361 lines
7.7 KiB
C
361 lines
7.7 KiB
C
#include "ecore_private.h"
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#include "Ecore.h"
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#include "Ecore_Data.h"
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#include "Ecore_Str.h"
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#define ECORE_STRBUF_INIT_SIZE 32
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#define ECORE_STRBUF_INIT_STEP 32
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#define ECORE_STRBUF_MAX_STEP 4096
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struct _ecore_strbuf
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{
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char *buf;
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size_t len;
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size_t size;
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size_t step;
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};
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static int _ecore_strbuf_resize(Ecore_Strbuf *buf, size_t size);
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/**
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* Create a new string buffer
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*/
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EAPI Ecore_Strbuf *
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ecore_strbuf_new(void)
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{
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Ecore_Strbuf *buf;
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buf = malloc(sizeof(Ecore_Strbuf));
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if (!buf) return NULL;
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buf->len = 0;
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buf->size = ECORE_STRBUF_INIT_SIZE;
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buf->step = ECORE_STRBUF_INIT_STEP;
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buf->buf = malloc(buf->size);
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buf->buf[0] = '\0';
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return buf;
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}
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/**
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* Free a string buffer
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* @param buf the buffer to free
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*/
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EAPI void
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ecore_strbuf_free(Ecore_Strbuf *buf)
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{
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CHECK_PARAM_POINTER("buf", buf);
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free(buf->buf);
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free(buf);
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}
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/**
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* Append a string to a buffer, reallocating as necessary.
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* @param buf the Ecore_Strbuf to append to
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* @param str the string to append
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*/
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EAPI void
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ecore_strbuf_append(Ecore_Strbuf *buf, const char *str)
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{
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size_t l;
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size_t off = 0;
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CHECK_PARAM_POINTER("buf", buf);
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CHECK_PARAM_POINTER("str", str);
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l = ecore_strlcpy(buf->buf + buf->len, str, buf->size - buf->len);
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while (l > buf->size - buf->len)
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{
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/* we successfully appended this much */
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off += buf->size - buf->len - 1;
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buf->len = buf->size - 1;
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buf->size += buf->step;
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if (buf->step < ECORE_STRBUF_MAX_STEP)
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buf->step *= 2;
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buf->buf = realloc(buf->buf, buf->size);
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*(buf->buf + buf->len) = '\0';
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l = ecore_strlcpy(buf->buf + buf->len, str + off, buf->size - buf->len);
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}
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buf->len += l;
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}
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/**
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* Insert a string to a buffer, reallocating as necessary.
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* @param buf the Ecore_Strbuf to insert
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* @param str the string to insert
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* @param pos the position to insert the string
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*/
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EAPI void
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ecore_strbuf_insert(Ecore_Strbuf *buf, const char *str, size_t pos)
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{
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size_t len;
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CHECK_PARAM_POINTER("buf", buf);
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CHECK_PARAM_POINTER("str", str);
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if (pos >= buf->len)
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{
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ecore_strbuf_append(buf, str);
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return;
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}
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/*
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* resize the buffer if necessary
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*/
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len = strlen(str);
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if (!_ecore_strbuf_resize(buf, buf->len + len))
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return;
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/* move the existing text */
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memmove(buf->buf + len + pos, buf->buf + pos, buf->len - pos);
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/* and now insert the given string */
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memcpy(buf->buf + pos, str, len);
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buf->len += len;
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buf->buf[buf->len] = 0;
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}
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/**
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* Append a character to a string buffer, reallocating as necessary.
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* @param buf the Ecore_Strbuf to append to
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* @param c the char to append
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*/
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EAPI void
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ecore_strbuf_append_char(Ecore_Strbuf *buf, char c)
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{
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CHECK_PARAM_POINTER("buf", buf);
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if (buf->len >= buf->size - 1)
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{
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buf->size += buf->step;
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if (buf->step < ECORE_STRBUF_MAX_STEP)
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buf->step *= 2;
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buf->buf = realloc(buf->buf, buf->size);
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}
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buf->buf[(buf->len)++] = c;
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buf->buf[buf->len] = '\0';
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}
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/**
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* Retrieve a pointer to the contents of a string buffer
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* @param buf the buffer
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*
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* This pointer must not be modified, and will no longer be valid if
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* the Ecore_Strbuf is modified.
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*/
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EAPI const char *
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ecore_strbuf_string_get(Ecore_Strbuf *buf)
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{
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CHECK_PARAM_POINTER_RETURN("buf", buf, NULL);
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return buf->buf;
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}
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/**
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* Retrieve the length of the string buffer content
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* @param buf the buffer
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*/
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EAPI size_t
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ecore_strbuf_length_get(Ecore_Strbuf *buf)
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{
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CHECK_PARAM_POINTER_RETURN("buf", buf, 0);
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return buf->len;
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}
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/**
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* Replace the n-th string with an other string.
