}
+/* Get next char skipping comments in Netpbm header. Returns -1 at
+ end of input. */
+
+static int
+pbm_next_char (unsigned char **s, unsigned char *end)
+{
+ int c = -1;
+
+ while (*s < end && (c = *(*s)++, c == '#'))
+ {
+ /* Skip to the next line break. */
+ while (*s < end && (c = *(*s)++, c != '\n' && c != '\r'))
+ ;
+
+ c = -1;
+ }
+
+ return c;
+}
+
+
/* Scan a decimal number from *S and return it. Advance *S while
reading the number. END is the end of the string. Value is -1 at
end of input. */
{
int c = 0, val = -1;
- while (*s < end)
- {
- /* Skip white-space. */
- while (*s < end && (c = *(*s)++, c_isspace (c)))
- ;
+ /* Skip white-space. */
+ while ((c = pbm_next_char (s, end)) != -1 && c_isspace (c))
+ ;
- if (c == '#')
- {
- /* Skip comment to end of line. */
- while (*s < end && (c = *(*s)++, c != '\n'))
- ;
- }
- else if (c_isdigit (c))
- {
- /* Read decimal number. */
- val = c - '0';
- while (*s < end && (c = *(*s)++, c_isdigit (c)))
- val = 10 * val + c - '0';
- break;
- }
- else
- break;
+ if (c_isdigit (c))
+ {
+ /* Read decimal number. */
+ val = c - '0';
+ while ((c = pbm_next_char (s, end)) != -1 && c_isdigit (c))
+ val = 10 * val + c - '0';
}
return val;