189 lines
3.2 KiB
C
189 lines
3.2 KiB
C
#include <assert.h>
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#include <string.h>
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#include <stdlib.h>
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#include "str.h"
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#include "util.h"
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#define INIT_SZ 20
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void
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_str_ensure(str *s, int newsz)
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{
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int tmp;
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newsz += 1;
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if (newsz < s->capacity)
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return;
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tmp = s->capacity * 2;
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if (tmp > newsz) {
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newsz = tmp;
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}
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s->ptr = xrealloc(s->ptr, newsz);
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s->capacity = newsz;
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}
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void
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str_init(str *s)
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{
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assert(s);
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s->len = 0;
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s->capacity = INIT_SZ;
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s->ptr = xmalloc(INIT_SZ);
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s->ptr[0] = '\0';
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}
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void
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str_deinit(str *s)
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{
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if (s->ptr)
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free(s->ptr);
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s->ptr = NULL;
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s->len = 0;
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s->capacity = 0;
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}
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void
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str_init_data(str *s, const char *initial)
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{
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assert(s && initial);
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int len = strlen(initial);
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s->len = len;
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s->capacity = len + 1;
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s->ptr = xmalloc(len + 1);
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strcpy(s->ptr, initial);
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}
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char *
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str_data(str *s)
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{
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assert(s);
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return s->ptr;
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}
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void
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str_set(str *s, char *cstr)
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{
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assert(s && cstr);
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int len = strlen(cstr);
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_str_ensure(s, len);
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strcpy(s->ptr, cstr);
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s->len = len;
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}
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str
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str_copy(str *s)
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{
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assert(s);
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str s2;
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str_init_data(&s2, s->ptr);
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return s2;
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}
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int
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str_count(str *s, char ch)
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{
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assert(s);
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int count = 0;
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for (int i = 0; i < s->len; i++)
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{
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if (s->ptr[i] == ch)
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{count++;}
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}
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return count;
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}
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void
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str_append(str *s, char *cstr)
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{
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assert(s && cstr);
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str_append_n(s, cstr, strlen(cstr));
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}
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void
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str_append_n(str *s, char *cstr, int len)
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{
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assert(s && cstr);
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_str_ensure(s, s->len + len);
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memcpy(s->ptr + s->len, cstr, len);
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s->len += len;
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s->ptr[s->len] = '\0';
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}
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void
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str_shrink(str *s, int len)
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{
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assert(s && len >= 0);
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if (len > s->len)
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{return;}
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s->len = len;
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s->ptr[s->len] = '\0';
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}
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int
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str_find(str *s, char *substr)
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{
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assert(s && substr);
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char *p = strstr(s->ptr, substr);
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if (p == NULL)
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return -1;
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return p - s->ptr;
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}
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str
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str_sub(str *s, int start_idx, int length)
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{
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assert(s && start_idx >= 0 && length >= 0);
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str s2;
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str_init(&s2);
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if (start_idx >= s->len)
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{return s2;}
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int true_length = length;
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if (start_idx + length > s->len)
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{true_length = s->len - start_idx;}
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_str_ensure(&s2, true_length);
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memcpy(s2.ptr, s->ptr + start_idx, true_length);
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s2.len = true_length;
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s2.ptr[true_length] = '\0';
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return s2;
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}
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int
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str_replace(str *s, char *substr, char *replacement)
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{
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assert(s && substr && replacement);
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int count = 0;
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str replaced;
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str_init(&replaced);
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char *current = s->ptr;
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char *found;
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int substr_len = strlen(substr);
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int replacement_len = strlen(replacement);
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while ((found = strstr(current, substr)) != NULL)
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{
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int prefix_len = found - current;
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if (prefix_len > 0)
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{str_append_n(&replaced, current, prefix_len);}
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str_append_n(&replaced, replacement, replacement_len);
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current = found + substr_len;
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count++;
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}
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if (*current != '\0') {
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str_append(&replaced, current);
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}
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str_set(s, replaced.ptr);
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str_deinit(&replaced);
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return count;
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} |