ref: 1c0427e6dd9da96e6e20410f205a95b30c2ae770
dir: /sys/src/libregexp/regsub.c/
#include <u.h> #include <libc.h> #include <regexp.h> void regsub(char *src, char *dst, int dlen, Resub *match, int msize) { int i; char *ep, c; ep = dst + dlen-1; for(;*src != '\0'; src++) switch(*src) { case '\\': switch(*++src) { case '0': case '1': case '2': case '3': case '4': case '5': case '6': case '7': case '8': case '9': i = *src - '0'; if(match != nil && i < msize && match[i].ep != nil) { c = *match[i].ep; *match[i].ep = '\0'; dst = strecpy(dst, ep+1, match[i].sp); *match[i].ep = c; } break; case '\\': if(dst < ep) *dst++ = '\\'; else goto End; break; case '\0': goto End; default: if(dst < ep) *dst++ = *src; else goto End; break; } break; case '&': if(match != nil && msize > 0 && match[0].sp != nil) { c = *match[0].ep; *match[0].ep = '\0'; dst = strecpy(dst, ep+1, match[0].sp); *match[0].ep = c; } break; default: if(dst < ep) *dst++ = *src; else goto End; break; } End: *dst = '\0'; }