ts_grow.c - plan9port - [fork] Plan 9 from user space
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       ---
       ts_grow.c (563B)
       ---
            1 #include <u.h>
            2 #include <libc.h>
            3 #include "libString.h"
            4 
            5 /* grow a String's allocation by at least `incr' bytes */
            6 extern String*
            7 s_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 }