size_t size) { 17 xstring *s = (xstring *)allocate(sizeof(xstring)); 18 if (!s) return NULL; 19 20 s->str = (char *)allocate(size+1); 21 if (!s->str) { 22 dellocate(s); 23 return NULL; 24 } 25 26 s->next = NULL; 27 return s; 28 } 29 30 void xstring_delete(xstring** head) { 31 xstring *curr = *head; 32 xstring *next; 33 34 while(curr) { 35 next = curr->next; 36 if (curr->str) dellocate(curr->str); 37 dellocate(curr); 38 curr = next; 39 } 40 *head = NULL; 41 return; 42 } 43 44 int xstring_size(xstring* head) { 45 int size = 0; 46 while (head) { 47 size++; 48 head = head->next; 49 } 50 return size; 51 } 52 53 static void string_copy(char *dst, char *src, int len) { 54 if (!dst || !src) return; 55 strncpy(dst, src, len); 56 dst[len] = ‘\0‘; 57 return; 58 } 59 60 static void substring_copy(xstring **curr, xstring *next, char *str, int len) { 61 string_copy(next->str, str, len); 62 (*curr)->next = next; 63 (*curr) = (*curr)->next; 64 } 65 66 xstring* split(char* str, char *delimter) { 67 char *delimt, *buffer; 68 int i = 0; 69 int len, match, cnt; 70 xstring *head = NULL; 71 xstring *next, *curr; 72 73 if (NULL == str || NULL == delimter) return NULL; 74 75 delimt = delimter; 76 len = strlen(delimter); 77 buffer = str; 78 match = 0; 79 cnt = 0; 80 81 while (*buffer != ‘\0‘) { 82 if (*buffer == *delimt) { 83 delimt++; 84 match++; 85 } else if (*buffer != *delimt) { 86 delimt = delimter; 87 } 88 89 if (match == len) { 90 if (NULL == head && cnt > 0) { 91 head = xstring_new(cnt); 92 if (!head) return NULL; 93 string_copy(head->str, str+i-cnt, cnt+1-len); 94 curr = head; 95 } else if (cnt > 0){ 96 next = xstring_new(cnt); 97 if (!next) return NULL; 98 substring_copy(&curr, next, str+i-cnt, cnt+1-len); 99 } 100 cnt = 0; 101 match = 0; 102 delimt = delimter; 103 } else { 104 cnt++; 105 } 106 i++; 107 buffer++; 108 } 109 110 if (cnt > 0) { 111 next = xstring_new(cnt); 112 if (!next) return NULL; 113 substring_copy(&curr, next, str+i-cnt, cnt); 114 } 115 return head; 116 } 117 118 size_t count(char* src, char* dst) { 119 size_t cnt = 0; 120 char *buf = src; 121 char *tmp = dst; 122 int sum = 0; 123 size_t len = strlen(dst); 124 125 while (*buf != ‘\0‘) { 126 if (*buf == *tmp) { 127 sum++; 128 tmp++; 129 } else { 130 tmp = dst; 131 sum = 0; 132 } 133 134 if (sum == len) { 135 tmp = dst; 136 sum = 0; 137 cnt++; 138 } 139 buf++; 140 } 141 return cnt; 142 } 143 144 char* replace(char *src, char *old_val, char *new_val) { 145 if (!src || !old_val || !new_val) return NULL; 146 size_t cnt = count(src, old_val); 147 if (0 == cnt) return NULL; 148 149 size_t o_len = strlen(old_val); 150 size_t n_len = strlen(new_val); 151 size_t len = strlen(src) + cnt * (n_len - o_len) + 1; 152 153 char *new_str = (char *)allocate(len); 154 if (!new_str) return NULL; 155 156 char *str = new_str; 157 char *buf = src; 158 char *tmp = old_val; 159 int sum = 0; 160 161 while (*buf != ‘\0‘) { 162 if (*buf == *tmp) { 163 sum++; 164 tmp++; 165 } else if (sum > 0){ 166 tmp = old_val; 167 sum = 0; 168 } 169 170 if (sum == 0) *new_str++ = *buf; 171 if (sum == o_len) { 172 tmp = old_val; 173 sum = 0; 174 for (size_t i=0; i<n_len; i++) *new_str++ = new_val[i]; 175 } 176 buf++; 177 } 178 179 for(; sum>0; sum--) *new_str++ = *(buf-sum); 180 *(str+len-1) = ‘\0‘; 181 182 return str; 183 } 184 185 char* lstrip(char *str) { 186 if (NULL == str) return NULL; 187 188 char *tmp = str; 189 int i = 0; 190 191 while (isspace(*tmp++)) i++; 192 int len = strlen(str) - i; 193 194 char *s = (char *)allocate(len + 1); 195 if (NULL == s) return NULL; 196 197 string_copy(s, str+i, len); 198 return s; 199 } 200 201 char* rstrip(char *str) { 202 if (NULL == str) return NULL; 203 char *tmp = str; 204 int len = strlen(str) - 1; 205 206 while (isspace(*(str+len))) len--; 207 208 char *s = (char *)allocate(len + 2); 209 if (NULL == s) return NULL; 210 211 string_copy(s, str, len+1); 212 return s; 213 } 214 215 char* strip(char *str) { 216 if (NULL == str) return NULL; 217 218 char *tmp = str; 219 int len = strlen(str)-1; 220 int i = 0; 221 222 while(isspace(*tmp++)) i++; 223 while(isspace(*(str+len))) len--; 224 225 char *s = (char *)allocate(len-i+2); 226 if (NULL == s) return NULL; 227 228 string_copy(s, str+i, len-i+1); 229 return s; 230 } 231 232 int start_with(char *str, char *sym) { 233 if (!str || !sym || 0 == strlen(sym)) return -1; 234 return strncmp(str, sym, strlen(sym)); 235 } 236 237 int end_with(char *str, char *sym) { 238 if (!str || !sym) return -1; 239 int l_len = strlen(str); 240 int r_len = strlen(sym); 241 242 if (l_len < r_len ) return -1; 243 return strncmp(str+l_len-r_len, sym, r_len); 244 } 245 246 int max(int *in_arr, int len) { 247 assert(NULL != in_arr); 248 int m = in_arr[0]; 249 for(int i=0; i<len; i++) 250 if (m < in_arr[i]) m = in_arr[i]; 251 return m; 252 } 253 254 char *uniq_seq_repeat_chars(char *str) { 255 if (NULL == str) return NULL; 256 257 int rec[256] = {0}; 258 char *s = (char *)allocate(strlen(str)+1); 259 if (NULL == s) return NULL; 260 char *s1 = s; 261 262 for (int i=0; i<(int)strlen(str); i++) { 263 char ch = str[i]; 264 if (rec[ch] == 0 || 1 != i-rec[ch]) { 265 *s = ch; 266 s++; 267 } 268 rec[ch] = i; 269 } 270 *s = ‘\0‘; 271 return s1; 272 }
时间: 2024-10-06 16:04:14