/**
* @brief get a line from a file pointed at by fp. The line can be extended
* onto the next line if it ends in a backslash (\). If the string is
* extended, the lines will be combined and the backslash will be
* stripped.
*
* @param[in] fp pointer to file to read from
* @param[in, out] pbuf_size - pointer to size of buffer
* @param[in, out] pbuf - pointer to buffer
*
* @return char *
* @retval string read from file
* @retval NULL - EOF or error
* @par MT-Safe: no
*/
char *
pbs_fgets_extend(char **pbuf, int *pbuf_size, FILE *fp)
{
static char *locbuf = NULL;
static int locbuf_size = 0;
char *buf;
char *p;
int len;
if (pbuf == NULL || pbuf_size == NULL || fp == NULL)
return NULL;
if (locbuf == NULL) {
if ((locbuf = malloc(PBS_FGETS_LINE_LEN)) == NULL)
return NULL;
locbuf_size = PBS_FGETS_LINE_LEN;
}
if (*pbuf_size == 0 || *pbuf == NULL) {
if ((*pbuf = malloc(PBS_FGETS_LINE_LEN)) == NULL)
return NULL;
*pbuf_size = PBS_FGETS_LINE_LEN;
}
buf = *pbuf;
locbuf[0] = '\0';
buf[0] = '\0';
while ((p = pbs_fgets(&locbuf, &locbuf_size, fp)) != NULL) {
if (pbs_strcat(pbuf, pbuf_size, locbuf) == NULL)
return NULL;
buf = *pbuf;
len = strlen(buf);
/* we have two options:
* 1) We extend: string ends in a '\' and 0 or more whitespace
* 2) we do not extend: Not #1
* In the case of #1, we want the string to end just before the '\'
* In the case of #2 we want to leave the string alone.
*/
while (len > 0 && isspace(buf[len-1]))
len--;
if (len > 0) {
if (buf[len - 1] != '\\') {
break;
}
else {
buf[len - 1] = '\0'; /* remove the backslash (\) */
}
}
}
/* if we read just EOF */
if (p == NULL && buf[0] == '\0')
return NULL;
return buf;
}
/**
* @brief
* parse_config_line - Read and parse one line of the pbs.conf file
*
* @param[in] fp File pointer to use for reading
* @param[in/out] key Pointer to variable name pointer
* @param[in/out] val Pointer to variable value pointer
*
* @return int
* @retval !NULL Input remains
* @retval NULL End of input
*/
static char *
parse_config_line(FILE *fp, char **key, char **val)
{
char *start;
char *end;
char *split;
char *ret;
*key = '\0';
*val = '\0';
/* Use a do-while rather than a goto. */
do {
int len;
ret = pbs_fgets(&pbs_loadconf_buf, &pbs_loadconf_len, fp);
if (ret == NULL)
break;
len = strlen(pbs_loadconf_buf);
if (len < 1)
break;
/* Advance the start pointer past any whitespace. */
for (start = pbs_loadconf_buf; (*start != '\0') && isspace((int)*start); start++);
/* Is this a comment line. */
if (*start == '#')
break;
/* Remove whitespace from the end. */
for (end = pbs_loadconf_buf + len - 1; (end >= start) && isspace((int)*end); end--)
*end = '\0';
/* Was there nothing but white space? */
if (start >= end)
break;
split = strchr(start, '=');
if (split == NULL)
break;
*key = start;
*split++ = '\0';
*val = split;
} while (0);
return ret;
}