If ch == '\0', do not grow the string or advance the length counter,
but do allocate a string if there is none to begin with. This makes it possible to use openpam_straddch(3) to preallocate the string (if necessary) instead of manually calling malloc(3) or calloc(3) and initializing size and len. git-svn-id: svn+ssh://svn.openpam.org/svn/openpam/trunk@634 185d5e19-27fe-0310-9dcf-9bff6b9f3609
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@ -65,7 +65,7 @@ openpam_straddch(char **str, size_t *size, size_t *len, int ch)
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*str = tmpstr;
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*size = tmpsize;
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*len = 0;
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} else if (*len + 1 >= *size) {
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} else if (ch != 0 && *len + 1 >= *size) {
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/* additional space required */
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tmpsize = *size * 2;
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if ((tmpstr = realloc(*str, tmpsize)) == NULL) {
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@ -76,8 +76,10 @@ openpam_straddch(char **str, size_t *size, size_t *len, int ch)
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*size = tmpsize;
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*str = tmpstr;
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}
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(*str)[*len] = ch;
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++*len;
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if (ch != 0) {
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(*str)[*len] = ch;
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++*len;
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}
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(*str)[*len] = '\0';
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return (0);
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}
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@ -94,6 +96,11 @@ openpam_straddch(char **str, size_t *size, size_t *len, int ch)
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* The =size and =len argument point to variables used to hold the size
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* of the buffer and the length of the string it contains, respectively.
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*
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* The final argument, =ch, is the character that should be appended to
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* the string. If =ch is 0, nothing is appended, but a new buffer is
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* still allocated if =str is NULL. This can be used to "bootstrap" the
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* string.
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*
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* If a new buffer is allocated or an existing buffer is reallocated to
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* make room for the additional character, =str and =size are updated
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* accordingly.
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@ -102,7 +109,7 @@ openpam_straddch(char **str, size_t *size, size_t *len, int ch)
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* NUL-terminated.
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*
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* If the =openpam_straddch function is successful, it increments the
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* integer variable pointed to by =len and returns 0.
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* integer variable pointed to by =len (unless =ch was 0) and returns 0.
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* Otherwise, it leaves the variables pointed to by =str, =size and =len
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* unmodified, sets :errno to =ENOMEM and returns -1.
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*
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