1 #include <u.h> 2 #include <libc.h> 3 #include "String.h" 4 5 /* grow a String's allocation by at least `incr' bytes */ 6 extern String* s_grow(String * s,int incr)7s_grow(String *s, int incr) 8 { 9 char *cp; 10 int size; 11 12 if(s->fixed) 13 sysfatal("s_grow of constant string"); 14 s = s_unique(s); 15 16 /* 17 * take a larger increment to avoid mallocing too often 18 */ 19 size = s->end-s->base; 20 if(size/2 < incr) 21 size += incr; 22 else 23 size += size/2; 24 25 cp = realloc(s->base, size); 26 if (cp == 0) 27 sysfatal("s_grow: %r"); 28 s->ptr = (s->ptr - s->base) + cp; 29 s->end = cp + size; 30 s->base = cp; 31 32 return s; 33 } 34 35