From: Johannes Schindelin Date: Sun, 04 Nov 2007 19:15:22 GMT Subject: [PATCH 2/3] interpolate.[ch]: Add a function to find which interpolations are active. Message-ID: In-Reply-To: Some substitutions require pretty expensive operations. So it make sense to find out which are needed to begin with. Signed-off-by: Johannes Schindelin --- interpolate.c | 20 ++++++++++++++++++++ interpolate.h | 2 ++ 2 files changed, 22 insertions(+), 0 deletions(-) diff --git a/interpolate.c b/interpolate.c index 6ef53f2..80eeb36 100644 --- a/interpolate.c +++ b/interpolate.c @@ -102,3 +102,23 @@ unsigned long interpolate(char *result, unsigned long reslen, *dest = '\0'; return newlen; } + +char *interp_find_active(const char *orig, + const struct interp *interps, int ninterps) +{ + char *result = xcalloc(1, ninterps); + char c; + int i; + + while ((c = *(orig++))) + if (c == '%') + /* Try to match an interpolation string. */ + for (i = 0; i < ninterps; i++) + if (!prefixcmp(orig, interps[i].name + 1)) { + result[i] = 1; + orig += strlen(interps[i].name + 1); + break; + } + + return result; +} diff --git a/interpolate.h b/interpolate.h index 77407e6..2d197c5 100644 --- a/interpolate.h +++ b/interpolate.h @@ -22,5 +22,7 @@ extern void interp_clear_table(struct interp *table, int ninterps); extern unsigned long interpolate(char *result, unsigned long reslen, const char *orig, const struct interp *interps, int ninterps); +extern char *interp_find_active(const char *orig, + const struct interp *interps, int ninterps); #endif /* INTERPOLATE_H */ -- 1.5.3.5.1549.g91a3