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* @param buf the Ecore_Strbuf to work with
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* @param str the string to replace
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* @param with the replaceing string
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* @param n the number of the fitting string
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*
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* @return true on success
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*/
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EAPI int
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ecore_strbuf_replace(Ecore_Strbuf *buf, const char *str, const char *with,
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unsigned int n)
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{
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size_t len1, len2;
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char *spos;
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size_t pos;
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CHECK_PARAM_POINTER_RETURN("buf", buf, 0);
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CHECK_PARAM_POINTER_RETURN("str", str, 0);
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CHECK_PARAM_POINTER_RETURN("with", with, 0);
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if (n == 0)
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return 0;
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spos = buf->buf;
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while (n--)
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{
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spos = strstr(spos, str);
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if (!spos || *spos == '\0')
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return 0;
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if (n) spos++;
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}
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pos = spos - buf->buf;
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len1 = strlen(str);
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len2 = strlen(with);
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if (len1 != len2)
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{
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/* resize the buffer if necessary */
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if (!_ecore_strbuf_resize(buf, buf->len - len1 + len2))
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return 0;
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/* move the existing text */
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memmove(buf->buf + pos + len2, buf->buf + pos + len1,
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buf->len - pos - len1);
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}
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/* and now insert the given string */
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memcpy(buf->buf + pos, with, len2);
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buf->len += len2 - len1;
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buf->buf[buf->len] = 0;
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return 1;
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}
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/**
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* Replace all strings with an other string.
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* @param buf the Ecore_Strbuf to work with
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* @param str the string to replace
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* @param with the replaceing string
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*
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* @return how often the string was replaced
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*/
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EAPI int
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ecore_strbuf_replace_all(Ecore_Strbuf *buf, const char *str, const char *with)
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{
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size_t len1, len2, len;
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char *tmp_buf = NULL;
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char *spos;
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size_t pos, start;
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size_t pos_tmp, start_tmp;
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int n = 0;
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CHECK_PARAM_POINTER_RETURN("buf", buf, 0);
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CHECK_PARAM_POINTER_RETURN("str", str, 0);
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CHECK_PARAM_POINTER_RETURN("with", with, 0);
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spos = strstr(buf->buf, str);
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if (!spos || *spos == '\0')
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return 0;
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len1 = strlen(str);
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len2 = strlen(with);
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/* if the size of the two string is equal, it is fairly easy to replace them
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* we don't need to resize the buffer or doing other calculations */
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if (len1 == len2)
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{
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while (spos)
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{
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memcpy(spos, with, len2);
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spos = strstr(spos + len2, str);
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n++;
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}
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return n;
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}
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pos = pos_tmp = spos - buf->buf;
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tmp_buf = buf->buf;
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buf->buf = malloc(buf->size);
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if (!buf->buf)
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{
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buf->buf = tmp_buf;
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return 0;
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}
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start = start_tmp = 0;
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len = buf->len;
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while (spos)
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{
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n++;
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len = (len + len2) - len1;
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/* resize the buffer if necessary */
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if (!_ecore_strbuf_resize(buf, len))
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{
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/* we have to stop replacing here, because we haven't enough
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* memory to go on */
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len = (len + len1) - len2;
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break;
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}
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/* copy the untouched text */
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memcpy(buf->buf + start, tmp_buf + start_tmp, pos - start);
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/* copy the new string */
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memcpy(buf->buf + pos, with, len2);
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/* calculate the next positions */
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start_tmp = pos_tmp + len1;
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start = pos + len2;
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spos = strstr(tmp_buf + start_tmp, str);
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/* this calculations don't make sense if spos == NULL, but the
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* calculated values won't be used, because the loop will stop
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* then */
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pos_tmp = spos - tmp_buf;
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pos = start + pos_tmp - start_tmp;
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}
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/* and now copy the rest of the text */
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memcpy(buf->buf + start, tmp_buf + start_tmp, len - start);
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buf->len = len;
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buf->buf[buf->len] = 0;
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free(tmp_buf);
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return n;
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}
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/**
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* resize the buffer
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* @param buf the buffer to resize
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* @param size the minimum size of the buffer
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*/
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static int
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_ecore_strbuf_resize(Ecore_Strbuf *buf, size_t size)
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{
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char *buffer;
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size_t new_size;
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size_t new_step;
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new_size = buf->size;
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new_step = buf->step;
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/*
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* first we have to determine the new buffer size
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*/
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if (size == buf->size)
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/* nothing to do */
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return 1;
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else if (size > buf->size)
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{
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/* enlarge the buffer */
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while (size > new_size)
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{
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new_size += new_step;
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if (new_step < ECORE_STRBUF_MAX_STEP)
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new_step *= 2;
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}
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}
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else
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{
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/* shrink the buffer */
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/*
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* to be done
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*/
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return 1;
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}
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/* reallocate the buffer to the new size */
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buffer = realloc(buf->buf, new_size);
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if (!buffer)
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return 0;
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buf->buf = buffer;
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buf->size = new_size;
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buf->step = new_step;
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return 1;
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}
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