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/*
* Copyright 2006 Jon Loeliger
*/
#include <string.h>
#include "interpolate.h"
/*
* Convert a NUL-terminated string in buffer orig
* into the supplied buffer, result, whose length is reslen,
* performing substitutions on %-named sub-strings from
* the table, interps, with ninterps entries.
*
* Example interps:
* {
* { "%H", "example.org"},
* { "%port", "123"},
* { "%%", "%"},
* }
*
* Returns 1 on a successful substitution pass that fits in result,
* Returns 0 on a failed or overflowing substitution pass.
*/
int interpolate(char *result, int reslen,
const char *orig,
const struct interp *interps, int ninterps)
{
const char *src = orig;
char *dest = result;
int newlen = 0;
char *name, *value;
int namelen, valuelen;
int i;
char c;
memset(result, 0, reslen);
while ((c = *src) && newlen < reslen - 1) {
if (c == '%') {
/* Try to match an interpolation string. */
for (i = 0; i < ninterps; i++) {
name = interps[i].name;
namelen = strlen(name);
if (strncmp(src, name, namelen) == 0) {
break;
}
}
/* Check for valid interpolation. */
if (i < ninterps) {
value = interps[i].value;
valuelen = strlen(value);
if (newlen + valuelen < reslen - 1) {
/* Substitute. */
strncpy(dest, value, valuelen);
newlen += valuelen;
dest += valuelen;
src += namelen;
} else {
/* Something's not fitting. */
return 0;
}
} else {
/* Skip bogus interpolation. */
*dest++ = *src++;
newlen++;
}
} else {
/* Straight copy one non-interpolation character. */
*dest++ = *src++;
newlen++;
}
}
return newlen < reslen - 1;
}
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